Anesthesia machines · Avance family

GE Healthcare Avance CS2: troubleshooting and error codes

The ServiceForge knowledge base holds 479 documented symptoms for the GE Healthcare Avance CS2, with 659 ranked causes, 850 diagnostic checks with test points and expected values, and 298 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

System not ready for operation patient safety

Equipment damaged, components incorrectly attached, breathing circuit damaged or disconnected, gas supplies not connected, cylinder valves open when pipeline in use, scavenging not properly connected, casters loose, brakes not set, power cord not connected

Ranked causes

1. Equipment is damaged (unknown)
2. Components incorrectly attached (unknown)
3. Breathing circuit damaged or incorrectly connected (unknown)
4. Pipeline gas supplies not connected (unknown)
5. Cylinder valves left open during pipeline use (unknown)
6. Scavenging not connected or adjusted (unknown)
7. Cylinder wrench missing (unknown)
8. Reserve O2 supply not connected (unknown)
9. Casters loose or brakes not set (unknown)
10. Power cord not connected to wall outlet (unknown)

First check

Inspect equipment for damage

Test point: Visual inspection
Expected: No visible damage to equipment structure or components

9 more checks with pass and fail actions, 10 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Inspiratory Flow Valve

Two-stage flow valve calibration to establish pressure-to-flow mapping across the full operating range using calibrated orifice reference

Ranked causes

1. Flow valve DAC counts >= 1000 during Stage 1 points 2-6 (unknown)
2. Leaks around test plugs or manifold (unknown)
3. Inspiratory Flow Valve not closing completely (leaky) (occasional)
4. Drive gas regulator not adjusted or unstable (occasional)
5. Inspiratory Flow Valve not linear (occasional)
6. Flow valve DAC reaches 4095 before Lift-Off Point (Stage 2) (unknown)
7. Inadequate drive gas supply (cannot deliver > 100 l/min) (occasional)

First check

Leave Drive Port (A) and Manifold Port (B) on interface valve plugged

Test point: Vent Engine interface valve ports A and B
Expected: Ports remain sealed

5 more checks with pass and fail actions, 7 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

High pressure leak caution

Gas escaping from high-pressure system components (pipeline, O2 flush valve, system switch, cylinder installation, transducer, gaskets, relief valves).

Ranked causes

1. Pipeline leak (unknown)
2. O2 flush valve defective (unknown)
3. System switch defective (unknown)
4. Cylinder not installed properly (unknown)
5. Cylinder transducer defective (unknown)
6. Cylinder gaskets defective (unknown)
7. Relief valves defective (unknown)

7 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

High pressure leak detected patient safety

Gas escaping from high-pressure system components (pipeline, O2 flush valve, system switch, cylinder connection, transducer, gaskets, or relief valves)

Ranked causes

1. Pipeline leak (unknown)
2. O2 flush valve defect (unknown)
3. System switch defect (unknown)
4. Cylinder not installed properly (unknown)
5. Cylinder transducer defect (unknown)
6. Cylinder gaskets defective (unknown)
7. Relief valves defective (unknown)

First check

Locate source of high pressure leak

Test point: All high-pressure system connections
Expected: No gas escaping when checked with leak detector or Snoop

7 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Breathing system circuit leak suspected patient safety

Low airway pressure during gas delivery setup; inability to maintain adequate breathing circuit pressure

Ranked causes

1. Flow sensor module defective or disconnected (common)
2. Circuit module internal leak or blocked ports (common)
3. Soda lime canister defective or improperly sealed (common)
4. Inspiratory side circuit disconnection or leak (occasional)
5. Negative pressure relief valve stuck open (occasional)
6. Flow sensor connector o-ring or internal tubing leak (occasional)

First check

Verify flow sensor integrity without circuit module

Test point: Flow Sensor connector and housing
Expected: Bulb remains deflated or inflates in more than 30 seconds
Tools: Low-pressure leak test device (bulb)

5 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Bleed Resistor

Bleed resistor calibration to establish pressure-to-flow table for system bleed path characterization

Ranked causes

1. Flow exceeds 50 l/min before 105 cmH2O pressure reached (unknown)
2. Leaks around test plugs (unknown)
3. Drive gas regulator not adjusted or unstable (occasional)
4. Inspiratory Valve Calibration not complete (occasional)
5. Inspiratory Flow Valve not closing completely (leaky) (occasional)
6. Inspiratory Flow Valve not linear (occasional)

First check

Plug Drive Port (A) and Manifold Port (B) on interface valve

Test point: Vent Engine interface valve ports A and B
Expected: Ports sealed with plugs

2 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Leak in Bag Mode patient safety

Full Test - Circuit Leak fails during system checkout. Bellows do not inflate properly or airway pressure cannot be maintained.

Ranked causes

1. Bag/Vent Switch lower seal leaking (common)
2. APL diaphragm leaking (occasional)
3. APL/BTV Manifold O-Ring seal compromised (occasional)
4. Bag port cover or APL valve defective (occasional)
5. Negative Pressure Relief Valve leaking (occasional)

First check

Perform Test 4 - Testing bag port, APL valve, Bag/Vent switch, and negative pressure relief

Test point: Bag port connection
Expected: No pressure loss; bellows inflate when pressurized

1 more check with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Leak in both Bag and Vent Mode patient safety

Full Test fails in both Bag and Vent Mode. Common areas: Flow Sensor Module, Circuit Module, absorbent canister, negative pressure relief, or optional EZchange/Condenser Module.

Ranked causes

1. Flow Sensor Module or bulkhead connector O-ring defective (common)
2. Circuit Module O-ring or seal leaking (common)
3. Absorbent canister leak or improper installation (occasional)
4. Negative Pressure Relief Valve defective (occasional)
5. EZchange/Condenser Module or condenser assembly leaking (occasional)

First check

Perform Test 9 - Testing flow sensor module, circuit module, and absorbent canister

Test point: Circuit interface ports
Expected: No pressure loss; bulb remains collapsed

2 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low pressure leak without vaporizer caution

Gas escaping from low-pressure system without vaporizer or with vaporizer mounted (leaking port valve, mixer, relief valve, flush valve, system switch).

Ranked causes

1. Leaking port valve on vaporizer manifold (unknown)
2. Leak in mixer (unknown)
3. Leaking relief valve on vaporizer manifold (unknown)
4. Leaking flush valve (unknown)
5. Leaking system switch (unknown)

5 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Alternate O2 flowmeter not indicating correct flow patient safety

Flowmeter ball does not rise smoothly, does not maintain steady position, or does not indicate expected flow rate during Alternate O2 flow control operation.

Ranked causes

1. Flow control mechanism stiff or not rotating smoothly (occasional)
2. Flowmeter ball stuck or obstructed (occasional)
3. Alternate O2 flow not activating (occasional)
4. O2 supply pressure insufficient or not connected (occasional)

First check

O2 supply connected and pressure available

Test point: O2 cylinder valve or pipeline inlet
Expected: Cylinder valve fully open or pipeline connected

8 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bellows collapsed patient safety

Unable to drive bellows, manifold pressure exceeds calculated limit

Ranked causes

1. Breathing circuit leak or hose occlusion (common)
2. Drive gas check valve failure (occasional)
3. cVIB cabling issue (occasional)
4. cVIB module failure (occasional)

First check

Inspect breathing circuit

Test point: Breathing circuit hoses and connections
Expected: No leaks, no obstructions

1 more check with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bellows falls during vertical seal test patient safety

Bellows assembly fails to remain inverted when ports are sealed with test plugs, indicating loss of seal integrity or component malfunction

Ranked causes

1. Ports not tightly sealed (common)
2. Bellows incorrectly installed (occasional)
3. Internal bellows seal incorrectly installed (occasional)
4. Parts are damaged (occasional)

First check

Verify test plug seating in all ports

Test point: Bellows assembly ports
Expected: Test plugs fully seated and secure

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bellows falls past guide line during upright position test patient safety

Bellows assembly fails to remain extended to guide line when single port is sealed, indicating seal or pressure-relief valve malfunction

Ranked causes

1. Port not tightly sealed (common)
2. Bellows incorrectly installed (occasional)
3. Pressure-relief valve incorrectly installed (occasional)
4. Parts are damaged (occasional)

First check

Verify test plug seating in upright position port

Test point: Bellows assembly port
Expected: Test plug fully seated and secure

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bellows fill time abnormal

Bellows takes longer or shorter than expected to fill when O2 Flush button is depressed continuously

Ranked causes

1. Large leak in breathing system (common)
2. Flush regulator setting incorrect (common)
3. Flush regulator cross-connection (occasional)
4. SCGO/ACGO selector valve inlet cross-connection (occasional)

First check

Set up test apparatus

Test point: Bag/Vent switch and patient circuit
Expected: Bag/Vent switch in Vent position, patient circuit attached with patient port plugged, bellows completely collapsed

3 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Breathing system leak suspected patient safety

Airway pressure fails to rise or rises below expected threshold during breathing system leak test procedures.

Ranked causes

1. Leak in Bag/Vent Switch (common)
2. APL valve malfunction (common)
3. Bellows module leak or pop-off valve failure (common)
4. Flow sensor module or circuit module leak (common)

First check

Verify airway pressure during controlled test

Test point: Airway Pressure on Gas Delivery Schematic
Expected: ≥ 30 cm H2O, ≥

4 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Check flow sensor patient safety

Measured flow for 6 consecutive mechanical breaths does not meet criteria, or no/negative flow on inspiration/expiration

Ranked causes

1. Flow sensor connection issue (common)
2. Flow sensor calibration needed (common)
3. Inspiratory or expiratory check valve failure (occasional)
4. Flow sensor failure (occasional)

First check

Check flow sensor connection

Test point: Flow sensor connectors and cables
Expected: All connections secure

2 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Excessive fan noise

Fan generates excessive or abnormal noise during operation

Ranked causes

1. Display case fan inlet filter clogged (common)
2. Obstructions within case fan (common)
3. Com Express fan noise (occasional)
4. Defective fan assembly (occasional)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Gas module related errors in logs patient safety

Error log entries indicate issues with the Airway Module gas sampling or sensor functionality

Ranked causes

1. Sample gas line blocked or residue in inlet filter (common)
2. Sample line not connected (occasional)
3. Sensor inoperative (occasional)
4. Module not compatible (rare)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

High intrinsic PEEP during operation patient safety

Elevated positive end-expiratory pressure measured continuously during ventilation in bag or vent modes

Ranked causes

1. APL (adjustable pressure limit) valve sticking or obstruction downstream (common)
2. Exhalation valve or pop-off valve sticking or misassembly (common)
3. Scavenging system problem or breathing circuit obstruction (occasional)
4. Flow control valve malfunction or improper regulator setting (occasional)

First check

Perform flow and pressure sensor calibration

Test point: Calibration software in service application
Expected: Calibration passes

3 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Inaccurate volume ventilation measured patient safety

Set tidal volume does not match measured tidal volume; volume delivery discrepancy

Ranked causes

1. Flow sensor calibration out of range or sensor failure (common)
2. Inspiratory or expiratory check valve leak (occasional)
3. VIB board failure or pneumatic sense tubing leak (occasional)
4. Flow sensor failure or blockage (occasional)

First check

Perform flow and pressure calibration

Test point: PC Service Application calibration module
Expected: Calibration passes

4 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Leak in Vent Mode patient safety

Full Test - Vent and Gas fails during system checkout. Bellows do not fill or exhaust gas cannot be vented properly.

