Anesthesia machines · Carestation family

GE Healthcare Carestation 650: troubleshooting and error codes

The ServiceForge knowledge base holds 187 documented symptoms for the GE Healthcare Carestation 650, with 291 ranked causes, 434 diagnostic checks with test points and expected values, and 145 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Vent engine component seal degradation caution

Loss of gas tightness or component leakage due to worn seals or o-rings

Ranked causes

1. Gas inlet valve solenoid seal worn or damaged (occasional)
2. Gas inlet valve o-ring worn or damaged (occasional)
3. Interface manifold o-rings degraded (occasional)
4. Drive gas regulator o-rings worn (occasional)
5. Inspiratory flow control valve o-rings worn (occasional)
6. Flow sensor o-rings degraded (occasional)
7. Free breathing check valve o-ring worn (occasional)
8. Reservoir o-rings degraded (occasional)

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

Breathing system leak from canister or valves patient safety

Gas leaking from absorber canister, check valves, APL valve, breathing tubes, or negative pressure relief valve

Ranked causes

1. Absorber canister open or missing (common)
2. Damaged or missing canister o-ring or seals (occasional)
3. APL valve not closed (common)
4. Breathing system tubes damaged or connectors loose (occasional)
5. Check valve of inspiratory or expiratory ports not correctly installed (occasional)
6. Negative pressure relief valve leak (rare)

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

Check flow sensor failure patient safety

During mechanical breaths, measured flow to and from patient does not meet criteria; no or negative flow on inspiration or expiration sensor.

Ranked causes

1. Flow sensor connection loose or disconnected (common)
2. Breathing circuit issue (common)
3. SIB sensor tubing leak (occasional)
4. Flow sensor calibration out of range (occasional)
5. Insp/Exp check valve failure (occasional)
6. Flow sensor defective (occasional)

First check

Verify flow sensor connections are seated

Test point: Flow sensor connectors
Expected: Fully plugged in

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

High pressure leak detected high voltage

Gas leaking from high-pressure system components (pipeline, O2 flush valve, cylinders, transducers, gaskets, relief valves)

Ranked causes

1. Pipeline leak (common)
2. O2 flush valve malfunction (common)
3. Cylinder not installed properly (occasional)
4. Cylinder transducer leak (occasional)
5. Cylinder gasket failure (occasional)
6. Relief valve malfunction (occasional)

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

Ventilator leak test – cannot empty bellows patient safety

System cannot empty bellows during ventilator leak test (manifold pressure must be ≥60 cmH2O).

Ranked causes

1. Patient Y not open (common)
2. Drive gas leak from bellows housing to atmosphere (occasional)
3. Bellows installation error or bellows leak (occasional)
4. Pop-off valve leak (occasional)
5. Ventilator exhalation valve leak (occasional)
6. Drive Gas Check Valve stuck open (rare)

First check

Set Bag/Vent switch to Vent, open patient Y, select Confirm

Test point: Bellows emptying
Expected: Bellows empty completely

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

Circuit leak test – cannot pressurize patient safety

Breathing circuit leak test cannot pressurize circuit during testing.

Ranked causes

1. Test bag not properly occluded or test bag leaks (common)
2. Leak in canister or CO2 bypass (occasional)
3. Leak in O2 cell (occasional)
4. Leak in patient port or Y piece (occasional)
5. Leak in APL assembly (occasional)

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

DCB procedure com fail patient safety

Anesthesia Computer loses communication with Display Computer; procedure messages missing or mismatched for >15 seconds.

Ranked causes

1. ACB to FIB or SIB communication cable disconnected (common)
2. Display Unit cable connection loose (occasional)
3. Display Controller board failure (occasional)
4. ACB failure or disconnection (occasional)

First check

Reboot system

Test point: System startup
Expected: ACB and DCB re-establish communication

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

Gas inlet valve bootup fail patient safety

Gas inlet valve solenoid self-test fails at boot-up; ventilator cannot control gas delivery.

Ranked causes

1. Gas inlet valve solenoid connector disconnected or loose (common)
2. Gas inlet valve solenoid defective (occasional)
3. Gas inlet valve mechanical failure (occasional)
4. ACB solenoid drive circuit failure (rare)

First check

Verify gas inlet valve solenoid connector is seated

Test point: Gas inlet valve solenoid connector on ACB
Expected: Fully plugged in, no loose pins

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

Leak in both bag and vent modes patient safety

Gas escapes from breathing circuit in both bag and vent operational modes

Ranked causes

1. Canister seal, body, or cover defective (common)
2. Flow sensor or Paw transducer port leakage on SIB board (common)
3. Patient ports assembly defective (common)
4. Canister or circuit board connectors, filters, or tubes defective (occasional)

First check

Perform Test 7 for canister leakage

Test point: Canister handle port
Expected: Airway Pressure rises to >=30 cmH2O at 0.1 L/min O2 flow

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

Loss of ventilator parameter settings patient safety

Ventilator parameter settings from Display Computer not received for >10 seconds; ventilator operates in monitoring-only mode.

Ranked causes

1. ACB to FIB or SIB communication cable disconnected (common)
2. Display Unit cable connection loose (occasional)
3. Display Controller board failure (occasional)
4. ACB connection or failure (occasional)

First check

Reboot system

Test point: System startup and communication re-establishment
Expected: ACB receives vent parameters within 10 seconds

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

Low pressure leak with vaporizer mounted caution

Gas leaking from low-pressure system when vaporizer is installed; includes vaporizer installation, o-ring, fill port issues

Ranked causes

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

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

Ventilator circuit leak exceeds 750 ml/min patient safety

During ventilator leak test, detected leak rate exceeds 750 ml/min threshold.

Ranked causes

1. Leak in canister or CO2 bypass (common)
2. Leak in O2 cell (common)
3. Leak in patient port or Y piece (common)
4. Leak in sample gas return line or gas return port inside bellows (occasional)

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

Ventilator leak test – cannot pressurize circuit patient safety

During ventilator leak test, circuit cannot be pressurized to required level.

