Anesthesia machines · A-Series family

Mindray A7: troubleshooting and error codes

The ServiceForge knowledge base holds 257 documented symptoms for the Mindray A7, with 365 ranked causes, 467 diagnostic checks with test points and expected values, and 211 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Breathing system leak patient safety

Audible hiss or visible gas escape from breathing system connections, or inability to maintain pressure during ventilation.

Ranked causes

1. CO2 absorber canister not installed properly (common)
2. CO2 absorber canister sealing component damaged (occasional)
3. Bag arm seal damaged (occasional)
4. Water collection cup loose or seal damaged (common)
5. Circuit adapter assembly seal damaged (occasional)
6. Bellows housing or bellows not installed properly (common)
7. Bellows sealing cushion damaged or fallen off (occasional)
8. Breathing valve cover not installed properly or seal damaged (common)
9. Patient breathing tube damaged (occasional)
10. Bellows damaged (rare)
11. Other breathing system sealing connection damaged (rare)
12. Condensate valve not installed properly or internal seal damaged (occasional)

First check

Visually inspect all breathing system connections

Test point: all breathing circuit connections
Expected: All connections seated securely, no visible gaps or hissing

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

Inaccurate tidal volume patient safety

Measured tidal volume does not match set value; may include inconsistency between TVe and TVi readings.

Ranked causes

1. Flow sensor not installed properly (common)
2. Inappropriate fresh gas flow setting (common)
3. Breathing system leaks with insufficient fresh gas flow (occasional)
4. Water buildup inside flow sensor (occasional)
5. Flow sensor membrane distorted, dirty or zero drift in pressure sensor (occasional)
6. Flow sensor pressure sampling pipeline leak (occasional)
7. Flow sensor damaged (rare)
8. Pressure sensor on ventilator control board defective (rare)
9. Inlet gas flow regulator of expiratory valve assembly defective (rare)
10. Plimit set too low causing early expiration (occasional)
11. TVe and TVi measurements differ; sensor calibration error (occasional)

First check

Verify flow sensor installation

Test point: Flow sensor seating and alignment
Expected: Flow sensor properly seated and aligned

4 more checks with pass and fail actions, 11 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Accessories and breathing circuit component leaks caution

Leakage detected at Paw gauge, water collection cup, O2 sensor, check valve dome, bag arm, or pre-pak assembly connection points.

Ranked causes

1. Damaged manual bag (occasional)
2. Damaged breathing tube (occasional)
3. Damaged Paw pressure gauge seal (occasional)
4. Damaged water collection cup seal (occasional)
5. Damaged O2 sensor seal or plug seal (occasional)
6. Damaged check valve dome seal (occasional)
7. Damaged bag arm seal (occasional)
8. Damaged pre-pak assembly seal (occasional)

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

Automatic circuit leak test fails patient safety

Safety valve control test fails or automatic circuit leak test reports excessive leak (≥200 mL/min and ≤1000 mL or >1000 mL)

Ranked causes

1. Bellows not fully inflated before test (common)
2. Y piece not connected to test plug (common)
3. Bellows housing not properly installed (common)
4. Leak in bellows, breathing tubes, or CO2 absorber canister (common)
5. Drive gas pressure low (occasional)
6. Safety valve malfunction (occasional)

First check

Verify bellows fully inflated

Test point: Bellows housing
Expected: Bellows fully expanded

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

Flow waveform displayed irregularly patient safety

Flow waveform on display shows abnormal shape, dropouts, or erratic behavior instead of smooth sinusoidal or expected pattern.

Ranked causes

1. Flow sensor assembly not installed properly (common)
2. Water accumulated inside flow sensor assembly (occasional)
3. Flow sensor membrane distorted, dirty, or pressure sensor zero drift (occasional)
4. Flow sensor damaged (rare)
5. Pressure sensor on fresh flow sensor board defective (rare)
6. Flow sensor pressure sampling pipeline leaks (occasional)

First check

Verify flow sensor mechanical installation

Test point: flow sensor assembly mounting
Expected: Flow sensor seated firmly with no movement or gaps

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

Pneumatic system leak in O2 supply or related assemblies caution

Test pressure reading falls dramatically and continuously after gas supply is turned off, indicating leak in O2 inlet, expiratory valve, flush button, system switch, or O2 flow regulator.