Ranked causes

1. Bellows assembly compromised (common)
2. Bellows pop-off valve leaking (common)
3. Bag/Vent Switch upper seal, disk, or O-ring defective (occasional)
4. Exhalation valve or drive circuit malfunction (rare)

First check

Perform Test 6 - Testing bellows assembly and Bag/Vent switch

Test point: Bellows outlet port
Expected: Bellows fill and empty without pressure loss

2 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

System will not boot from external USB Flash Drive during software installation

System fails to initiate boot process from USB Flash Drive when attempting software installation

Ranked causes

1. USB Flash Drive is incorrect part number or improperly inserted (common)
2. Primary USB port malfunction (occasional)
3. Defective USB Flash Drive (occasional)
4. Carrier Board or Com Express Board Assembly failure (rare)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Touchscreen fails to work

Touchscreen does not respond to touch input or is non-functional

Ranked causes

1. Screen lock is enabled (common)
2. Internal cables or connections disconnected or loose (occasional)
3. Touch Controller Board failure (rare)
4. Touch Bezel Assembly failure (rare)

4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Audible beep not heard during system startup

Expected beep(s) from annunciators (speakers) during power-on sequence are missing or not audible

Ranked causes

1. Power Controller Board annunciator failure (unknown)
2. Anesthesia Control Board annunciator failure (unknown)
3. Display Unit annunciator failure (unknown)

First check

Verify first audible beep heard immediately after System switch turned to On

Test point: System switch
Expected: Audible beep from Power Controller Board

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery not charging

Battery status LEDs (CHG, FLOAT, OVER) not illuminating or batteries remain uncharged

Ranked causes

1. 28 VDC not reaching battery charging circuit (common)
2. Battery charging fuse FH2 or FH3 open (occasional)
3. U-Frame Power Supply not delivering 28 VDC (occasional)

First check

Measure 28 VDC at J6 input

Test point: J6 connector
Expected: 28 VDC
Tools: DMM

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery voltage outside acceptable range caution

Battery test shows voltage below minimum threshold or battery not holding charge

Ranked causes

1. Battery 1 (right) voltage below 12.10 Vdc (occasional)
2. Battery 2 (left) voltage below 12.10 Vdc (occasional)
3. Battery current abnormal or excessive discharge (rare)

First check

Execute Battery test

Test point: AC mains power
Expected: AC mains shut off, wait 2 minutes for results

4 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bellows does not move patient safety

Ventilator bellows assembly does not rise and fall during ventilation attempt

Ranked causes

1. Drive gas regulator output pressure low or absent (common)
2. Gas inlet valve or solenoid failure (occasional)
3. Hospital pressure supply failure or inlet filter blockage (occasional)

First check

Check drive gas regulator output pressure

Test point: Regulator output
Expected: 25 psi

3 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bellows leak caution

Gas escaping from bellows assembly due to pop-off valve diaphragm, mounting rim, or bellows damage.

Ranked causes

1. Pop-off valve diaphragm not sealing properly (unknown)
2. Bellows mounting rim loose (unknown)
3. Bellows improperly mounted or has hole or tear (unknown)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Primary regulators high voltage

Verify output pressure of O2, Air, or N2O primary regulators under low and high flow conditions; regulators must be tested after setup and adjusted if out of specification.

Ranked causes

1. Primary regulator output pressure out of specification at low flow (common)
2. Cylinder supply pressure decays too quickly or does not stabilize (occasional)
3. Primary regulator output pressure drops excessively at high flow (occasional)

First check

Set system to Service mode and access Gas Delivery Schematic

Test point: Service Application (Section 12.3.2)
Expected: System in Service mode; schematic accessible

17 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

cVIB pneumatic sense tubing leak caution

Flow measurements jump or fail to stabilize near zero during pneumatic sense tubing leak test; sensor readings indicate flow when circuit should be sealed

Ranked causes

1. Leak in flow sensor pneumatic circuit (common)
2. Defective flow sensor (occasional)
3. Leak in sense line tubing (occasional)

First check

Set fresh gas flow and vent configuration

Test point: Gas Delivery Schematic, PC Service Application; APL valve; Bag-to-Vent switch
Expected: Fresh gas flow 2 l/min; APL valve 0 cm H2O; Bag-to-Vent switch in Bag/APL position; short tube connected between inspiratory and expiratory flow sensors

6 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Display arm positioning requires adjustment

Display arm movement, side-to-side drift, or tilt position needs calibration to maintain proper positioning and stability

Ranked causes

1. Arm attachment mounting nut loose (common)
2. Display mount attachment nut loose (common)
3. Display clamp assembly clamping screws loose (common)

First check

Position display parallel to arm and apply finger pressure along left side

Test point: Left side of display
Expected: Display does not move

4 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Low pressure leak with vaporizer caution

Gas escaping from low-pressure system with vaporizer mounted (vaporizer installation, o-ring, fill port, port valve, mixer, relief valve, flush valve, system switch, bellows, pop-off valve, bellows mounting, breathing system).

Ranked causes

1. Vaporizer not installed properly (unknown)
2. Missing or damaged o-ring on vaporizer manifold (unknown)
3. Loose fill port (unknown)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Mixer ACB communication failure

Anesthesia control board lost communication with gas mixer module or mixer not responding to commands

Ranked causes

1. Loose or damaged communication cable between ACB and mixer (common)
2. Mixer module not powered or internal failure (occasional)
3. ACB board communication port malfunction (rare)

First check

Check mixer XMT/RCV LED activity

Test point: Mixer board transmission/reception LEDs
Expected: XMT or RCV LED indicates activity; not both absent

2 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

No ventilation delivery patient safety

Ventilator unable to deliver breath; bellows not moving or no fresh gas flow; respiratory gas delivery failure

Ranked causes

1. Drive gas regulator output pressure insufficient or zero (common)
2. No fresh gas flow or blender malfunction (common)
3. Bellows drive system failure or exhalation valve stuck (occasional)

First check

Perform flow/pressure sensor calibration

Test point: PC Service Application sensor calibration
Expected: Calibration passes

4 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Power supply voltage out of range high voltage

Diagnostic menu shows voltage readings outside normal ranges on power boards

Ranked causes

1. Power Controller Board supply fault (common)
2. Anesthesia Control Board power regulation failure (occasional)
3. Display Unit power distribution failure (occasional)

First check

Verify Power Controller Board 12Vdc supply

Test point: Power Diagnostics menu - Power Board section
Expected: 11.70 to 12.30 Vdc, +0.30 / -0.30

24 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Rotary encoder fails to work

Rotary encoder does not respond to rotation or does not function

Ranked causes

1. Rotary encoder cable disconnected or improperly seated (common)
2. Rotary encoder failure (occasional)
3. Carrier Board or Com Express Board Assembly failure (rare)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

System application screen does not appear

Display does not show GE or Datex Ohmeda logo or system interface after power-on

Ranked causes

1. +12V LED not illuminated or power supply failure (common)
2. LCD touch bezel assembly failure (occasional)
3. Compact flash card or memory module failure (occasional)

First check

Check green power indicator LED on dashboard

Test point: Dashboard green LED
Expected: Illuminated

4 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

System Checkout Stage 2 Step 8: Battery and Electrical status patient safety

Check AC/Mains power connection and battery charge status during system checkout

Ranked causes

1. AC/Mains disconnected (unknown)
2. Battery failure (unknown)
3. Battery still charging (unknown)

First check

Verify AC/Mains power connection

Test point: AC/Mains power cord
Expected: Connected and active

1 more check with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Unable to begin mechanical ventilation patient safety

ABS not fully engaged or no O2 supply or defective Bag/Vent switch prevents mechanical ventilation.

Ranked causes

1. ABS not fully engaged (unknown)
2. No O2 supply (unknown)
3. Defective Bag/Vent switch (unknown)

3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Alternate O2 flowmeter not indicating correctly patient safety

Float does not rise smoothly, does not maintain steady position, or indicates outside expected range during functional or accuracy testing

Ranked causes

1. Flowmeter mechanical obstruction or float sticking (common)
2. Flowmeter accuracy drift or calibration error (occasional)

First check

Functional flowmeter response at minimum setting

Test point: Alt O2 flowmeter display
Expected: 0.5 to 0.7 l/min with flow control fully clockwise

6 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

App Not Loaded message is displayed

Display shows App Not Loaded message

Ranked causes

1. Software not loaded (common)
2. Defective CF card (occasional)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary O2 flowmeter accuracy out of specification

Flow test device reading does not fall within acceptable limits for set flowmeter values

Ranked causes

1. Flowmeter calibration drift (common)
2. Test device reading error or incorrect setup (occasional)

First check

Measure flow at 1 L/min setting

Test point: Flow test device outlet
Expected: 0.5 to 1.5 L/min, +0.5 -0.5 L/min
Tools: Flow test device (0–15 L/min, ±2% accuracy)

4 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Balance gas selector valve leaks

Balance Gas Valve Leak test fails indicating selector valve or proportional valve not sealing

Ranked causes

1. Balance gas selector valve seal compromised (occasional)
2. Balance gas proportional valve seal degraded (occasional)

First check

Balance Gas Valve Leak test

Test point: Balance gas selector valve outlet
Expected: Pass (valve holds pressure)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Battery status abnormal caution

Battery voltage out of range, charge state or discharge time unusual

Ranked causes

1. Battery voltage low or high (common)
2. Battery discharge capacity reduced (occasional)

First check

Check Battery 1 voltage reading

Test point: Power Diagnostics menu - Power Board section
Expected: 10.00 to 16.50 Vdc (black display), <10.00 or >16.50 (red display), +3.50 / -3.00

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Bellows does not fill within time specification caution

Flush Flow test shows bellows fill time outside 1.8 to 2.3 second range

Ranked causes

1. Gas supply pressure insufficient (occasional)
2. Flush valve obstruction or malfunction (occasional)

First check

Perform Flush Flow test and time bellows fill

Test point: Bellows fill time
Expected: The bellows fills in 1.8 to 2.3 seconds, 1.8 to 2.3 seconds

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Board temperature excessive caution

Power Controller Board temperature exceeds safe operating limit

Ranked causes

1. Inadequate cooling or fan failure (common)
2. Fan 1 or Fan 2 voltage out of specification (occasional)

First check

Monitor board temperature

Test point: Power Diagnostics menu - Power Board section
Expected: ≤75°C (black); >75°C (red fail), max 75

4 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Breathing system leak caution

Gas escaping from breathing system due to absorber canister or canister o-ring issues.