Ranked causes

1. Leak in canister or CO2 bypass (common)
2. Leak in O2 cell (common)
3. Leak in patient port or Y piece (common)
4. Leak in sample gas return or gas return port inside bellows (occasional)

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

Bellows leak or dysfunction patient safety

Bellows not sealing properly, mounting issues, or physical damage affecting ventilation

Ranked causes

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

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

Bellows over inflate patient safety

Bellows bulging excessively during operation due to exhaust blockage or O2 flush malfunction

Ranked causes

1. Exhaust outlet is blocked (occasional)
2. O2 flush button is malfunctioning (occasional)
3. Flow mixer module is malfunctioning (occasional)

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

Circuit leak test – timed out patient safety

Breathing circuit leak test times out without establishing required pressure.

Ranked causes

1. Unsuitable test bag (too large or too soft) (common)
2. Leak inside O2 flush valve manifold (occasional)
3. Leak from O2 bypass, latch, N2O selector, or Air selector valve (occasional)

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

Com error ventilator to ACB patient safety

No communication between Ventilator boundary object and SIB CPU; loss of ventilator function.

Ranked causes

1. Communication cable disconnected or damaged (common)
2. SIB module failure (occasional)
3. ACB failure (occasional)

First check

Reboot system

Test point: System startup
Expected: System boots and establishes communication within 35ms

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

CPU fan speed fail caution

CPU cooling fan speed drops below 2500 RPM (50% nominal), indicating fan failure or obstruction.

Ranked causes

1. CPU heatsink fan not operating (common)
2. Fan connector disconnected (common)
3. Fan defective (common)

First check

Verify CPU fan is spinning

Test point: CPU heatsink fan visual inspection
Expected: Fan rotating

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

CPU overheat caution

CPU thermal diode temperature exceeds 80°C, indicating insufficient cooling.

Ranked causes

1. CPU fan not operating (common)
2. Fan connector disconnected (common)
3. Fan defective (common)

First check

Check CPU fan airflow

Test point: Back of Display Unit fan outlet
Expected: Warm air flowing from fan filter opening

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

Display arm positioning incorrect caution

Display arm not properly positioned side-to-side or at wrong tilt angle; may move with finger pressure or drop by own weight

Ranked causes

1. Arm mounting nut loose (common)
2. Display mount attachment nut loose (common)
3. Axis bar clamping screws insufficiently tight (common)

First check

Display moves when finger pressure applied to 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

Fan fail caution

Cooling fan power status bit is low; fan needs service but system operation OK.

Ranked causes

1. Fan connector loose or disconnected (common)
2. Cooling fan defective (occasional)
3. Power Management Board (PMB) failure (rare)

First check

Check cooling fan connector

Test point: Fan power connector on motherboard or PMB
Expected: Fully seated, no loose pins

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

Leak in bag mode only patient safety

Gas escapes from breathing circuit during bag mode operation

Ranked causes

1. APL valve or diaphragm assembly defective (common)
2. BTV assembly, bag port, or negative valve defective (common)
3. Breathing circuit components improperly installed (common)

First check

Verify breathing circuit assembly installation

Test point: APL valve, Bag/Vent Switch, Cross Rubber
Expected: All components properly seated and connected

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

Leak in vent mode only patient safety

Gas escapes from breathing circuit during vent mode operation

Ranked causes

1. U-Cup seal defective in bellows housing (common)
2. Pop-off diaphragm defective or bellows base port damaged (common)
3. BTV rubber, manifold, or O-ring seals defective (occasional)

First check

Perform Test 6 for bellows housing leakage

Test point: BTV port on upper BC assembly base
Expected: Airway Pressure rises to >=30 cmH2O at 0.1 L/min O2 flow

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

Low pressure leak with or without vaporizer caution

Gas leaking from low-pressure system; includes port valve, gas control module, flush valve, bellows issues

Ranked causes

1. Leaking port valve on vaporizer manifold (common)
2. Leak in gas control module (occasional)
3. Leaking flush valve (occasional)

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

Right top task light not functioning

Right task light does not illuminate, dimmer switch inoperative, or light is defective

Ranked causes

1. Defective right top task light board (common)
2. Defective task lights dimmer switch (occasional)
3. Defective right top task light harness (occasional)

First check

Verify right top task light illuminates

Test point: Right top task light
Expected: Light is lit

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

System cannot initiate ventilation mode; breathing system not engaged or drive gas unavailable

Ranked causes

1. Breathing system not fully engaged (common)
2. No drive gas supply (occasional)
3. Defective Bag/Vent switch (occasional)

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

Vaporizer leak test failure patient safety

Vaporizer leak test detects leak rate exceeding 750 ml/min.

Ranked causes

1. Vaporizer port O-ring damaged or missing (common)
2. Nipple or vaporizer manifold port leak (occasional)
3. Vaporizer internal leak (occasional)

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

Ventilator leak test – circuit pressure too high patient safety

During ventilator leak test, circuit pressure is higher than expected when patient Y is occluded.

Ranked causes

1. Drive gas leak from bellows into bellows due to pop-off or bellows failure (occasional)
2. Leak inside O2 flush valve manifold (occasional)
3. Leak from O2 bypass, O2 latch, N2O selector, or Air selector valve (occasional)

First check

Occlude patient Y and select Confirm during ventilator leak test

Test point: Circuit pressure
Expected: Within normal range

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

Bag/Vent switch or CO2 bypass defective patient safety

Bag/vent mode not switching, ventilation mode malfunction, or CO2 bypass stuck

Ranked causes

1. Bag/Vent switch assembly defective (occasional)
2. CO2 bypass stuck or defective (occasional)

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

Bellows fills slowly or rapidly

O2 Flush button depressed continuously; bellows fill time outside expected range (1.3–3 seconds)

Ranked causes

1. Large leak in breathing system (common)
2. ACGO selector valve not correctly connected (occasional)

First check

Measure bellows fill time with O2 Flush button fully depressed

Test point: patient port
Expected: 1.3 to 3 seconds

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

Canister holder assembly damaged

Canister release lever broken, canister support base cracked, or holder not securing canister

Ranked causes

1. Canister release lever broken or bent (occasional)
2. Canister support base cracked or deformed (rare)

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

Drive gas flow sensor calibration zero fail

Drive gas flow sensor power-on self-test failed; sensor unable to calibrate zero offset.

Ranked causes

1. Flow sensor connection loose or disconnected (common)
2. Flow sensor defective (occasional)

First check

Verify drive gas flow sensor connector is seated

Test point: Drive gas flow sensor connector
Expected: Fully plugged in, no loose pins

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

Drive gas flow sensor fail

Anesthesia Computer detects drive gas flow sensor failure; ventilator operates in monitoring-only mode.