Ranked causes

1. Leak in O2 supply inlet assembly (occasional)
2. Leak in expiratory valve assembly (occasional)
3. Leak in O2 flush button assembly (occasional)
4. Leak in system switch assembly (occasional)
5. Leak in O2 flow regulator (occasional)

First check

Monitor test pressure gauge after turning off pipeline gas supply

Test point: System pressure via O2 inlet test setup
Expected: Pressure does not fall dramatically and continuously; stable reading indicates no leak
Tools: 1 MPa test pressure gauge

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

Machine cannot be started after power is applied

System fails to boot or initialize despite power being present

Ranked causes

1. System switch is damaged (rare)
2. Cable connected to system switch is disconnected (occasional)
3. Power board hardware circuit failure with no voltage output (occasional)
4. Power board software code error (occasional)

First check

Verify system switch connection

Test point: System switch cable
Expected: Connected

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

Screen is not lit

Display remains dark, no backlight visible

Ranked causes

1. Inverter cable disconnected (occasional)
2. Screen backlight board damaged (occasional)
3. Power board hardware failure causing improper output (rare)
4. Power board software failure (rare)

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

Ventilation sound heard then Calibration Failure displayed patient safety

Machine ventilates initially but calibration fails immediately after Start selected

Ranked causes

1. Sampling line disconnected or reversed on flow sensor (common)
2. Maximum inspiratory valve flow less than 90 L/min (occasional)
3. Pneumatic circuit connection error between machine and calibration device (occasional)
4. Communication connection error or settings error on calibration device (occasional)

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

AG module insertion and alarm test patient safety

Verify AG module detection, watertrap detection, and airway occlusion alarm function after module insertion.

Ranked causes

1. AG module not properly detected (occasional)
2. Watertrap not detected (occasional)
3. Airway occlusion alarm malfunction (rare)

First check

Remove and reinstall AG module

Test point: Module rack
Expected: Module inserted fully and locked

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

APL valve, median plate support tube or Auto/Manual switch seal damage caution

Leakage from APL valve, support tube on median plate, or Auto/Manual ventilation switch sealing components.

Ranked causes

1. Damaged APL valve seals (occasional)
2. Damaged median plate support tube seals (occasional)
3. Damaged Auto/Manual ventilation switch seals (occasional)

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

Calibration: AG Module (Anesthetic Gas) patient safety

Calibration of internal or external AG module using standard calibration gas; requires specific gas concentrations and setup.

Ranked causes

1. Machine in BFCS state instead of EFCS (occasional)
2. N2O supply pressure low (occasional)
3. Calibration points not conforming to monotonicity (occasional)

First check

Prepare calibration gas system

Test point: Gas cylinder, T-connector, tubing
Expected: Gas concentration: AA≥1.5%, CO2≥1.5%, N2O≥40%, O2≥40%, a/c≤0.01

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

Calibration: Electronic Flow Control System (EFCS) zeroing failure

Troubleshooting steps when EFCS zeroing fails; addresses mechanical and electronic faults.

Ranked causes

1. Trapped gas in machine or flowmeter imbalance (common)
2. Mechanical failure in three-way valve or proportional valve fault (occasional)
3. Sensirion flow sensor or EFCS board fault (occasional)

First check

Disconnect gas supplies and bleed machine

Test point: Gas inlet, flowmeter
Expected: Pressure gauge pointer returns to zero

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

Heater is ineffective caution

Heater does not warm as expected or produces insufficient heat

Ranked causes

1. Heater driver and control circuit in power board damaged (occasional)
2. Heater is damaged (occasional)
3. Heater internal sensor is ineffective (rare)

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

Network connection fails

Machine cannot establish or maintain network connectivity

Ranked causes

1. Network connection board cables are loose (common)
2. Network cable is too long (occasional)
3. Network cable is used incorrectly (occasional)

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

No ventilation sound after Begin; Calibration Failure displayed patient safety

Machine fails to ventilate and error message appears immediately after Begin is selected

Ranked causes

1. Auto/Manual ventilation switch in bag position (common)
2. Drive gas (O2) pressure below 200 kPa (common)
3. Zero point error on inspiratory/expiratory flow sensor (occasional)

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

Pinsp Not Achieved patient safety

In pressure mode, inspiratory pressure less than target for 6 consecutive cycles

Ranked causes

1. Breathing circuit leakage (common)
2. Pressure sensor measurement accuracy error (occasional)
3. Ventilator control board failure (rare)

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

Pressure sensor sampling line connected incorrectly or not connected patient safety

During normal ventilation, Paw waveform decreases with increasing actual pressure. Alarms 'Paw Too Low' or 'Patient Circuit Leak' occur. A/D value of pressure sensor decreases or remains unchanged with increasing PEEP D/A value.

Ranked causes

1. Airway pressure sensor sampling line connected incorrectly (common)
2. Airway pressure sensor sampling line not connected (occasional)
3. Airway pressure gauge defective (rare)

First check

Observe Paw waveform during normal ventilation with increasing actual pressure

Test point: Patient airway pressure waveform display
Expected: Paw waveform should increase with increasing actual pressure

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

Touch panel is unresponsive

Touch screen does not respond to user input or touch commands

Ranked causes

1. Touch panel is damaged (occasional)
2. Touch panel controller is damaged (rare)
3. Touch panel cable is disconnected (occasional)

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

Troubleshooting: Total Flow Sensor calibration failure

Common failures during total flow sensor calibration and recommended corrective actions.