Ranked causes

1. Absorber canister open or missing (unknown)
2. Damaged or missing canister o-ring (unknown)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Breathing system leak detected patient safety

System or circuit leak alarm triggered; bellows falls or pressure not maintained in breathing circuit

Ranked causes

1. Loose or disconnected breathing circuit connection (common)
2. Leak in bellows base or exhalation valve seal (occasional)

First check

Perform pneumatic sense tubing leak test on VIB

Test point: VIB pneumatic sense tubing
Expected: No leaks; both channels pass

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Manifold P Span

Manifold pressure transducer calibration to set 75 cmH2O reference point using drive gas pressure through inspiratory flow valve adjustment

Ranked causes

1. ADC value outside acceptable range (15740-20250 counts) (unknown)
2. Pressure transducer out of range limits (unknown)

First check

Remove ABS breathing system, exhalation valve, and vent engine cover

Test point: Vent Engine interface valve
Expected: System disassembled and accessible

7 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Paw Span

Patient airway pressure (Paw) transducer calibration to set 75 cmH2O reference point using inspiratory flow valve adjustment with full circuit assembly

Ranked causes

1. ADC value outside acceptable range (21000-27000 counts) (unknown)
2. Pressure transducer outside range limits (unknown)

First check

Leave Drive port (A) plugged

Test point: Vent Engine interface valve Drive port (A)
Expected: Port remains sealed

12 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

CPU LED not illuminated

CPU LED on Power Controller board is off or not flashing, indicates no power or missing Boot Code

Ranked causes

1. No 28 VDC power from U-Frame Power Supply or Battery (common)
2. No Boot Code in Power Controller board (rare)

First check

Measure 28 VDC input voltage

Test point: J6 connector
Expected: 28 VDC
Tools: DMM

1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cylinder high pressure leak detected caution

Pressure decay in cylinder exceeds acceptable limit during one-minute hold test

Ranked causes

1. Cylinder valve seal leaking (occasional)
2. Connection fitting leak (occasional)

First check

Test cylinder #1 for high pressure leaks

Test point: Cylinder #1 pressure gauge
Expected: Pressure decay after one minute is less than 690 kPa (100 psig)

2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cylinder pressure gauge does not indicate patient safety

Pressure gauge fails to show cylinder pressure when cylinder valve is opened

Ranked causes

1. Cylinder valve closed or not fully opened (common)
2. Cylinder empty or low pressure (occasional)

First check

Open each cylinder valve one at a time

Test point: Gas Supply window pressure gauge
Expected: Corresponding gauge indicates cylinder pressure

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Cylinder pressure not displayed

Gas Supply window shows no pressure reading when cylinder valve opened

Ranked causes

1. Cylinder valve not fully open (common)
2. Cylinder empty or pressure insufficient (occasional)

First check

Cylinder valve open

Test point: Gas Supply window
Expected: Corresponding display indicates appropriate cylinder pressure

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Cylinder pressure not indicated on gauge patient safety

Cylinder pressure gauge does not show expected cylinder pressure when valve is opened

Ranked causes

1. Cylinder valve not opened or connection incomplete (common)
2. Cylinder empty or gauge malfunction (occasional)

First check

Open each cylinder valve one at a time

Test point: Cylinder outlet
Expected: Corresponding pressure gauge indicates cylinder pressure

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Display controller board ACB communication failure

Display unit unable to communicate with anesthesia control board; serial link failure

Ranked causes

1. ACB TXD/RXD LED not indicating activity or communication cable damage (occasional)
2. Display memory module or carrier board failure (occasional)

First check

Observe ACB TXD/RXD LED activity

Test point: ACB board transmission/reception LEDs
Expected: Both TXD and RXD LEDs showing activity or one active at a time

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Display unit requires service caution

Fan filter clogged, cable cover loose, or internal components need replacement

Ranked causes

1. Fan filter fouled (common)
2. Cable cover mounting loose (common)

2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI

Drive gas lost patient safety

Ventilator has no drive gas, O2 or Air supply low

Ranked causes

1. O2 supply disconnected or low pressure (common)
2. Air supply disconnected or low pressure (common)

First check

Verify drive gas supply connection and pressure

Test point: O2 or Air supply inlet
Expected: Supply connected, pressure in range

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Fans not running in Standby mode caution

Fans do not turn on when system enters Standby position with AC Mains connected

Ranked causes

1. Power Controller board not receiving 28 VDC from U-Frame Power Supply (common)
2. Fan connector disconnected or failed fan motor (occasional)

First check

Measure 28 VDC at J6 input

Test point: J6 connector on Power Controller board
Expected: 28 VDC from U-Frame Power Supply
Tools: DMM

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FiO2 High alarm does not occur patient safety

FiO2 High alarm fails to trigger when oxygen concentration rises above alarm threshold