Ranked causes

1. Flow sensor connection loose or disconnected (common)
2. Flow sensor defective (common)

First check

Verify flow sensor connector is seated

Test point: Drive gas flow sensor connector
Expected: Fully plugged in

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 pressure is low during mechanical ventilation.

Ranked causes

1. O2 supply disconnected or depleted (common)
2. Air supply disconnected or depleted (common)

First check

Verify O2 or Air supply is connected and pressurized

Test point: O2 or Air supply inlet
Expected: Pressure gauge above minimum (see O2 PRESS LOW or AIR PRES LOW troubleshooting)

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

DU-ACB communication failure patient safety

System Malfunction screen displayed; ACB COM FAIL or ACB DCB COM FAIL error; loss of communication between Display Unit and Anesthesia Control Board

Ranked causes

1. Cable connection between ACB and DU loose or faulty (common)
2. ACB TXD/RXD LED failure or ACB internal communication error (occasional)

First check

Visually inspect cable connection between ACB and DU

Test point: RXD (DS5), TXD (DS4) connectors
Expected: Connectors seated firmly and undamaged

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

Flow control system out of specification patient safety

Flow control test fails; gas proportioning or individual flow outputs do not match expected values

Ranked causes

1. Flow control needle valve calibration drift (occasional)
2. Link proportioning system calibration drift (occasional)

First check

Increase N2O flow from minimum and verify O2 concentration or flow tracking

Test point: O2 concentration display or Mixer Output subsystem
Expected: O2 concentration 21% minimum at 0.2 l/min N2O; 21-34% at 1.6 l/min; 21-34% at 5.0 l/min; 21-34% at 9.0 l/min

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

Flow sensor reading out of specification caution

O2, Air, or N2O flow sensor readings outside expected limits during service test

Ranked causes

1. Flowmeter test device not backpressure compensated (occasional)
2. Flow sensor calibration drift (occasional)

First check

Set O2 flow to 1.5 l/min and verify sensor reading

Test point: O2 flow sensor display
Expected: 1.3 to 1.7 l/min, 1.3 to 1.7 l/min

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

Gas flow > 300 ml/min during checkout caution

Gas flow exceeds 300 ml/min while system is in Checkout: General sub-state; operator must turn off gas flow.

Ranked causes

1. Mixer flow sensor zero offset out of calibration (common)
2. Needle valve adjustment out of spec (occasional)

First check

Turn off gas flow

Test point: Gas inlet to mixer
Expected: Gas flow stops

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

Gas inlet valve shuttle assembly degradation caution

Gas inlet valve shuttle not functioning smoothly due to missing or degraded seals

Ranked causes

1. Upper or lower u-cup seal missing or degraded on shuttle (occasional)
2. Shuttle o-ring seal worn or missing (occasional)

First check

Inspect shuttle o-rings and u-cup seals

Test point: Gas inlet valve shuttle assembly
Expected: Seals intact and not degraded

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

Gas module sensor zeroing in progress or not responding caution

Gas Monitor service page displays warming message, no message, or no-gas-module-detected message indicating sensor status during initialization

Ranked causes

1. Gas module connected but sensors still warming or zeroing (occasional)
2. Gas module not detected or disconnected (occasional)

First check

Access Gas Monitor Service and observe sensor warming status message

Test point: Gas Monitor Service page, top left corner
Expected: Either warming message or no message (connected), not no-detected message

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

Ground resistance exceeds limit high voltage

Resistance between exposed metal surface and ground pin on power cord is ≥ 0.20 Ω

Ranked causes

1. Corroded or loose ground connection on power cord (common)
2. Defective power cord (occasional)

First check

Set safety analyzer to measure line voltage

Test point: safety analyzer
Expected: normal polarity indicated

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

Inspiratory/expiratory check valve stuck or defective patient safety

One-way valve not sealing or stuck closed, causing improper gas flow direction

Ranked causes

1. Inspiratory check valve defective (rare)
2. Expiratory check valve defective (rare)

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

Leak test device integrity verification failure

Leak test tool kit is leaking or cannot hold pressure, invalidating test results

Ranked causes

1. Low-pressure leak test device bulb does not inflate or leaks (common)
2. Tool kit (2091916-001) has leaking seals (common)

First check

Verify low-pressure leak test device integrity

Test point: Leak test device inlet and bulb
Expected: Bulb takes more than 60 seconds to fully inflate when hand seals inlet and bulb is squeezed empty, >60 sec

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

Left top task light not functioning

Left task light does not illuminate or is defective

Ranked causes

1. Defective left top task light board (common)
2. Defective left top task light harness (occasional)

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

Manifold PAW sensor fail

Calibration failure at boot-up; manifold pressure sensor unable to zero offset properly.

Ranked causes

1. Manifold pressure sensor tubing occluded (common)
2. ACB manifold sensor circuit failure (rare)

First check

Verify manifold flow sensor counts in Service Software

Test point: Manifold Flow counts in Vent Flow and Pressure section 12.9.2
Expected: Between 2575 and 4447 counts

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

N2O mixer hardware failure

Gas control test detects N2O mixer hardware failure.

Ranked causes

1. O2 bypass or latch valve failure (common)
2. O2 latch or N2O selector valve failure (occasional)

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

O2 flow decreases excessively when vaporizer adjusted caution

O2 flow drops more than 1 l/min when vaporizer concentration is adjusted from 0 to 1%

Ranked causes

1. Malfunction in vaporizer back pressure mechanism (common)
2. Malfunction in anesthesia system vaporizer manifold port valve (occasional)

First check

Set O2 flow to 6 l/min and adjust vaporizer from 0 to 1%

Test point: O2 flowmeter
Expected: O2 flow must not decrease more than 1 l/min, ≤1 l/min decrease

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

SIB cable connection improper caution

SIB cable loose, disconnected, or interfering with breathing system assembly

Ranked causes

1. SIB cable not fully seated or connected (common)
2. SIB cable routing interferes with breathing system assembly (occasional)

First check

Verify SIB-to-ACB cable is fully seated and secure

Test point: SIB cable connector at ACB
Expected: Cable fully connected with no play or movement