Ranked causes

1. Machine in BFCS state instead of EFCS (common)
2. N2O supply pressure low (common)
3. Calibration points not conforming to monotonicity (occasional)

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

Unit does not power on and screen is not lit high voltage

AC and battery indicator lamps are not lit, machine cannot ventilate, screen is dark

Ranked causes

1. AC power supply not connected and battery capacity insufficient (common)
2. AC input breaker tripped and battery capacity insufficient (common)
3. Power board fuse burned and battery capacity insufficient (occasional)

First check

Verify AC power supply connection

Test point: AC inlet
Expected: Properly connected

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

Vaporizer manifold assembly leaks

Negative pressure ball fully expands within 30 seconds during vaporizer manifold leak test, indicating damaged seals or washers.

Ranked causes

1. Rubber plain washer upper surface or contacted mechanical surface damaged (unknown)
2. Rubber plain washer lower surface or contacted mechanical surface damaged (unknown)
3. Seal rings damaged (unknown)

First check

Test upper rubber washer seal by negative pressure ball

Test point: tube 53 outlet at vaporizer manifold
Expected: Negative pressure ball fully expands within 30 seconds

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

ACGO mode pressure insufficient patient safety

ACGO mode pressure fails to reach 30 cmH2O within 1 minute at 0.2 L/min O2 flow

Ranked causes

1. Leak in ACGO circuit or port seal defective (common)
2. O2 flow regulator malfunction or blockage (occasional)

First check

Verify ACGO port is properly sealed

Test point: ACGO port on system
Expected: Port is plugged securely

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

AIR cylinder pressure drops excessively

AIR cylinder pressure gauge drops more than 10% of initial pressure within 1 minute after closing cylinder

Ranked causes

1. Leak at AIR yoke connection or cylinder (common)
2. Defective AIR cylinder valve (occasional)

First check

Inspect AIR yoke connection and washer

Test point: AIR cylinder yoke on rear panel
Expected: Cylinder seated flush, clean washer in place

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

Alarm messages display without sound patient safety

Alarm text appears on screen but no audible alarm sound is produced

Ranked causes

1. Speaker is damaged (occasional)
2. Speaker cable is disconnected (occasional)

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

Automatic backup flow control system (BFCS) fails to deploy patient safety

BFCS does not extend during automatic backup flow control test

Ranked causes

1. BFCS mechanically stuck (occasional)
2. Solenoid of BFCS is faulty (occasional)

First check

Visually inspect BFCS for mechanical obstruction

Test point: BFCS assembly
Expected: No visible obstruction or damage

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

BFCS mode O2/AIR line pressure drops excessively

Line pressure gauge shows drop exceeding 10 psi per 100 seconds in BFCS mode when hoses disconnected

Ranked causes

1. Leak in O2 or AIR line pressure circuit (common)
2. Defective back pressure regulator or related valve (occasional)

First check

Prepare system for O2/AIR line pressure test in BFCS mode

Test point: System settings
Expected: BFCS deployed, O2 and AIR needle valves fully open

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

BFCS three-way valve failure

Three-way valve in BFCS circuit not functioning correctly, measured flow less than expected

Ranked causes

1. Three-way valve malfunction or flow sensor error (common)
2. O2 flow sensor error in total limb (occasional)

First check

Set O2 flows around 1LPM under EFCS and check total limb flow vs O2 limb flow

Test point: [Setup]?[Service]?[Data Monitors]?[Component]?[FCS]
Expected: Total limb flow not obviously smaller than O2 limb flow by more than 0.2LPM, ≤0.2LPM difference

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

Breathing system has significant leak in mechanical ventilation patient safety

Folding bag collapses or excessive fresh gas compensation required during mechanical ventilation

Ranked causes

1. Leak in bellows, sodalime canister, patient tubes, flow sensors or connectors (common)
2. PEEP safety valve not functioning correctly (occasional)

First check

Observe fresh gas compensation rate and bellows bag behavior

Test point: Bellows housing and fresh gas inlet
Expected: Minimal fresh gas compensation; bellows bag does not collapse

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

Calibration: Flow sensor (user level)

Tidal volume measurement shows deviation greater than 9% from set value, or flow sensors have been replaced in breathing circuit.

Ranked causes

1. Flow sensor ageing or environmental drift (common)
2. Flow sensor replacement or reinstallation (occasional)

First check

Perform breathing system leak test in mechanical ventilation mode

Test point: Mechanical ventilation mode test result
Expected: Leak test passed

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

Calibration: PEEP valve pressure patient safety

Verify pressure sensor accuracy across PEEP valve settings (5, 20, 50, 70, 90 cmH2O) using calibration device.