Ranked causes

1. FiO2 sensor malfunction or disconnection (unknown)
2. Alarm limit not set to approved clinical values (unknown)

First check

Trigger FiO2 High alarm condition

Test point: Ventilator oxygen delivery system
Expected: FiO2 High alarm occurs

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More symptoms

FiO2 Low alarm does not occur
Free breathing valve flapper damaged or contaminated
Full Test - Circuit Leak check fails
Full Test - Circuit O2 Cell reading unstable or incorrect
Full Test - Vent and Gas check fails
Gas supply system pressure reading incorrect
High current to mixer 10VA
High current to pressure transducers
Machine Check - Circuit: Manual circuit leak test
Machine Check - Circuit: O2 availability and flow test
Mains indicator does not illuminate with power cord connected
Mains power indicator does not illuminate
Mixer command lost during transmission
Mixer gas channel flow failure
MVexp Low alarm does not occur
O2 supply pressure low alarm not triggered
Over Pressure Circuit test failure
PEEP High alarm does not occur
Peripheral circuit supply failure
Pipeline supply not indicating facility pressure
Power failure alarm does not cancel when power cord is plugged back in
Power failure alarm does not display on battery
Power failure alarm does not display when power cord is unplugged
Power failure alarm not displayed or power indicator not active
Ppeak High alarm does not occur
Ppeak Low alarm does not occur
RCV LED constantly on (no communication with Display Unit)
Scavenger receiver replacement or cleaning
Suction gauge does not respond to regulator adjustment
System Checkout Stage 1 Step 2: Low O2 supply pressure
System Checkout Stage 2 Step 2: Ventilator circuit leak detected
System Checkout Stage 2 Step 5: O2 Flow mixer test
System Checkout Stage 2 Step 6: AIR Flow mixer test
System Checkout Stage 2 Step 7: N2O Flow mixer test
Tec 7 vaporizer filler cap leaking or damaged
Zero pressure transducers
+12.0V H AMPS MGAS power issue
+12.0V high current draw on mixer power
+12.0V high current on Alt O2 system
+12.0V high current on gas selection valves
+12.5V supply to ACB failure
AA, CO2 monitoring not connected
ABS inspection and maintenance
AC power inlet filter contamination
AC power inlet filter dirty
ACB clock speed error
ACB CPU test failure
ACB EEPROM failure
ACB flash memory failure
ACB hardware watchdog reset
ACB microprocessor error
ACB RAM error
ACB redundant memory failure
ACB software error
ACB software watchdog failure
ACB unexpected reset
ACGO mode selected - volume and apnea monitoring off
ACGO port flapper valve damaged or worn
ACGO port flapper valve obstruction or debris
ADC reference voltage out of range
ADC timeout failure
AGSS system not in working order
Air pressure low during 21% O2
Air supply pressure low
Airway overpressure signal failure
Airway sensor calibration error
Alarm tests
Alt O2 mode activated without operator action
Alt O2 selection valve failure
Alternate O2 button pressed
Alternate O2 flowmeter accuracy out of range
Alternate O2 flowmeter ball does not maintain steady position
Alternate O2 flowmeter ball does not rise smoothly
Alternate O2 flowmeter calibration and functional verification
Alternate O2 flowmeter does not respond at minimum setting
Alternate O2 flowmeter does not rise smoothly
Alternate O2 flowmeter float does not respond to control rotation
Alternate O2 flowmeter float does not rise
Alternate O2 flowmeter float does not stop at bottom
Alternate O2 flowmeter minimum flow outside spec
Alternate O2 flowmeter not responding to control rotation
Alternate O2 initial flow reading out of range
Alternate O2 outlet blockage not detected
Alternate O2 switch failure
Alternate O2 switch non-responsive
Anesthetic agent delivery during software download
Annunciator beep missing after power-up delay
Annunciator beep missing at System On
Annunciators not functioning at startup
Audible annunciator beep absent or incorrect after power-up
Auxiliary O2 flowmeter accuracy out of range
Auxiliary O2 flowmeter ball does not maintain steady position
Auxiliary O2 flowmeter ball does not maintain steady position at set flow
Auxiliary O2 flowmeter ball does not move at minimum setting
Auxiliary O2 flowmeter ball does not rest at bottom when flow off
Auxiliary O2 flowmeter ball does not rise smoothly
Auxiliary O2 flowmeter ball does not rise smoothly on opening
Auxiliary O2 flowmeter does not shut off
Auxiliary O2 flowmeter float does not maintain steady position
Auxiliary O2 flowmeter float does not move
Auxiliary O2 flowmeter float does not respond after shutdown
Auxiliary O2 flowmeter float does not respond to control
Auxiliary O2 flowmeter float does not return to bottom when fully closed
Auxiliary O2 flowmeter float stuck or does not rise
Auxiliary O2 flowmeter flow does not increase smoothly
Auxiliary O2 flowmeter not responding to control
Auxiliary O2 flowmeter reading outside tolerance
Auxiliary O2 outlet leak detected
Auxiliary O2 outlet occlusion does not stop float
Backup mode activated - apnea detected
Balance channel flow control failure
Balance channel proportional valve leak
Balance gas flow does not meet specification at 10 LPM
Balance gas flow does not meet specification at 3 LPM
Balance proportional valve failure
Balanced gas leak test skipped
Battery charge failure
Battery empty
Battery low
Battery missing
Battery power unavailable during mains failure
Battery reversed connections
Battery voltage failure
Battery voltage low
Battery voltage very low
Bellows assembly does not hold position
Bellows assembly does not hold pressure
Bellows assembly fails inspection
Bellows falls more than 100 ml/min after initial drop
Bellows fill rate test
Bellows fills slowly when O2 Flush button pressed
Bellows fills slowly with O2 Flush button
Bellows leaks excessively
Bellows module and bag vent function test
Breathing system not latched
Bulb inflation time excessive
Cabinet, drawer, or frame parts loose or damaged
Cabinet, frame, or drawer parts loose or damaged
Calibration data failure in EEPROM
Calibration error during airway module calibration
Calibration: Airway module
Calibration: Airway Pressure (Paw) Span
Calibration: breathing circuit pressure test
Calibration: Integrated Suction Regulator
Calibration: Manifold Pressure Span
Calibration: Mixer P Zero
Calibration: O2 Flush Regulator
Calibration: Positive pressure relief valve functional check
Calibration: Scavenger Positive Relief Valve
Calibration: User calibrations and system diagnostics
Calibration: Zero Gas Transducers
Carrier board and Com Express assembly replacement
Carrier board overheat
Case fan speed failure
Caster malfunction or misalignment
Caster operation or brake malfunction
Casters not rolling or locking properly
Change drive gas connection
Check AC Power Inlet filter
Check casters for proper operation and mounting
Check external electrical cabling
Check external tubing, rubber goods, hoses, and pipeline hoses
Check labels for legibility
Check mechanical parts condition and tightness
Circuit Leak test fails
Circuit O2 Cell 100% test fails
Circuit O2 Cell 21% test fails
Circuit O2 Cell test reading instability
Communication error ventilator to ACB
Compatibility failure no version info
Compatibility failure software error
Compatibility incomplete no versions from Vent SIB
Compatibility incomplete no versions received from Vent SIB
Configuration: Drive Gas and Altitude verification
Consolidated Ventilator Interface board replacement
Cooling fan current low failure
CPU fan speed failure
CPU overheat
Cylinder pressure drops excessively
Cylinder pressure test
Cylinder supply high pressure leak
DC commanded AC to failure
DC-DC converter failure with battery in use
DCB procedure communication failure
Display fan filter clogged
Display fan filter contamination
Display Power fuse FH4 open
Display Unit annunciator beeps missing during power-up
Display Unit annunciator beeps missing during startup
Display unit disassembly required
Drive gas configuration mismatch
Drive gas regulator pressure out of specification
Electrical safety testing
Electronic Gas Mixer assembly requires replacement
Expiratory check valve leaking
External electrical cabling damaged or disconnected
External electrical cabling damaged or improperly connected
External tubing or hoses deteriorated or loose
External tubing, hoses, or pipeline deteriorated
Fan filter clogged or missing
Flow and Pressure test fails
Flow and pressure test failure
Flow sensor readings exceed ±10% of reference device
Flow valve current feedback failure
Flows do not drop to zero when O2 supply fails
Full system test required
Gas flows do not drop to zero when O2 supply fails
Gas inlet valve feedback closed state
Gas Inlet Valve Feedback does not read Closed
Gas Inlet Valve Feedback test fails
Gas supply not visible on display
Ground resistance exceeds specification
Ground resistance out of specification
Ground resistance out of tolerance
Hard keys not responding
High airway overpressure signal detected
High current to alternate O2 valve
High current to consolidated ventilator interface board
High current to gas select valves
High current to MGAS 10VA
High current to vent and outlet valves
High pressure cylinder leak test
Incompatible software detected during download
Inspiration flow valve 10VA overcurrent
Inspiratory check valve leaking
Inspiratory port occlusion
Integrated suction regulator calibration
Integrated suction regulator does not reduce to minimum vacuum
Integrated suction regulator gauge does not rise smoothly
Integrated Suction Regulator gauge does not rise with adjustment
Integrated suction regulator gauge exceeds 200 mmHg during test
Integrated suction regulator gauge out of calibration
Integrated Suction Regulator gauge rises when inlet occluded at minimum
Integrated suction regulator pressure exceeds 200 mmHg at minimum setting
Integrated Suction Regulator vacuum exceeds minimum setting
Intermittent breathing system leak
Invalid air pipeline measurement
Keypad assembly replacement
Labels illegible or missing
Labels missing or illegible
Labels not legible
LCD display not functioning
LCD/Touch Bezel assembly replacement
Leakage current exceeds limit
Leakage current exceeds specification
LEDs not illuminating
Loss of gas delivery user settings
Loss of ventilation parameter settings
Low drive gas pressure alarm
Low O2 supply alarm not triggered on disconnect
Low O2 supply alarm occurs when pipelines disconnected
Low P Leak check fails (ACGO)
Low P Leak check fails (SCGO)
Low voltage to alternate O2 valve
Low voltage to cVIB
Low voltage to vent and outlet valves
Low-pressure leak check (ACGO)
Low-pressure leak check (SCGO)
Machine Check - Circuit: Airway pressure too high
Machine Check - Circuit: Alt O2 Flow control test
Machine Check - Circuit: Bag/Vent and ACGO switch verification
Main power failure - system on battery
Mains indicator does not illuminate
Mechanical parts loose or damaged
Memory failure - EEPROM
Minimum alternate O2 flow setting incorrect
Missing second audible beep during power-up
Missing third or fourth audible beep during power-up
Mixed fresh gas selection valve overcurrent
Mixer balance gas check valve leak rate exceeds specification
Mixer balance gas selection failure
Mixer channel zero calibration failure
Mixer channel zero calibration failure due to leak
Mixer CPU test failure
Mixer CRC EEPROM failure
Mixer CRC flash failure
Mixer flow attainment failure balance gas channel
Mixer flow attainment failure channel 1
Mixer flow check failure
Mixer flow inaccurate on air
Mixer flow inaccurate on N2O
Mixer flow inaccurate on O2
Mixer flow sensor failure balance gas channel
Mixer flow sensor failure channel 1
Mixer flow verification failure balance gas channel
Mixer flow verification out of limits
Mixer gas channel flow control failure
Mixer gas channel proportional valve failure
Mixer gas channel selection valve failure
Mixer gas channel temperature limit exceeded
Mixer gas channel temperature sensor malfunction
Mixer outlet check valve leaking
Mixer outlet check valve leaks
Mixer outlet check valve leaks excessively
Mixer outlet flow inaccurate
Mixer POST failure during power-up
Mixer pressure sensor P1/P3 failure
Mixer pressure sensor P2 failure
Mixer RAM failure
Mixer software watchdog failure
Mixer temperature sensor failure balance gas channel
Mixer temperature sensor failure channel 1
Mixer voltage supply failure
MOPV pressure relief valve malfunction
MOPV pressure relief valve not functioning
MOPV pressure relief valve test fails
No AA data
No audible beep after system switch on
No CO2 data or waveform
No flow waveform displayed
No fresh gas flow - aux outlet circuit feedback fault
No measured Vte
No O2 data
No PEEP pressure waveform displayed
Non-Circle SCGO selected
O2 alarm verification with Airway Module
O2 bypass valve leaks
O2 flow does not meet specification at 10 LPM
O2 flow does not meet specification at 3 LPM
O2 Flush button friction or wear
O2 Flush Regulator pressure out of specification
O2 proportional valve leaks
O2 selector valve leaks
O2 sensor not connected
O2 supply alarm does not occur
Over-pressure circuit does not function
Overdue 12-hour power cycle self test
Oxygen cell calibration failure
Oxygen leak test skipped
Pan enclosure fan requires replacement
PEEP high blockage alarm does not occur
PEEP/PCV not available
Pipeline and cylinder pressure test
Pipeline pressure gauge not indicating correctly
Pipeline pressure not displayed
Power Controller communication failure
Power Controller communication failure with internal failure
Power Controller self-test failure
Power failure alarm does not activate
Power failure alarm does not display
Power failure alarm response
Power supply temperature high
Ppeak low leak alarm does not occur
Pressure limit circuit test fails
Pressure relief valve test
Pressure transducer out of specification
Reverse expiratory flow detected
Scavenger positive relief functional check
Scavenger positive relief valve not functional
Second annunciator beep missing during startup
Severe sustained airway pressure
Speaker not producing sound
Standby patient detection failure
Suction control valve not delivering adequate flow
Suction flow rate below minimum
Suction gauge does not bleed to zero on OFF
Suction gauge needle moves with knob in OFF position
Suction gauge needle not at zero when idle
Suction gauge needle not at zero when off
Suction regulation unstable
Suction regulator does not respond to adjustment
Suction regulator pressure exceeds limit during operation
Suction regulator pressure not holding setpoint
Suction regulator vacuum accuracy out of range
Suction regulator vacuum gauge not zeroing
Suction system has vacuum leak with regulator off
Suction system vacuum does not return to zero after shutdown
Suction vacuum gauge reading inaccurate
Sustained high airway pressure
System Checkout Stage 1 Step 1: Bag/Vent Switch incorrect
System Checkout Stage 1 Step 3: Ventilator has no drive gas
System Checkout Stage 2 Step 1: Cannot empty bellows
System Checkout Stage 2 Step 3: Mechanical Ventilation test
System Checkout Stage 2 Step 4: Circuit Compliance test
System date and time incorrect
System flushing with oxygen after leak test
System malfunction - ACB clock speed incorrect
System malfunction - ACB communication failure
System malfunction - ACB CPU test failure
System malfunction - ACB Display Controller communication failure
System malfunction - ACB flash memory CRC failure
System malfunction - ACB hardware watchdog failure
System malfunction - ACB microprocessor exception
System malfunction - ACB procedure communication failure
System malfunction - ACB RAM error
System malfunction - ACB redundant memory failure
System malfunction - ACB software error
System malfunction - ACB software watchdog failure
System malfunction - ACB unexpected reset
System power-on tests failed
Temperature measurement channel 1 high
Temperature measurement channel 2 high
Touch points are misaligned
Touch screen calibration misaligned
Touchscreen failure
Unit does not power on
Vaporizer alarms triggered during back pressure test
Vaporizer back pressure and interlock malfunction
Vaporizer system issues during concentration adjustment
Vent and Gas test fails
Ventilation -6V supply failure
Ventilation +12.5V supply failure
Ventilation +6V supply failure
Ventilation 1.22V supply failure
Ventilation ADC reference voltage failure
Ventilation check stage 1 failed
Ventilation check stage 2 failed
Ventilation flow valve DAC feedback failure
Ventilation valve 10VA power supply failure
Ventilator free breathing valve requires maintenance
Ventilator interface board 10VA overcurrent
Ventilator interface board communication failure
Verify and reset Altitude setting
Verify and reset Drive Gas setting
Verify audible beeps during power-up
Visual inspection of display fan filter
Voltage out of range to ACB
Zero calibration: Gas transducers
Zero calibration: Mixer Pressure

419 more symptoms with ranked causes and checks are in ServiceForge. Connect ServiceForge to your AI