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

SIB filter installation incorrect caution

Filters not installed in proper sequence or orientation

Ranked causes

1. Filters installed out of sequence (common)
2. Filter installed with incorrect orientation (occasional)

First check

Verify filter installation sequence

Test point: SIB filter assembly
Expected: Filters a and c installed first, then b, d, e in sequence

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

Vaporizer back pressure exceeds limit

O2 flow decreases more than 1 l/min when vaporizer concentration adjusted from 0 to 1%

Ranked causes

1. Defective vaporizer installed (common)
2. Malfunction in anesthesia system vaporizer manifold (occasional)

First check

Verify O2 flow at 6 l/min baseline

Test point: O2 outlet
Expected: 6 l/min
Tools: flow meter

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

ACB +5VA power supply out of range patient safety

No data; Ventilator failure alarm; system unable to operate normally due to power supply voltage excursion

Ranked causes

1. ACB +5VA power supply voltage out of specification (< 4.85 V or > 5.15 V) (occasional)

First check

Measure ACB +5VA power supply voltage

Test point: ACB +5VA supply rail
Expected: Between 4.85 VDC and 5.15 VDC, +/-0.15V
Tools: Digital multimeter

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

Access rear electronics enclosure for repair high voltage

Need to access rear panels to repair or replace machine components including electronics

Ranked causes

1. Component repair or replacement required (unknown)

First check

Bleed all gas pressure from the machine

Test point: System pressurization state
Expected: All pressure bled

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

ACGO pressure relief valve not functioning patient safety

ACGO pressure relief weight does not relieve or pop off from seat; no purring sound heard during test

Ranked causes

1. ACGO pressure relief valve stuck or blocked (occasional)

First check

Set ACGO selector switch position

Test point: ACGO selector switch
Expected: ACGO position

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

Anesthesia Control Board power supply voltage out of range high voltage

5 volt digital or analog supply measured outside 4.85–5.15 Vdc range, displayed in red text on diagnostics screen

Ranked causes

1. +5 VD or +5 VA supply voltage outside 4.85–5.15 Vdc (unknown)

First check

Measure +5 VD Supply voltage on Anesthesia Control Board

Test point: Anesthesia Control Board
Expected: 4.85 to 5.15 Vdc, 4.85–5.15

1 more check with pass and fail actions are in ServiceForge. Connect ServiceForge to your AI

APL valve assembly defective patient safety

APL valve not opening/closing properly or pressure not relieving

Ranked causes

1. APL valve assembly defective (rare)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

Auxiliary O2 flow rate outside specified limits

Flow test device reading does not match expected values for selected flowmeter settings during accuracy test

Ranked causes

1. Flowmeter calibration drift or internal wear (occasional)

First check

Verify flow test device capability

Test point: Flow test device specifications
Expected: Device measures 0-15 l/min with ±2% accuracy

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

Auxiliary O2 flowmeter ball does not respond correctly

Flowmeter ball does not rise smoothly when flow control is rotated counterclockwise, does not stay at bottom when closed, or does not maintain steady position at set flow

Ranked causes

1. Flowmeter internal mechanism stiction or contamination (occasional)

First check

Rotate flow control clockwise to minimum

Test point: Flowmeter ball and control
Expected: Ball rests at bottom of flow tube and does not move

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

Auxiliary O2 flowmeter not operating smoothly or ball not moving

Ball in flowmeter does not rise smoothly when control rotated counterclockwise or does not maintain steady position at set flow

Ranked causes

1. Flowmeter obstruction, sticky ball, or control valve blockage (common)

First check

Verify O2 supply available

Test point: O2 cylinder valve or pipeline connection
Expected: O2 cylinder valve ON or pipeline connected

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

Battery does not maintain charge or runs down too quickly patient safety

System shuts down in less than 50 minutes when running on battery power under standard load

Ranked causes

1. Battery capacity degradation or failed battery cell (common)

First check

Configure system for battery test

Test point: System settings
Expected: Anesthetic Agent: None, Task Light: max, LCD Brightness: 5, Keypad brightness: 5

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

Bellows assembly damaged or stuck patient safety

Bellows housing not rotating freely or bellows cracked/leaking

Ranked causes

1. Bellows housing stuck or bellows damaged (unknown)

1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI

More symptoms

Bellows fills slowly during flush test
Bellows fills too quickly during flush test
Bottom task light not functioning
Calibration: Adjust drive gas regulator
Calibration: Airway gas module
Calibration: Airway Pressure and ACGO Span
Calibration: Airway Pressure Span (Paw Span)
Calibration: Bellows drop test
Calibration: Bleed Resistor
Calibration: Circuit leak test
Calibration: Flow control test
Calibration: Flow sensing test
Calibration: Inspiratory Flow Valve
Calibration: Low pressure leak test with ACGO
Calibration: Low pressure leak test without ACGO
Calibration: Manifold P Span
Calibration: Mixer Flow Sensor Zero
Calibration: O2 needle valve minimum flow
Calibration: O2 supply alarm test
Calibration: Paw and ACGO Span
Calibration: Paw Span
Calibration: Pipeline and cylinder high-pressure leak test
Calibration: Primary regulator output pressure
Calibration: Secondary regulator output pressure
Calibration: Touch screen misaligned
Calibration: Zero ACGO/AGSS
Calibration: Zero Gas Transducers
Carrier and Com Express board assembly replacement
Carrier board overheat
Caster replacement procedure
Caster wheel damaged or non-functional (without central brake)
Central brake system does not operate smoothly
Central vaporizer task light not functioning
Chassis leakage current exceeds limit
CPLD test fail
CPU coin battery replacement on display unit
Customize checklist items
Cylinder check valve defective
Cylinder inlet filter blocked or contaminated
Display arm replacement
Display unit disassembly and component access
Display unit encoder replacement
Display unit front assembly and LCD/Touch bezel replacement
Display unit power and data cable replacement
Display Unit power supply voltage out of range
Display unit removal from machine
Display unit speaker replacement
Exhalation valve diaphragm orientation incorrect
Expiratory flow sensor EEPROM failure
FIB +5VA fail
FIB +5VD fail
Final machine checks incomplete
FiO2 high alarm does not activate or deactivate
FiO2 high alarm does not trigger
FiO2 low alarm does not activate or deactivate
FiO2 low alarm does not trigger
Flow sensor calibration error
Flow sensors defective or misaligned
Flow valve leak test fail
Frame Interface Board power supply voltage out of range
Front caster damaged or non-functional (with new central brake linkage)
Front caster damaged or non-functional (with old central brake linkage)
Front panel com fail
Gas mixer output flow out of range
Gas supply pressure out of range
High pressure leak in cylinder supply
Inspiration stopped during ventilation
Inspiratory flow control valve orientation incorrect
Inspiratory flow sensor EEPROM failure
Inspiratory/expiratory ports assembly damaged
Leakage current exceeds safety limits
Machine serial number or options mismatch after board replacement
MGAS inlet filter residue > 40 sec
MGAS line blocked > 20 sec
MGAS sample flow deviation
MGAS sample gas out blocked > 20 sec
MGAS sample line not connected > 40 sec
MGAS sensor inop
Minute volume low alarm does not trigger
MOPV pressure relief valve not functioning
Multiple vaporizers can be enabled simultaneously
Multiple vaporizers can be turned on simultaneously
MVexp low alarm does not activate
N2O and O2 linkage failure
N2O flow does not decrease with O2 flow
O2 bypass mixer hardware failure
O2 flush valve malfunction
O2 sensor reading inaccurate
Peak airway pressure high alarm does not trigger
Peak airway pressure low leak alarm does not trigger
PEEP blockage alarm does not trigger
PEEP high blockage alarm does not activate
Pipeline inlet check valve stuck or leaking
Pipeline inlet filter contamination or blockage
Pipeline inlet manifold pressure transducer failure
Pneumatic fittings cannot be safely disconnected
Power failure message not displayed correctly
Power Management Board voltage out of range
Ppeak high alarm does not activate
Ppeak low leak alarm does not activate
Pressure limit circuit not functioning
Primary regulator module defective
Scavenger positive relief not functioning correctly
Sensor Interface Board power supply voltage out of range
Set all alarms to clinical limits
SIB pneumatic sense tubing leak
SIB pneumatic sense tubing leak test
Suction flow rate less than minimum
Suction flow rate low
Suction gauge does not bleed to zero when turned off
Suction gauge does not read accurately
Suction gauge needle drifts when turned off with knob not at Off
Suction gauge reading inaccuracy
Suction regulator does not hold set pressure
Suction regulator does not maintain set vacuum
Suction system leaks with valve Off
Suction vacuum does not bleed off when mode selector turned Off
Sustained high airway pressure
System does not power on or power alarm does not activate
Touchscreen unresponsive or fails
Transformer requires replacement
Vent engine drive gas check valve adhesion
Vent flow or pressure measurement out of range
Vent subsystem status parameter abnormal
Ventilator failure with low airway pressure
Ventilator flow valve current feedback failure
Ventilator flow valve DAC feedback failure