Error codes

Code	Meaning	Trigger	Severity
`+12.0V H AMPS ALT O2`	High current to alternate O2 valve detected	Alternate O2 valve +10VA turned on	warning
`+12.0V H AMPS ALT O2`	Alternate oxygen system +12V overcurrent; excessive current drawn	+12V supply to Alt O2 circuit drops due to overcurrent	error
`+12.0V H AMPS GAS SEL VALVES`	High current to gas select valves detected	Fresh gas select valves +10VA is turned on	warning
`+12.0V H AMPS GAS SEL VALVES`	Gas selection valve circuits drawing excessive current; overcurrent condition	+12V supply to gas selection solenoids drops due to overcurrent	error
`+12.0V H AMPS MGAS`	High current to MGAS 10VA detected; gas monitoring not available	MGAS 10VA turned on after 3 consecutive ACB MGAS error log messages	warning
`+12.0V H AMPS MGAS`	High current condition on +12V Airway Module power rail	Power supply detects excessive current draw from Airway Module	critical
`+12.0V H AMPS MIXER`	Mixer +12V power supply overcurrent condition; excessive current detected	+12V supply voltage drops or overcurrent protection activates	critical
`+12.0V H AMPS MIXER`	High current to mixer 10VA supply detected	Mixer +10VA turned on	warning
`+12.0V H AMPS VENT&OUTLET VALVES`	High current to vent and outlet valves 10VA detected	Ventilator valves +10VA is on	warning
`+12.0V H AMPS VENTSIB`	High current to consolidated ventilator interface board 10VA detected	cVIB 10VA is turned on	error
`+12.0V L VOLT ALT O2`	Low voltage to mixer alternate O2 valve detected	ACB detects low voltage condition	warning
`+12.0V L VOLT GAS SEL VALVES`	Gas selection valve circuits receiving low +12V supply; voltage below acceptable range	Gas selection solenoid supply voltage below minimum threshold	error
`+12.0V L VOLT VENT&OUTLET VALVES`	Low voltage to vent and outlet valves detected	GIV or inspiratory flow valve drawing excess power	warning
`+12.0V L VOLT VENTSIB`	Low voltage to cVIB detected	ACB detects low voltage condition to cVIB	warning
`+12.5V TO ACB`	Power controller board unable to supply +12.5V to anesthesia control board	ACB power supply voltage below specification; power delivery failure	error
`+12.5V TO ACB`	Voltage to ACB out of specification range	Power supply voltage less than 11.9 or greater than 12.9 Vdc	error
`12 HR TEST`	System power-up self test overdue	System has been operating longer than 12 hours without power cycle	info
`+5V H AMP GAS SUPPLY XDUCERS`	High current to pressure transducers detected; cannot read gas supply pressures	Pressure transducer +10VA turned on	warning
`AA, CO2 MONITORING NOT CONNECTED`	Anesthetic agent or CO2 monitoring module not detected	System unable to communicate with monitoring module at startup or during operation	error
`ACB 4.096V ADC REF`	ADC reference voltage out of specification; cannot monitor gas supplies	Reference voltage less than 4.018 or greater than 4.176 Vdc	info
`ACB ADC FAIL`	ADC timeout detected; cannot monitor gas supplies	ADC timeout on any MUX channel	info
`ACB CLOCK SPEED`	AC clock frequency incorrect; system malfunction	Clock frequency greater than 1.1× expected or less than 0.9× expected	error
`ACB CLOCK SPEED`	Anesthesia control board clock speed out of specification; timing error detected	CPU clock frequency measurement outside normal range during self-test	error
`ACB COM FAIL`	System malfunction; display controller not receiving messages from anesthesia computer	DC does not receive messages from AC for 10 seconds after initial communication established	error
`ACB COM FAIL`	ACB communication failure	Loss of communication with ACB	critical
`ACB CPU TEST FAIL`	Anesthesia control board CPU self-test failed; processor malfunction	CPU built-in self-test (BIST) detects processor fault during startup	error
`ACB DCB COM FAIL`	System malfunction; anesthesia computer not receiving system state messages from display controller	AC receives no system state messages from DC for 10 seconds after initial communication established	error
`ACB DCB COM FAIL`	ACB-DCB communication failure	Loss of communication between ACB and DCB	critical
`ACB EEPROM FAIL`	Anesthesia control board EEPROM memory failure; data storage error	EEPROM read/write test failed; memory chip unresponsive	error
`ACB EEPROM FAIL`	Memory failure; EEPROM read/write or CRC failure on anesthesia control board	EEPROM read/write failure or CRC failure	info
`ACB FLASH FAIL`	System malfunction; CRC failure in ACB code space	CRC failure detected in flash memory code space	error
`ACB FLASH FAIL`	Anesthesia control board flash memory failure; program storage error	Flash memory read test failed; program code unreadable	error
`ACB HW WATCHDOG`	ACB hardware watchdog timeout	Watchdog timer expired, system hung	critical
`ACB HW WATCHDOG`	ACB hardware watchdog circuit triggered reset; system lockup or hang occurred	ACB processor did not reset watchdog timer before timeout	error
`ACB MICROPROC ERROR`	System malfunction; unexpected microcontroller exception	Bus error, address error, or other microcontroller exception	error
`ACB MICROPROC ERROR`	Anesthesia control board microprocessor error; CPU fault detected	Processor exception or fault condition during operation	error
`ACB PROCEDURE COM FAIL`	System malfunction; anesthesia computer not receiving procedure messages from display controller	DC receives no procedure messages from AC for 15±1 seconds, or procedure message mismatch for 15±1 seconds	error
`ACB RAM ERROR`	System malfunction; memory test failure with multiple bit errors	Multiple bit errors detected during RAM test	error
`ACB RAM ERROR`	ACB RAM memory error	RAM test failure or memory parity error	critical
`ACB RAM ERROR`	Anesthesia control board RAM memory failure; read/write error detected	RAM memory self-test failed; memory chip unresponsive	error
`ACB REDUNDANT MEMORY FAIL`	ACB redundant memory verification failed; data mismatch detected	Redundant memory copies do not match; data integrity check failed	error
`ACB REDUNDANT MEMORY FAIL`	System malfunction; redundantly stored parameter corrupted or not stored	Redundant parameter storage or retrieval failure	error
`ACB SW ERROR`	System malfunction; unexpected software error	Software error detected during execution	error
`ACB SW ERROR`	Anesthesia control board software execution error; firmware fault	Software exception or illegal instruction execution detected	error
`ACB SW WATCHDOG`	ACB software watchdog timer triggered; processor hang or deadlock detected	Software watchdog timer expired; ACB firmware did not reset watchdog	error
`ACB UNEXPECTED RESET`	System malfunction; unexpected reset of anesthesia control board	Unexpected reset event detected	error
`ACB UNEXPECTED RESET`	Anesthesia control board experienced unexpected reset; no watchdog trigger	Reset detected without hardware or software watchdog being triggered	warning
`ACGO`	Volume and apnea monitoring off; non-circle mode selected	Non-circle (ACGO) mode selected in system configuration	info
`ACMains POWER FAIL`	Plug in power cable; system on battery	ACMains_GOOD goes low and stays low for at least 300 msec	warning
`AIR PIPE INVALID`	Cannot monitor air pipeline; invalid air pipeline pressure reading	Air pipeline pressure measurement invalid	warning
`AIR PRESS LOW`	Air supply pressure low	Air pipeline pressure less than 252 kPa and air cylinder pressure less than 2633 kPa for 1 second	warning
`AIR PRESS LOW DURING 21% O2`	Air pressure low; increase O2 percentage	Air pipeline pressure less than 252 kPa and air cylinder pressure less than 2633 kPa during 21% O2 mode	error
`AIRWAY SENSOR CAL ERROR`	Calibrate flow sensors; airway pressure sensor zero offset out of range	Airway pressure sensor zero offset out of specified range	info
`ALT O2 BUTTON PRESSED`	Alternate O2 button is selected; alternate O2 screen displayed	Alternate O2 button selected by operator	info
`ALT O2 SEL VALVE FAILURE`	Alternate oxygen selection valve malfunction; unable to select Alt O2 source	Alt O2 selector solenoid unresponsive; valve does not switch	error
`ALT O2 SWITCH FAIL`	Alternate O2 switch status indicates fault condition	Alternate O2 switch fault condition persists for 1 second	warning
`Anesthesia Control Board`	Communications status of Anesthesia Control Board	System checks communication link during Tools — Communication Status	unknown
`APNEA`	No breathing detected for specified time interval; patient not breathing	Respiratory rate drops below configured apnea threshold or time exceeds limit	critical
`APNEA > 120s`	Apnea condition detected for longer than 120 seconds; prolonged no breathing	No breathing detected for more than 120 seconds during operation	critical
`App Not Loaded`	Application failed to load on display	Software not loaded or CF card defect	warning
`AUX OUTLET FAIL`	No fresh gas flow; auxiliary outlet circuit feedback fault	Measured SCGO position does not match commanded position	error
`BACKUP MODE ENTERED`	Backup mode active; apnea detected	No spontaneous breaths for set apnea time and 30 seconds elapsed in PSVPro mode	info
`BAL CHANNEL PROP VALVE LEAK FAIL`	Balance proportional valve leak detected; alternate O2 screen displayed	Mixer detects proportional valve leak on balance channel	warning
`BAL FLOW CTRL FAIL`	Balance channel flow control failure	Mixer status bit STS_FLOW_CTRL_CH2_FAIL indicates flow attainment failure	warning
`BAL PROP VALVE FAIL`	Balance channel proportional valve failure (overcurrent, etc.)	Mixer status bit STS_CH2_PROPN VALVE FAIL indicates valve failure	warning
`BATTERY CHARGE FAIL`	No battery backup, battery charge current excessive	System in standby with charge current >4.0 A or powered on with battery current >1.7 A	warning
`BATTERY EMPTY`	Battery empty, system shutdown in less than 5 minutes	Available battery power between 1 and 5 minutes	error
`BATTERY FAIL`	No battery backup, battery voltage or charging anomaly detected	Battery voltage <10.5 V or voltage >16.5 V during bulk/over charging, or excessive bulk charging time	warning
`BATTERY LOW`	Battery low, plug in power cable	Available battery power between 20 and 30 minutes	warning
`BATTERY MISSING`	No battery backup, battery not connected	Battery voltage reading between ±1.0 VDC	warning
`BATTERY REVERSED CONNECTIONS`	No battery backup, battery connected with reversed polarity	Battery voltage reading less than –1.0 VDC	warning
`Battery test FAILED`	One or both battery voltages are below minimum threshold or battery test did not complete	Battery 1 (right) <12.10 Vdc OR Battery 2 (left) <12.10 Vdc	error
`BATTERY V LOW`	Battery voltage low, plug in power cable	Available battery power between 10 and 20 minutes	warning
`BATT V VERY LOW`	Battery voltage very low, plug in power cable	Available battery power decreases to between 10 and 5 minutes	warning
`BELLOWS COLLAPSED`	Unable to drive bellows	Manifold pressure exceeds Paw + 10 + [0.25*(Insp valve flow)]	info
`Breathing system loose`	Breathing circuit connection loose or partially disconnected during operation	Leak detected in breathing circuit connections; pressure drop in circuit	error
`BREATHING SYSTEM NOT LATCHED`	Breathing system loose or not properly latched	Breathing system detection switch indicates system not latched	info
`CAL DATA FAILURE IN EEPROM`	Service calibration advised due to corrupt calibration data	Default calibration data in use due to corrupt data in calibration region	info
`Calibrate flow sensors`	Flow sensor calibration is due or required; sensor accuracy uncertain	Calibration interval exceeded or sensor reading inconsistent during checkout	warning
`CARRIER BOARD OVERHEAT`	Cooling fans may overheat due to high Display Unit temperature	Display Unit thermistors exceed 60 °C	warning
`CASE FAN SPEED FAIL`	Cooling fans may overheat due to case fan speed failure	Case fan speed less than 800 RPM (50% of normal speed)	warning
`CHECK FLOW SENSOR`	Flow sensor reading out of range during mechanical ventilation	Measured flow for 6 consecutive breaths does not meet criteria, or no/negative flow on inspiration/expiration	warning
`Check flow sensors`	Flow sensor diagnostic test failed; sensor not responding within specification	Flow sensor malfunction detected during system checkout or operation	warning
`Circuit check failed`	System checkout failure detected	Message or failure displayed during system checkout	unknown
`Circuit Leak`	Air leak detected in anesthesia breathing circuit; loss of pressurization	Pressure or flow imbalance detected in inspiration vs. expiration	error
`Circuit O2 check skipped`	O2 circuit check not performed during system checkout	Message displayed during system checkout	unknown
`COM ERROR VENT TO ACB`	System malfunction, communication lost between ventilator and ACB	Ventilator boundary object receives no messages from cVIB CPU for 35 milliseconds	error
`Compatibility failure: No version info in file for subsystem`	Subsystem did not report compatibility information	Subsystem version information missing from file	unknown
`Compatibility failure: Software Error`	Subsystem did not report compatibility information	Software error preventing subsystem from reporting version	unknown
`Compatibility incomplete: No versions from Vent SIB`	Consolidated Ventilator Interface Board compatibility information incomplete	cVIB compatibility info does not match or GIV test failed	unknown
`Compatibility incomplete: No versions received from Vent SIB`	Consolidated Ventilator Interface Board compatibility information not received	cVIB compatibility info does not match or GIV test failed	unknown
`Controls (Front Panel) Board`	Communications status of Controls (Front Panel) Board	System checks communication link during Tools — Communication Status	unknown
`COOLING FAN CURRENT LOW FAILURE`	Mixer Pan Fan drawing too little current	Mixer Pan Fan current below normal threshold	warning
`CPU FAN SPEED FAIL`	Cooling fans failed, CPU may overheat	CPU fan speed less than 50% of nominal speed	warning
`CPU OVERHEAT`	Cooling fans may overheat due to high CPU temperature	Display Unit thermistor temperature reading >70 °C	warning
`DCB PROCEDURE COM FAIL`	System malfunction, procedure communication failure between computers	No procedure messages from Display Computer for >15 seconds or message mismatch for >15 seconds	error
`DC COMMANDED AC TO FAILURE`	Display Controller detected issues and commanded safe state	Display Controller initiated safe state transition	unknown
`DRIVE GAS LOST`	Ventilator has no drive gas	O2 or Air supply low or disconnected during mechanical ventilation	error
`EC 06`	System Malfunction	Self test failure or multi bit error detected	critical
`EC 06`	Error code 06	Condition triggering EC 06	error
`ERROR!! INCOMPATIBLE SOFTWARE.`	Software version on USB Media is not compatible with installed subsystem	Software Download detects incompatible subsystem during download process	error
`***ERROR: No bootable device available.`	No valid bootable device found during startup	System startup cannot locate bootable operating system	critical
`***ERROR: Program load failed - CRC.`	Software file checksum error detected during load	System startup detects CRC mismatch in program file	error
`***ERROR: RAM memory error.`	Random access memory hardware failure detected	System startup POST detects RAM failure	critical
`***ERROR: System reset: ECxx xx xx . . .`	System reset due to software or boot failure with error code	System detects software fault or boot failure during startup	error
`***ERROR: System reset: FFFF FF FF`	System reset due to critical battery or power failure	System startup detects Carrier board battery contact loss or below voltage	critical
`***ERROR: watchdog circuit failed.`	Watchdog timer circuit hardware failure	System startup POST detects watchdog circuit malfunction	critical
`EXP FLOW SENSOR CAL ERROR`	Calibrate flow sensors	Exp Flow Sensor zero offset out of range	warning
`EXP FLOW SENSOR EEPROM FAILURE`	Replace exp flow sensor	EEPROM cal data read failure	warning
`FAN FAIL`	Cooling fan needs service. System OK	Fan Power Status Bit is Low (FAN1_GOOD)	warning
`FiO2 High`	Oxygen fraction above acceptable level	Oxygen delivery or measurement exceeds maximum threshold	warning
`FiO2 Low`	Oxygen fraction below acceptable level	Oxygen delivery or measurement falls below minimum threshold	warning
`Flow Attain Fail Bal Gas Channel`	Unable to achieve commanded flow on balance gas channel; flow control failed	Balance gas flow unable to reach setpoint despite proportional valve movement	error
`Flow Attain Fail Bal Gas Channel`	Flow attainment failure on balance gas channel	Unable to attain set flow on balance gas	error
`Flow Attainment Failure Ch1`	Flow attainment failure on channel 1	Channel 1 unable to attain set flow	error
`Flow Attainment Failure Ch1`	O2 flow mismatch	Commanded flow through O2 Gas channel does not match measured flow via sensor and transducers	error
`Flow Attainment Failure Ch1`	Unable to achieve commanded flow on channel 1; flow control failed	Channel 1 flow unable to reach setpoint despite proportional valve adjustment	error
`FLOW SENSOR CAL ERROR`	Calibrate flow sensors	Insp or Exp flow sensor or airway or manifold pressure sensor zero offset out of range	warning
`Flow Sensor Fail Balance Gas Ch`	Flow sensor for balance gas channel failed; sensor not responding	Balance gas flow sensor malfunction detected during system check	error
`Flow Sensor Failure Ch1`	Flow sensor for channel 1 (primary gas) failed; sensor not responding	Channel 1 flow sensor malfunction detected during system check	error
`Flow Sensor Failure Ch1`	Flow sensor failure on channel 1	Channel 1 flow sensor malfunction	error
`FLOW VALVE CURRENT FAILURE`	Insp Flow Valve current feedback incorrect	Current feedback from Insp Flow Valve incorrect for seven consecutive readings	error
`FLOW VALVE DAC FAILURE`	Insp Flow Valve DAC failure	Current feedback from Insp Flow Valve incorrect for seven consecutive readings	error
`Flow Verif Fail (dP) Bal Gas Ch`	Balance gas flow verification failed; differential pressure reading incorrect	Mixer unable to verify balance gas flow using differential pressure method	error
`Flow Verification Failure (dP) Ch1`	O2 pressure transducer mismatch	Commanded O2 flow and Hot-wire anemometer agree but pressure transducers do not agree	error
`FRONT PANEL COM FAIL`	Display panel controls failure	Key pad controller fails to send 'life tick' for greater than 10 seconds	warning
`FRONT PANEL KEY STUCK`	Stuck Keypad or encoder on Display	Stuck Keypad or encoder detected	warning
`GAS INLET VALVE BOOT UP TEST FAIL`	Vent Fail. Monitoring Only	Boot-up test failed	critical
`Gas Module`	Communications status of Gas Module	System checks communication link during Tools — Communication Status	unknown
`INSP FLOW SENSOR CAL ERROR`	Calibrate flow sensors	Insp Flow Sensor zero offset out of range	warning
`INSP FLOW SENSOR EEPROM FAILURE`	Replace insp flow sensor	EEPROM cal data read failure	warning
`Inspiration Stopped`	Inspiratory phase unexpectedly terminated; ventilation cycle incomplete	Flow or pressure signal lost during inspiration; control system error	error
`Link Status`	Overall communication link status	System checks communication during Tools — Communication Status	unknown
`LOSS OF GAS DELIVERY USER SETTINGS`	Loss of gas delivery user settings	User settings lost or corrupted	warning
`LOSS OF GAS DELIVERY USER SETTINGS`	Gas delivery user settings lost; saved parameters not recovered after reset	System restart or error recovery; settings not found in ACB memory	warning
`LOSS OF GAS DELIVERY USER SETTINGS / LOSS OF VENT PARAMETER`	Vent Fail. Monitoring Only	Gas Delivery User Setting or Ventilator Parameter Settings from Display Computer arrived more than 10 seconds ago	critical
`LOSS OF VENT DELIVERY USER SETTINGS`	Ventilation delivery user settings lost; saved parameters not recovered after reset	System restart or error recovery; ventilation settings not found in ACB memory	warning
`LOSS OF VENT PARAMETER SETTINGS`	Loss of ventilation parameter settings	Vent parameters lost or corrupted	warning
`Low O2 supply alarm`	Oxygen supply pressure below operational threshold	Pipeline supplies disconnected and all cylinder valves closed	warning
`Low Pressure Leak check failed`	System Checkout Failed	Low Pressure Leak section of System Checkout Failed	warning
`Low Pressure Leak check fails`	Leak measured greater than 50 ml/min	Leak measured is greater than 50 ml/min during Low Pressure Leak Check with SCGO	warning
`MANIFOLD PAW SENSOR FAIL`	Vent Fail. Monitoring Only	Calibration failure at bootup	warning
`MANIFOLD PRESSURE SENSR FAILURE`	Calibration failure at bootup	Manifold pressure sensor calibration failure at bootup	warning
`MANIFOLD SENSOR CAL ERROR`	Manifold Pressure zero failed	Manifold Pressure zero calibration failure	warning
`MGAS CHECK SAMPLE GAS OUT >20 SEC`	Sample gas check line taking longer than 20 seconds to respond	Airway Module unable to verify sample gas delivery within expected time	warning
`MGAS CHECK SAMPLE GAS OUT >20 SEC`	Check sample gas out	MGAS continuous occlusion bit set for 20 seconds	warning