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

Error codes

Code	Meaning	Trigger	Severity
`12 HR TEST`	System has been operating more than 12 hours without power cycle self-test	System uptime exceeds 12 hours in Checkout state without a power on/off cycle	info
`ACB +5VD FAIL`	Ventilator failure due to voltage out of range	VACB +5VD < 4.85 VDC or > 5.15 VDC	error
`ACB CLOCK SPEED`	Anesthesia Control Board clock speed out of specification	ACB oscillator or timing circuit failure detected during self-test	critical
`ACB CLOCK SPEED`	System malfunction due to abnormal clock frequency	Clock frequency > 1.1× or < 0.9× expected	error
`ACB COM FAIL`	Communication failure between Display Unit and Anesthesia Control Board	DU unable to receive data from ACB or handshake protocol failure	critical
`ACB COM FAIL`	System malfunction due to communication loss between computers	Display Computer receives no messages from Anesthesia Computer for 10 seconds	error
`ACB CPU TEST FAIL`	Anesthesia Control Board CPU self-test failed	CPU executes invalid instruction or core logic failure detected	critical
`ACB DCB COM FAIL`	System malfunction due to Display Computer communication loss	Anesthesia Computer receives no state messages from Display Computer for 10 seconds	error
`ACB DCB COM FAIL`	Communication failure between ACB and Display Control Board (DCB)	ACB unable to communicate with DCB subsystem or protocol error	critical
`ACB EEPROM FAIL`	Memory failure on ACB	Read/write or CRC failure of EEPROM on ACB	warning
`ACB FIB COMMUNICATION FAIL`	Gas controls failure, O2 only	Interval between valid messages between ACB and FIB exceeds 100 milliseconds	error
`ACB FLASH FAIL`	ACB flash memory read/write failure	Flash memory integrity check failed or data verify error during read/write operation	critical
`ACB FLASH FAIL`	System malfunction due to code memory CRC failure	CRC failure occurs in code space	error
`ACB HW WATCHDOG`	ACB hardware watchdog timer expired	ACB main processor did not service watchdog within timeout period	critical
`ACB MICROPROC ERROR`	ACB microprocessor detected an internal error condition	Microprocessor exception, parity error, or undefined instruction trap	critical
`ACB MICROPROC ERROR`	System malfunction due to microcontroller exception	Unexpected microcontroller exception (bus error, address error, etc.)	error
`ACB PROCEDURE COM FAIL`	System malfunction due to procedure message communication failure	No procedure messages for 15±1 sec or message mismatch for 15±1 sec	error
`ACB PROCEDURE COM FAIL`	Communication failure during ACB procedure execution or command handshake	ACB failed to acknowledge procedure command or lost connection mid-procedure	critical
`ACB RAM ERROR`	ACB RAM memory test or parity error detected	RAM self-test failed or uncorrectable memory parity error during operation	critical
`ACB RAM ERROR`	System malfunction due to memory test failure	Multiple bit errors detected during memory test	error
`ACB REDUNDANT MEMORY FAIL`	System malfunction due to redundant parameter storage failure	Redundantly stored parameter could not be stored or was corrupted	error
`ACB REDUNDANT MEMORY FAIL`	ACB redundant or backup memory verification failed	Redundant memory mirror check or backup memory integrity check failure	critical
`ACB SW ERROR`	ACB software detected an internal error or exception condition	Firmware exception handler invoked due to invalid state or logic error	critical
`ACB SW ERROR`	System malfunction due to unexpected software error	Unexpected software error occurs	error
`ACB SW WATCHDOG`	System malfunction due to software watchdog failure	Software watchdog failed power-up test, timed out, or function delinquent	error
`ACB SW WATCHDOG`	ACB software watchdog timer expired during firmware execution	Firmware task did not complete or report status within watchdog timeout period	critical
`ACB UNEXPECTED RESET`	ACB experienced an unexpected reset or reboot without operator action	ACB core or watchdog forced a system reset during operation	critical
`ACB UNEXPECTED RESET`	System malfunction due to unexpected ACB reset	Unexpected reset of anesthesia computer occurs	error
`ACGO`	Vol and Apnea monitoring off	Non Circle (ACGO) selected	info
`ACMains POWER FAIL`	AC mains power loss, system on battery	ACMains_GOOD goes low and stays low for ≥3 seconds	warning
`AGSS HIGH`	Scavenging flow is too high	AGSS flow exceeds threshold based on configuration (>36, >50, or >80 l/min)	info
`AGSS LOW`	Scavenging flow is too low	AGSS flow below threshold based on configuration (<21 or <42 l/min)	info
`AIR FRESH GAS FLOW SENSOR FAIL`	Fresh gas flow sensor for air inlet failed or out of range	Air flow sensor reports zero or invalid value during gas delivery check	error
`AIR FRESH GAS FLOW SENSOR FAIL`	Gas controls failure, O2 only	FIB reports air fresh gas flow sensor fail to ACB	warning
`AIR MIXER VALVE FAIL`	Gas controls failure, O2 only	Air mixer valve feedback current check failed	warning
`AIR MIXER VALVE FAIL`	Air mixer valve failure or stuck condition detected	Air mixer valve does not respond to command or position feedback invalid	error
`AIR PIPE INVALID`	Cannot monitor air pipeline due to invalid pressure	Air pipeline pressure reading is invalid	warning
`AIR PRESS LOW`	Air supply pressure low	Air pipeline <252 kPa and air cylinder <2633 kPa for 1 second	warning
`AUX`	Vol and Apnea monitoring off	Auxiliary gas turned on	info
`BATTERY CHARGE FAIL`	No battery backup due to charging failure	Standby: charge current >2.0A; powered on: battery current >1.3A	warning
`BATTERY EMPTY`	System shutdown in less than 5 minutes due to battery depletion	Available battery power 1-5 minutes	critical
`BATTERY FAIL`	No battery backup, battery voltage critical	Battery <10.5V, or charging anomalies (duration >12-16h, voltage >15.5V, current <0.15A)	warning
`BATTERY LOW`	Plug in power cable, system on battery	Available battery power 40-60 minutes	warning
`BATTERY MISSING`	No battery backup, battery not connected	Any battery voltage <+2.0 VDC	warning
`BATTERY REVERSED CONNECTIONS`	No battery backup due to reversed battery polarity	Any battery voltage <–10.0 VDC	warning
`BATTERY V LOW`	Plug in power cable, battery power 20-40 minutes remaining	Available battery power 20-40 minutes	warning
`BATT V VERY LOW`	Critical battery depletion, plug in power cable	Available battery power decreases to 5-20 minutes	error
`BELLOWS COLLAPSED`	Unable to drive bellows, manifold pressure excessive	Manifold pressure > Paw + 10 + [0.25×(Insp valve flow)]	info
`BREATHING SYSTEM NOT LATCHED`	Breathing system loose, detection switch indicates not latched	Breathing system detection switch indicates not latched	info
`CAL DATA FAILURE IN EEPROM`	Service calibration advised, default cal data in use	Corrupt data in calibration region of EEPROM	warning
`CARRIER BOARD OVERHEAT`	Cooling fans failed, system may overheat	Both Display Unit thermistors > 65°C, or neither thermistor reading in valid range 0-85°C	warning