`MGAS INLET FILTER RESIDUE >40 SEC`	Replace D-Fend	MGAS communicates Replace Trap alarm bit for 40 seconds	warning
`MGAS INLET FILTER RESIDUE >40 SEC`	Inlet filter residue check taking longer than 40 seconds	Excessive residue detected in Airway Module inlet filter	warning
`MGAS LINE BLOCKED >20 SEC`	Gas sample line is blocked	Airway Module detects blockage in gas sampling line	error
`MGas module removed`	Airway Module has been physically removed from system	System detects Airway Module is no longer present	warning
`MGAS SAMPLE FLOW DEVIATION`	Low gas sample flow	Sample flow less than 80% of nominal for 20 consecutive seconds	warning
`MGAS SAMPLE LINE NOT CONNECTED >40 S`	Sample line not connected or connection lost	Airway Module unable to detect sample line connection after 40 seconds	warning
`MGAS SAMPLE LINE NOT CONNECTED >40 S`	Check D-Fend	MGAS communicates OpenGasCircuit alarm for 40 seconds	warning
`MGAS SENSOR INOP > XX`	Airway Module sensor is inoperative	Sensor malfunction detected during system check	error
`MGAS SENSOR INOP > XX`	Module fail. No CO2, AA, O2 data	MGAS communicates hardware failure or UPI does not initialize	warning
`MIXER ACB COM FAIL`	Mixer unable to communicate with anesthesia control board; serial link failure	ACB sends command to mixer but receives no response; timeout occurs	error
`MIXER ACB COM FAIL`	Alternate O2 Screen	Five seconds pass without measured flow data from mixer	warning
`MIXER ACB COM FAILLLOST CMD`	Alternate O2 Screen	Mixer lost AC flow commands for 5 seconds or received illegal commands	warning
`MIXER ACB COM FAIL LOST CMD`	Mixer communication lost during command transmission; packet loss or corruption	Mixer command transmission started but not completed; link interruption	error
`MIXER AIR SELECTION VLV FAIL`	Alternate O2 Screen	Air selector valve status does not match commanded state	warning
`MIXER BAL GAS CHANGE FAIL`	Balance gas selection failure; mixer unable to switch balance gas channel	Mixer selection valve unable to change balance gas source	error
`MIXER BAL GAS CHANGE FAIL`	Alternate O2 Screen	After balance gas change command, selector valve shows old balance gas still connected	warning
`MIXER BAL GAS CHANGE FAIL`	Mixer balance gas change failure	Unable to change balance gas setting	error
`MIXER BAL GAS FLOW CHECK FAIL`	Mixer status bit	Balance gas proportional valve fails flow check	warning
`MIXER BALGAS Flow FAIL`	Mixer error bit	Pressure difference between P3 and P2 differs from expected at measured flow for channel 2	warning
`MIXER BAL GAS F SENSOR FAIL`	Alternate O2 Screen	Balance gas flow sensor failure	warning
`MIXER BAL GAS TEMP LIMIT`	Mixer error bit	Balance gas temperature exceeds 50 °C	warning
`MIXER BAL GAS TSENSOR FAIL`	Mixer error bit	Balance gas temperature sensor failure	warning
`MIXER BAL GAS ZERO FAILLLEAK`	Mixer status bit	Balance gas proportional valve fails zero flow check, shows flow while closed	warning
`Mixer Board`	Communications status of Mixer Board	System checks communication link during Tools — Communication Status	unknown
`MIXER CPU TEST FAIL`	Mixer CPU self-test failed during startup; processor malfunction	Mixer processor self-test detects CPU defect during POST	error
`MIXER CPU TEST FAIL`	Alternate O2 Screen	Mixer CPU test failure	warning
`MIXER CRC EEPROM FAIL`	Mixer EEPROM checksum error; data integrity check failed	EEPROM CRC calculation does not match stored checksum	error
`MIXER CRC FLASH FAIL`	Mixer flash memory checksum error; program code integrity check failed	Flash memory CRC calculation does not match stored checksum	error
`MIXER N2O SELECTION VLV FAIL`	N2O selector valve status does not match commanded state	Mixer Status Bit STS_SELV_VN2O_NOTIFY_FAIL	error
`MIXER O2 FLOW CHECK FAIL`	O2 proportional valve fails flow check	Mixer status bit STS_FLOW_TEST_CH1_FAIL1 LPM_FLOW_TEST_FAIL	error
`MIXER O2 Flow FAIL`	Alternate O2 Screen	Pressure difference differs from expected at measured flow for Channel 1 (O2)	warning
`MIXER O2 F SENSOR FAIL`	O2 flow sensor failure	Mixer error bit STS_F2F1_SENSOR_FAIL (O2)	error
`MIXER O2 SELECTION VLV FAIL`	O2 selector valve status does not match commanded state	Mixer Status Bit STS_SELV_VOXY_NOTIFY_FAIL	error
`MIXER O2 TEMP LIMIT`	O2 temperature exceeds 50 °C	Mixer error bit STS_CH1_TEMP_LIMIT (O2)	error
`MIXER O2 TSENSOR FAIL`	O2 temperature sensor failure	Mixer error bit STS_T1_SENSOR_FAIL	error
`MIXER O2 ZERO LEAK FAIL`	O2 proportional valve fails zero flow checks for leaks	Mixer status bit STS_CH1_ZERO_FLOW_TESP ROPN_V_LEAK_FAILT_FAIL	error
`MIXER POST FAIL`	Mixer power-on self-test (POST) failed during system startup	Mixer initialization test failed during system boot sequence	error
`MIXER PRES SENSOR P1P3 FAIL`	Mixer pressure sensor P1/P3 malfunction; one or both sensors not responding	Pressure sensor P1 or P3 returns invalid or out-of-range reading	error
`MIXER P SENSOR P2 FAIL`	Mixer pressure sensor P2 malfunction; sensor not responding or reading invalid	Pressure sensor P2 returns invalid or out-of-range reading during diagnostics	error
`MIXER RAM FAIL`	Runtime walking pattern check on RAM failed	Mixer Status Bit STS_RAMPATTERN_FAIL	error
`MIXER RAM FAIL`	Mixer RAM memory failure; self-test detected defective memory	Mixer RAM self-test failed during startup or operation	error
`MIXER SW WDOG`	Mixer Watchdog has been activated	Watchdog timer expiration	warning
`MIXER SW WDOG FAIL`	Mixer software watchdog timer triggered; processor hang or firmware deadlock	Mixer watchdog timer expired; firmware did not reset watchdog counter	error
`MIXER VOLTS FAIL`	Mixer power supply (on board) is out of tolerance	Status bit STS_VOLT_REF_FAIL. +12.5 V (10 VA) to mixer not OK.	error
`MIXER XX FLOW CHECK FAIL`	Flow verification failed on specified gas channel; measured flow not as expected	Mixer flow verification test shows actual flow does not match commanded value	error
`MIXER XX FLOW CHECK FAIL`	Mixer gas-specific flow check failure	Flow check on specified gas line failed	error
`MIXER XX Flow FAIL`	Flow failure on specified gas channel; unable to deliver requested flow	Proportional valve unable to achieve commanded flow on specified channel	error
`MIXER XX Flow FAIL`	Mixer gas-specific flow failure	Unable to deliver specified gas flow	error
`MIXER XX F SENSOR FAIL`	Flow sensor failure on specified gas channel (XX = BAL GAS, O2, AIR, or N2O)	Flow sensor malfunction detected on specified channel during diagnostics	error
`MIXER XX F SENSOR FAIL`	Mixer gas-specific flow sensor failure	Flow sensor on specified gas line malfunction	error
`MIXER XX SELECTION VLV FAIL`	Selection valve failure on specified gas channel; valve unable to switch	Mixer selection valve malfunction; solenoid unresponsive to control signal	error
`MIXER XX SELECTION VLV FAIL`	Mixer gas-specific selection valve failure	Selection valve for specified gas malfunction	error
`MIXER XX TEMP LIMIT`	Mixer gas-specific temperature limit exceeded	Temperature on specified gas line exceeded limit	warning
`MIXER XX TEMP LIMIT`	Gas temperature on specified channel exceeded safe operating limit	Temperature sensor reading above maximum safe temperature threshold	critical
`MIXER XX TSENSOR FAIL`	Temperature sensor failure on specified gas channel (XX = BAL GAS, O2, etc)	Temperature sensor malfunction on specified channel during startup	error
`MIXER XX TSENSOR FAIL`	Mixer gas-specific temperature sensor failure	Temperature sensor on specified gas line malfunction	error
`MIXER XX ZERO FAIL LEAK`	Zero calibration failed on specified channel due to detected internal leak	Mixer zero calibration unable to pass; internal leak detected on channel	error
`MIXER XX ZERO FAIL LEAK`	Mixer gas-specific zero calibration failure, possible leak	Zero calibration failed or gas leak detected	warning
`MIX FRSH GAS SLCT VLV 10VA OVR CUR`	Fresh gas selection valve overcurrent; solenoid drawing excessive current	+12V supply to fresh gas selection valve shows overcurrent or voltage drop	error
`MIX O2 BYPASS VLV 10VA OVER CURR`	Current feedback from O2 Bypass Selector incorrect for 7+ readings	Excessive current readings from O2 Bypass Selector Valve	error
`MODULE NOT COMPATIBLE`	Installed Airway Module is not compatible with system	System detects incompatible module firmware or hardware revision	error
`MVexp low`	Expiratory minute volume below acceptable level	Measured expiratory minute volume falls below minimum threshold	warning
`N2O PRESS LOW`	N2O supply pressure low	N2O pipeline <252 kPa and cylinder <2633 kPa	warning
`Negative airway pressure`	Negative pressure detected in airway; potential PEEP valve failure or obstruction	Pressure transducer reads below zero during exhalation phase	error
`NO EXPIRATORY FLOW SENSOR`	No Expiratory sensor connected and not calibrating	Expiratory sensor not detected during startup	error
`No Fresh Gas Flow!`	Fresh gas flow not detected during ventilation; gas delivery failure	No flow measured from gas outlet during ventilation attempt	critical
`NO INSP/EXP FLOW SENSOR`	No inspiratory/expiratory flow sensor detected or functional during ventilator circuit test	Full Test - Vent and Gas execution	warning
`NO INSP/EXP FLOW SENSOR`	Flow sensors have been removed from circuit	When instructed to calibrate flow sensors; message appears after sensor removal	info
`NO INSPIRATORY FLOW SENSOR`	No Inspiratory sensor connected and not calibrating	Inspiratory sensor not detected during startup	error
`***NOTE: Alarm speaker not detected. Check connection.`	Speaker connection fault detected at startup	System startup POST detects no speaker or failed connection	warning
`***NOTE: CMOS battery is weak. Please replace.`	Carrier board CMOS battery voltage insufficient	System startup POST detects weak CMOS battery	warning
`***NOTE: CPU Board Supply Voltage Out of Range.`	CPU power supply voltage outside specification	System startup POST detects 1.5V_CB, 5V_CB, or 3.3V_CB out of range	warning
`***NOTE: RTC date/time error. Battery may be weak.`	Real-time clock date/time not set or invalid	System startup POST detects RTC error	warning
`O2 CAL ERROR`	O2 sensor calibration offset, slope, cell voltage not in range or O2 >110%	Galvanic O2 sensor calibration failure	warning
`O2 FLOW CTRL FAIL`	O2 flow control failure	Mixer status bit STS_FLOW_CTRL_CH1_FAIL with O2 gas supply pressure OK	error
`O2 FLUSH FAILURE`	O2 flush switch detected on continuously >30 sec	Switch reads on for >30 sec without cycling	warning
`O2 PIPE INVALID`	Cannot monitor O2 pipeline; O2 Pipeline pressure is invalid	O2 pressure transducer malfunction	error