`CHECK FLOW SENSOR`	Flow sensor measurements do not meet criteria during mechanical breaths	No or negative flow on inspiratory flow sensor during inspiration, or negative flow on expiratory flow sensor for 6+ consecutive breaths	warning
`COM ERROR VENT TO ACB`	Loss of communication between Ventilator boundary and SIB CPU	No messages received from SIB CPU for 35 milliseconds after initial communication established	critical
`CPLD TEST FAIL`	Complex Programmable Logic Device self-test failure	CPLD internal logic or integrity check failed during startup or periodic test	critical
`CPU FAN SPEED FAIL`	CPU cooling fan speed < 50% nominal (2500 RPM)	CPU fan speed drops below 2500 RPM during operation	warning
`CPU OVERHEAT`	CPU thermal diode temperature exceeds 80°C	CPU thermal diode temperature > 80°C sustained during operation	warning
`DCB PROCEDURE COM FAIL`	Anesthesia Computer loses procedure message communication with Display Computer	No procedure messages for 15s +/- 0.5s, or messages do not match for 15s +/- 0.5s, during Therapy state	critical
`DRIVE GAS LOST`	Ventilator has no drive gas; pressure too low	O2 PRESS LOW alarm active when O2 is drive gas, or Air PRESS LOW active when Air is drive gas, during mechanical ventilation	critical
`DRV GAS FLOW SENSOR CAL ZERO FAIL`	Drive gas flow sensor self-test calibration failed	Drive gas flow sensor zero calibration fails at power-on self-test	warning
`DRV GAS FLOW SENSOR FAIL`	Drive gas flow sensor hardware failure detected	Anesthesia Computer detects drive gas flow sensor failure during operation	warning
`***ERROR: Cannot load DOS! Any Key to retry`	DOS environment failed to load; boot sequence interrupted	System startup attempting to initialize DOS environment	error
`ERROR!! INCOMPATIBLE SOFTWARE`	Software version on USB Media is not compatible with installed subsystem	Software Download process detects incompatible subsystem during compatibility check	error
`***ERROR: No bootable device available.`	System cannot locate or access bootable storage device	System startup attempting to locate bootable device	critical
`***ERROR: Program load failed - CRC.`	Cyclic redundancy check error during software load; data corruption detected	System startup attempting to load software from CF card	critical
`***ERROR: RAM memory error.`	Random access memory hardware failure detected	System startup performing memory diagnostics	critical
`***ERROR: SMM init failure. Press any key to continue.`	System management mode initialization failed; firmware initialization error	System startup attempting to initialize SMM	error
`***ERROR: System reset: ECxx xx xx . . .`	Unexpected system reset with error code; general software failure	System startup detecting previous unexpected reset event	error
`***ERROR: System reset: FFFF FF FF`	CMOS battery has lost contact or voltage below minimum threshold	System startup detecting CMOS battery contact or voltage failure	critical
`***ERROR: The normal Windows CE application is not available`	Windows CE application not found or failed to load	System startup attempting to launch Windows CE application	error
`***ERROR: Watchdog circuit failed.`	Hardware watchdog timer circuit malfunction; system safety feature failed	System startup detecting watchdog circuit failure	critical
`EXP FLOW SENSOR EEPROM FAILURE`	Expiratory flow sensor calibration data cannot be read	Expiratory flow sensor EEPROM read failure during initialization	error
`FAN FAIL`	Cooling fan power status bit indicates fan failure	Fan power status bit is low (FAN1_GOOD bit = 0)	warning
`FIB +5VA FAIL`	FIB +5VA power supply voltage out of tolerance	VFIB +5VA < 4.85 VDC or > 5.15 VDC and FIB +12.5V within range	warning
`FIB +5VD FAIL`	Frame Interface Board +5VD digital power supply out of specification	FIB +5VD supply voltage out of acceptable range detected	error
`FLOW SENSOR CAL ERROR`	Flow sensor calibration out of range	Inspiratory or expiratory flow sensor or airway/manifold pressure sensor zero offset calibration fails	error
`FLOW VALVE LEAK TEST FAIL`	Flow control valve leakage test failed during POST state	Flow control valve fails leakage test during power-on self-test	warning
`FRONT PANEL COM FAIL`	Display panel keypad controller communication failure	Keypad controller fails to send life tick signal for >10 seconds	warning
`GAS FLOW > 300ML/MIN`	Gas flow exceeds 300 ml/min during Checkout: General sub-state	System detects gas flow > 300 ml/min during Checkout: General mode	warning
`GAS INLET VALVE BOOTUP`	Gas inlet valve solenoid self-test failed at boot-up	Gas inlet valve solenoid fails test during system initialization	critical
`INSP FLOW SENSOR EEPROM FAILURE`	Inspiratory flow sensor calibration data cannot be read	Inspiratory flow sensor EEPROM read failure during initialization	error
`LOSS OF VENT PARAMETER SETTINGS`	Ventilator parameter settings communication lost from Display Computer	Ventilator parameters not received from Display Computer for >10 seconds during ventilation mode	warning
`MANIFOLD PAW SENSOR FAIL`	Manifold pressure sensor calibration failed at boot-up	Manifold pressure sensor zero calibration fails during system initialization	warning
`MGAS CHECK SAMPLE GAS OUT >20 SEC`	Airway Module sample line blocked or occluded >20 seconds	Airway Module reports continuous occlusion alarm lasting >20 seconds	warning
`MGAS INLET FILTER RESIDUE >40 SEC`	D-Fend water trap residue buildup reducing airflow >40 seconds	Airway Module reports water trap residue alarm lasting >40 seconds	warning
`MGAS LINE BLOCKED >20 SEC`	Airway Module sample tubing blocked or water trap occluded >20 seconds	Airway Module reports sample tubing occlusion alarm lasting >20 seconds	warning
`MGAS SAMPLE FLOW DEVIATION`	Sample flow < 80% of Airway Module nominal flow (120 ml/min for PROLITE)	Sample flow stays below 80% of module nominal value for 20+ consecutive seconds	info
`MGAS SAMPLE LINE NOT CONNECTED >40 S`	Airway Module sample line or D-Fend module not installed >40 seconds	Airway Module reports open circuit alarm lasting >40 seconds	warning
`MGAS SENSOR INOP > XX`	Airway Module hardware failure or initialization fault	Airway Module reports hardware error (RAM/ROM/EEPROM failure, voltage error, lamp failure) or UPI initialization failure	error
`MODULE NOT COMPATIBLE`	Monitoring Module detected is not compatible with system software	Incompatible airway module connected	warning
`N2O FLOW > 100 ML/MIN`	N2O flow exceeds 100 ml/min at auxiliary outlet	N2O flow > 100 ml/min in Auxiliary Gas Delivery mode	warning
`N2O FRESH GAS FLOW SENSOR FAIL`	Nitrous oxide fresh gas flow sensor failure or out of range	N2O flow sensor reports invalid or zero reading during checkout or delivery	error
`N2O FRESH GAS FLOW SENSOR FAIL`	Gas controls failure, N2O only	FIB reports N2O Fresh Gas Flow Sensor Fail alarm to ACB	warning
`N2O MIXER VALVE FAIL`	Gas controls failure, N2O only	N2O mixer valve feedback current check failed	warning
`N2O MIXER VALVE FAIL`	Nitrous oxide mixer valve failed or does not respond to commands	N2O mixer valve stuck or position feedback invalid during gas mixing operation	error
`N2O PIPE INVALID`	Cannot monitor N2O pipeline	N2O Pipeline pressure is invalid	warning
`N2O PRESS LOW`	N2O supply pressure low	N2O pipeline < 252 kPa and cylinder < 2633 kPa with N2O selected	info
`NO EXPIRATORY FLOW SENSOR`	No expiratory sensor connected and not calibrating	Expiratory flow sensor disconnected or missing during calibration	warning
`NO INSPIRATORY FLOW SENSOR`	No inspiratory sensor connected and not calibrating	Inspiratory flow sensor disconnected or missing during calibration	warning
`***NOTE: Alarm speaker not detected. Check connection.`	Speaker connection failure or speaker not responding	System startup detecting no audio output device	warning
`***NOTE: CMOS battery is weak. Please replace.`	CMOS battery voltage insufficient for proper real-time clock and settings retention	System startup detecting low CMOS battery voltage	warning
`***NOTE: CPU Board Supply Voltage Out of Range.`	One or more processor board supply voltages (1.5V_CB, 5V_CB, or 3.3V_CB) outside acceptable range	System startup performing voltage range validation on Carrier board	critical
`***NOTE: RTC date/time error. Battery may be weak.`	Real-time clock error detected; system time and date not maintained	System startup validating RTC function and battery status	warning
`O2 BYPASS VALVE FAIL`	Oxygen bypass valve failure or stuck condition	O2 bypass valve does not open/close as commanded or position feedback invalid	error
`O2 BYPASS VALVE FAIL`	Gas controls failure, O2 only	O2 bypass valve feedback current check failed	warning
`O2 CAL ERROR`	Calibrate O2 sensor	O2 sensor offset, slope, cell voltage out of range or O2 > 110%	info
`O2 FLOW < 150ML/MIN`	O2 flow low	O2 flow < 150 ml/min in Therapy state	info
`O2 FLUSH FAILURE`	O2 flush stuck on?	O2 Flush Switch detected on continuously > 30 sec	info
`O2 FRESH GAS FLOW SENSOR FAIL`	Gas controls failure, O2 only	FIB reports O2 Fresh Gas Flow Sensor Fail alarm to ACB	warning
`O2 FRESH GAS FLOW SENSOR FAIL`	Oxygen fresh gas flow sensor failure or out of range reading	O2 flow sensor reports zero or invalid value during system checkout	error
`O2 LATCHING VALVE FAIL`	System Malfunction	O2 latching valve feedback current check failed	error
`O2 LATCHING VALVE FAIL`	Oxygen latching valve failure or unable to maintain state	O2 latching valve does not latch or unlatch as commanded during operation	error
`O2 PIPE INVALID`	Cannot monitor O2 pipeline	O2 Pipeline pressure is invalid	warning
`O2 PRESS LOW`	O2 supply pressure low	O2 pipeline < 252 kPa and O2 cylinder < 2633 kPa for one second	error
`O2 SENSOR FAILURE`	Replace O2 sensor	O2 < 5%	info
`ON/STANDBY SWITCH TO STANDBY`	Confirm to shutdown	On/Standby switch activated in Therapy state	error
`PATIENT VOLUME MISMATCH OCCURRED`	Calibrate, dry, or replace flow sensors	PATIENT VOLUME MISMATCH alarm occurred during Checkout	info
`PAW OVERPRESSURE SIGNAL DISCONNECTED`	Vent fail. Monitoring only	SIB reports PAW Overpressure Signal Disconnected alarm to ACB	warning
`PEEP PCV NOT AVAILABLE`	Vol vent only. No PEEP or PSV	Paw data in range but Pmanifold <= -15 cmH2O	warning
`PORT PLUG POST FAIL`	Vent fail. Monitoring only	Paw > 100 cmH2O for 1 second in POST state	warning
`POWER CONTROLLER COM FAIL`	Internal failure. System may shut down	Communications with PC and DC cannot be established for 10 seconds	warning
`POWER CONTROLLER SELF TEST`	Internal failure. System may shut down	Power Controller fails self tests	error
`POWER SUPPLY BOOST > 75C`	Circuitry >75C shutdown possible	Power supply temperature near boost converter exceeds 75C	info
`POWER SUPPLY BUCK > 75C`	Circuitry >75C shutdown possible	Power supply temperature exceeds 75C	warning
`PWR CNTRL DC-DC BOOST FAIL`	Internal failure. System may shut down	Boost converter failure	warning
`PWR CNTRL DC-DC BUCK FAIL`	No battery backup	Battery not connected or buck converter failure	warning
`PWR CNTRL OUTPUT ERROR SWITCHES AC MAIN TO BACKUP POWER`	Power switched to Battery	Output power over/under voltage, switches from AC Mains to backup power	warning
`PWR CNTRL SPL1 CHANNEL ERROR`	System Malfunction	SPL channel 1 current > 0.5A or voltage out of range (>13.2V or <12.1V) 3+ times	error
`PWR CNTRL SPL2 CHANNEL ERROR`	Vent fail. Monitoring only	SPL channel 2 current > 0.85A or voltage out of range 3+ times	error
`PWR CNTRL SPL3 CHANNEL ERROR`	No data. Ventilator failure	SPL channel 3 current > 0.62A or voltage out of range 3+ times	error
`PWR CNTRL SPL4 CHANNEL ERROR`	Power Controller supply channel 4 (SPL4) error or out of specification	Power Controller SPL4 output voltage or current out of range	error
`PWR CNTRL SPL4 CHANNEL ERROR`	Gas controls failure, O2 only	SPL channel 4 current > 1.3A or voltage out of range 3+ times	warning
`PWR CNTRL SPL5 CHANNEL ERROR`	Power Controller supply channel 5 (SPL5) error or out of specification	Power Controller SPL5 output voltage or current exceeds limits	error
`PWR CNTRL SPL5 CHANNEL ERROR`	Gas controls failure, O2 only	SPL channel 5 current > 0.7A or voltage out of range 3+ times	warning
`PWR CNTRL SPL6 CHANNEL ERROR`	Gas monitoring not available	SPL channel 6 current > 0.7A or voltage out of range 3+ times	warning
`REVERSE EXPIRATORY FLOW`	Reverse exp flow. Check valves OK?	Volume >= 20 ml toward patient on expiratory sensor and >= 5 ml on inspiratory during inspiration for 6 consecutive breaths	warning
`SIB +5VA FAIL`	No data. Ventilator failure	VSIB +5VA < 4.85 VDC or > 5.15 VDC	error
`SIB +5VD FAIL`	No data. Ventilator failure	VSIB +5VD < 4.85 VDC or > 5.15 VDC	error
`SIB +5VE2 FAIL`	No data. Ventilator failure	SIB +5VE2 voltage < 4.85 VDC or > 5.15 VDC	error
`STANDBY PATIENT DETECTION`	No fresh gas flow!	3 volume breaths or 3 CO2 breaths detected within 30 seconds during Checkout	error
`TOUCHSCREEN FAILURE`	Touchscreen panel failure	Touch panel controller fails to send a life tick for more than 10 seconds	error
`VENT AIRWAY OVERPRESS SIGNAL`	High airway overpressure signal during ventilation	High airway overpressure signal is set during mechanical ventilation	warning
`VENT AIRWAY OVERPRESS SIGNAL FAIL`	Ventilator failure with airway overpressure signal and low pressure	High Airway overpressure signal set with Paw < 90 cmH2O and Pmanifold < 80 cmH2O	warning
`VENT FLOW VALVE FAIL CURRENT`	Ventilator flow valve current feedback error	Current feedback check failed for flow control valve	error
`VENT FLOW VALVE FAIL DAC`	Ventilator flow valve DAC feedback error	Incorrect DAC feedback check failed for flow control valve	error
`VENT SUSTAINED PAW SDOWN`	Sustained high airway pressure alert	Airway pressure exceeds 100 cmH2O for 10 seconds	critical

Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI

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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.