`O2 PRESS LOW`	O2 supply pressure low	O2 pipeline <252 kPa and O2 cylinder <2633 kPa for 1 sec	critical
`O2 PROP VALVE FAIL`	O2 proportional valve failure	Mixer status bit STS_CH1_PROPN VALVE FAIL	error
`O2 SENSOR FAILURE`	O2 sensor failure; O2 <5%	Galvanic O2 sensor connected and O2 reading low	warning
`O2 SENSOR NOT CONNECTED`	Oxygen sensor not connected to Airway Module	Airway Module unable to detect O2 sensor connection	warning
`ON/STANDBY SWITCH TO STANDBY`	On/Standby switch transitions from On to Standby	Switch moves to Standby position during therapy	critical
`PATIENT VOLUME MISMATCH OCCURRED`	Patient Volume Mismatch alarm occurred; calibrate, dry, or replace flow sensors	Inspiration/expiration volume discrepancy during checkout	warning
`PCB Alarm Off: 1 min time left`	Battery alarm displayed during system checkout	Low battery time detection during checkout	info
`PCB Alarm Off: AC Mains failure`	AC Power Removed	AC mains voltage loss	info
`PCB Alarm Off: DC-DC power module failure`	System on battery despite AC connected (battery status LOW)	AC GOOD HIGH but BATT STAT 1 and 2 LOW	info
`PCB Alarm On: AC mains failure`	AC Power Removed	AC mains voltage loss	info
`PCB Alarm On: Bulk charge time exceeded in stdby`	Batteries in bulk charge >12 hours while in Standby	Extended bulk charge duration in Standby mode	error
`PCB Saved Alarm Off: 1 min time left`	Battery alarm displayed during system checkout	Low battery time detection during checkout	info
`PCB Saved Alarm Off: AC Mains failure`	AC Power Removed	AC mains voltage loss	info
`PCB Saved Alarm Off: Blk chrg time exceed in stdby`	Batteries in bulk charge >12 hours while in Standby	Extended bulk charge duration in Standby mode	error
`PCB Saved Alarm Off: DC-DC power module failure`	Current draw from batteries >0.25A for 2 min while AC connected	Excessive battery current drain with AC mains present	error
`PCB Saved Alarm On: 1 min time left`	Battery alarm displayed during system checkout	Low battery time detection during checkout	info
`PCB Saved Alarm On: AC Mains failure`	AC Power Removed	AC mains voltage loss	info
`PCB Saved Alarm On: DC-DC power module failure`	Current draw from batteries >0.25A for 2 min while AC connected	Excessive battery current drain with AC mains present	error
`PCB Saved Alarm On: DU to PSC Comm Error`	Power Controller to Display Unit communication was lost then restored	Communication loss and subsequent recovery	info
`PCB Saved Error: POWER CNTRL COM FAIL`	Communication lost between Display Unit and ACB; error stored until re-established	Communication loss between Display Unit computer and ACB	error
`PEEP high. Blockage?`	Positive end-expiratory pressure elevated; possible obstruction detected	PEEP rises above set value, indicating possible blockage	error
`PEEP High. Blockage?`	Measured PEEP higher than set value; possible breathing circuit obstruction	Positive end-expiratory pressure exceeds commanded setpoint	error
`PEEP PCV NOT AVAILABLE`	Volume ventilation only; no PEEP or PSV available	Paw data in range but Pmanifold <= -15 cmH2O	warning
`Plug in power cable. On battery.`	Power failure; system operating on battery power	Mains power disconnected while system is in operation	critical
`PORT PLUG POST FAIL`	Ventilation fail; monitoring only	Paw > 100 cmH2O for 1 second in POST state	warning
`Power Controller Board`	Communications status of Power Controller Board	System checks communication link during Tools — Communication Status	unknown
`POWER CONTROLLER COM FAIL`	Internal failure; system may shut down	Communications with PC and DC cannot be established for 10 seconds	error
`POWER CONTROLLER SELF TEST`	Internal failure; Power Controller fails self-tests	Power Controller fails self-tests	critical
`POWER SUPPLY 75C`	Circuitry >75°C; shutdown possible	Power supply temperature exceeds 75°C	warning
`Ppeak high`	Peak inspiratory pressure higher than expected; possible resistance or obstruction	Measured peak pressure exceeds acceptable range for ventilation parameters	error
`Ppeak low. Leak?`	Peak inspiratory pressure below expected level; possible leak detected	Peak pressure falls below set value, indicating possible circuit leak	warning
`Pressure Sensor 1/2/3 Failure`	Pressure transducer (P1/P2/P3) on Mixer out of specification	Pressure transducer out of specification	error
`PWR CNTRL DC-DC FAIL`	Using battery; PC fail. AC supply OK but system reports using battery	AC GOOD HIGH but BATT STAT 1 and 2 LOW	warning
`Quick check fails`	Message or failure displayed during system checkout	Failure or message during system checkout	error
`Replace insp / exp flow sensor`	Inspiratory or expiratory flow sensor has failed and requires replacement	Flow sensor failure confirmed during diagnostic testing	error
`REVERSE EXPIRATORY FLOW`	Reverse expiration flow detected; check valves may be faulty	Flow towards patient on both expiratory and inspiratory sensors during inspiration for 6 consecutive mechanical breaths	warning
`Reverse insp / exp Flow`	Inspiratory and expiratory flow sensor channels may be reversed or misconfigured	Flow sensor readings inconsistent with breathing pattern during checkout	warning
`SCGO`	Non-Circle SCGO selected; volume and apnea monitoring off	Non-Circle SCGO mode selected	info
`SEVERE SUSTAINED PAW`	Measured airway pressure >100 cmH2O for 10 seconds	Airway pressure exceeds 100 cmH2O for 10 seconds	error
`STANDBY PATIENT DETECTION`	No fresh gas flow; patient detected during standby	3 volume breaths or 3 CO2 breaths detected within 30 seconds during system checkout	info
`System Leak`	Leak detected in ventilator or breathing system pneumatics; gas escape detected	Bellows pressure or flow imbalance; breathing system leak detection	error
`System Self-tests failed`	Power-on tests failed	Power-on tests fail	error
`Temp Measurement Ch1 High`	Channel 1 temperature measurement above safe operating range; sensor reading high	Temperature sensor on channel 1 reading above acceptable threshold	error
`Temp Measurement Ch2 High`	Channel 2 temperature measurement above safe operating range; sensor reading high	Temperature sensor on channel 2 reading above acceptable threshold	error
`Temp Sensor Fail Balance Gas Ch`	Temperature sensor failure on balance gas channel; sensor malfunction	Balance gas temperature sensor unresponsive during system startup	error
`Temp Sensor Failure Ch1`	Temperature sensor failure on channel 1; sensor malfunction detected	Channel 1 temperature sensor unresponsive or returns invalid reading	error
`TOUCHSCREEN FAILURE`	Touchscreen controller fails communications POST test	Touch panel controller fails POST communications test	warning
`Tv not achieved`	Tidal volume not reached; measured volume less than set volume	Ventilator unable to deliver programmed tidal volume during breathing cycle	error
`Unable to Drive Bellows`	Ventilator bellows cannot be driven; no bellows movement during ventilation attempt	Drive gas pressure absent or insufficient; bellows mechanical failure	critical
`Valve Ch1 Leak Tests Not Done`	O2 leak test skipped	O2 leak test skipped (no O2 supply at power-up)	info
`VENT 1.22V FAIL`	Ventilation fail; monitoring only	Voltage <1.074 Vdc or >1.367 Vdc	warning
`VENT +12.5V FAIL`	Ventilation fail; monitoring only	Nominal 12.5V <11.3 Vdc or >13.13 Vdc	warning
`VENT -6V FAIL`	Ventilation fail; monitoring only	VSIB -6V out of range <-6.72 Vdc or >-5.28 Vdc	error
`VENT +6V FAIL`	Ventilation fail; monitoring only	VSIB +6V out of range <5.51 Vdc or >6.5 Vdc	error
`VENT ADC VREF FAIL`	Ventilation fail; monitoring only	VSIB ADC 3.200V ref voltage <3.179 or >3.221 Vdc	error
`VENT AIRWAY OVERPRESS SIGNAL`	Inspiration stopped; high airway overpressure signal set	High airway overpressure signal set during mechanical ventilation	warning
`VENT AIRWAY OVERPRESS SIGNAL FAIL`	Ventilation fail; monitoring only	High airway overpressure signal set with Paw <90 cmH2O and Pmanifold <80 cmH2O	warning
`Vent check stage 1 failed`	Failure displayed during system checkout stage 1	Failure during checkout stage 1	error
`Vent check stage 2 failed`	Failure displayed during system checkout stage 2	Failure during checkout stage 2	error
`VENT FLOW VALVE FAIL CURRENT`	Ventilation fail; monitoring only	Incorrect current feedback for 7 consecutive readings	warning
`VENT FLOW VALVE FAIL DAC`	Ventilation fail; monitoring only	Incorrect DAC feedback for 3 consecutive readings	warning
`Ventilate Manually`	Automatic ventilation failed; manual ventilation mode recommended or required	Ventilator subsystem failure; unable to provide mechanical ventilation	error
`Ventilator has no Drive Gas`	Drive gas supply to ventilator bellows is absent or insufficient for operation	Drive gas pressure below minimum threshold during ventilation attempt	critical
`Ventilator Interface Board`	Communications status of Ventilator Interface Board	System checks communication link during Tools — Communication Status	unknown
`VENT SIB 10VA OVERCURRENT`	Current feedback from cVIB incorrect	Incorrect current feedback from cVIB	error
`VENT SIB COMMUNICATION FAILURE`	Loss of communication between ACB and cVIB	Loss of communication between ACB and cVIB after initial establishment	error
`VENT SUSTAINED PAW SDOWN`	Ventilation fail; monitoring only	Paw >100 cmH2O for 10 seconds	warning
`VENT VALVE 10VA OVERCURRENT`	Current feedback from Insp Flow Valve incorrect for 7 consecutive readings	Incorrect current feedback from Insp Flow Valve	error
`VENT VALVE POWER FAIL`	Ventilation fail; monitoring only	Nominal 12.5V <11.3 V or >13.13 Vdc	warning
`Vlv Bal Gas Ch Leak Tests Not Done`	Balanced Gas leak test skipped	Balanced Gas leak test skipped (no Balanced Gas at power-up)	info
`Vol vent only. No PEEP or PSV`	Volume control ventilation available but no PEEP or PSV modes working; feature unavailable	Drive gas or control system failure; mode selection error	error
`XX FLOW CTRL FAIL`	Flow control failure on specified gas channel (XX = BAL GAS, O2, AIR, N2O)	Proportional valve unable to reach commanded flow setpoint	error
`XX FLOW CTRL FAIL`	Gas-specific flow control failure	Flow control on specified gas line malfunction	error
`XX PROP VALVE FAIL`	Proportional valve failure on specified gas channel; valve not responding to control	Proportional valve solenoid or electronics malfunction; no valve response	error
`XX PROP VALVE FAIL`	Gas-specific proportional valve failure	Proportional valve on specified gas line malfunction	error

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ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.