Ranked causes

1. Pressure sensor calibration required (common)
2. Deviation exceeds tolerance after calibration (occasional)

First check

Set safety valve to ON in diagnostic menu

Test point: Calibration Front Control Panel
Expected: Safety valve ON

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

Check Flow Sensors

Inspiratory or expiratory reverse flow detected, or sampling lines incorrectly connected

Ranked causes

1. Check valve failure allowing reverse flow (common)
2. Sampling lines connected in incorrect order (common)

First check

Check valve inspection

Test point: Check valve
Expected: Functioning correctly, no reverse flow

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

CO2 Absorber Canister Not Locked

CO2 canister not mounted or not locked properly

Ranked causes

1. CO2 absorber canister not mounted or improperly seated (common)
2. Cable between canister and ventilator control board disconnected or defective (occasional)

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

Communication between CPU and infrared communication board fails

Data transmission fails between main CPU board and infrared communication module

Ranked causes

1. Cables between CPU board and infrared board are loose (common)
2. Communication board or CPU board is damaged (rare)

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

Drive Gas Pressure Low caution

Drive gas pressure below normal operating range

Ranked causes

1. Actual gas supply pressure low or defective pressure switch (common)
2. Pressure switch or ventilator control board connection issue (occasional)

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

EFCS mode O2/N2O/AIR line pressure drops excessively

Line pressure gauge shows drop exceeding 10 psi per 100 seconds in EFCS mode when hoses disconnected

Ranked causes

1. Leak in O2, N2O, or AIR line pressure circuit (common)
2. Defective proportional valve or 3-way valve assembly (occasional)

First check

Prepare EFCS mode with proportional valves set to maximum

Test point: SERVICE menu FCS TESTS
Expected: 3-Way Valve (CPU/FPGA) set to H; O2/N2O/AIR Prop Valve DA all set to 4000

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

Flow Sensor Failure

Inspiratory or expiratory flow sensor out of range or disconnected

Ranked causes

1. Flow sensor zero point or measurement out of specifications (common)
2. Flow sensor cable disconnected or loose connection (common)

First check

Check flow sensor zero point within specifications

Test point: Flow sensor zero point
Expected: Within specifications

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

Flow sensor sampling lines connected incorrectly

A/D value decreases with increasing actual flow, or A/D value stays unchanged, or A/D value reaches saturation quickly. Diagnostic Tests shows anomalous flow sensor readings.

Ranked causes

1. Two sampling lines connected backward (occasional)
2. One or both sampling lines not connected or broken (occasional)

First check

Observe A/D value of flow sensor with gradual increase of D/A value of inspiratory valve

Test point: Flow sensor A/D value in Diagnostic Tests
Expected: A/D value should increase gradually with increased gas supply

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

Insp Valve Failure

Inspiratory valve voltage error or flow error detected

Ranked causes

1. Inspiratory flow sensor error (common)
2. Inspiratory valve voltage error or power supply connection issue (common)

First check

Check inspiratory flow sensor specifications

Test point: Inspiratory flow sensor
Expected: Within specifications

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

Inspiratory valve does not open correctly patient safety

With increased D/A value in Diagnostic Tests, flow sensor values change very little and low gas flow felt at water collection cup outlet. Standard flow measurement device fails to reach 90 L/min target.

Ranked causes

1. Inspiratory valve assembly defective (common)
2. D/A converter on Ventilator Control Board defective (occasional)

First check

Gradually increase D/A value of inspiratory valve; observe flow sensor readings and gas flow at water collection cup outlet

Test point: Flow sensor A/D values and outlet gas flow
Expected: Flow sensor values should change substantially and adequate gas flow at outlet

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

N2O cylinder pressure drops excessively

N2O cylinder pressure gauge drops more than 10% of initial pressure within 1 minute after closing cylinder

Ranked causes

1. Leak at N2O yoke connection or cylinder (common)
2. Defective N2O cylinder valve (occasional)

First check

Inspect N2O yoke connection and washer

Test point: N2O cylinder yoke on rear panel
Expected: Cylinder seated flush, clean washer in place

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

No gas output through valve in mechanical ventilation mode patient safety

Gas does not flow from valve during mechanical ventilation even though mode is selected

Ranked causes

1. Auto/Manual ventilation switch is defective (occasional)
2. Valve cannot be opened (occasional)

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

O2 concentration measurement fails or has great deviations patient safety

AG Module reports oxygen concentration readings that are inaccurate or vary significantly from expected values during operation.

Ranked causes

1. AG Module not calibrated (common)
2. AG Module damaged (rare)

First check

Verify AG Module calibration status

Test point: service mode AG Module status
Expected: AG Module calibrated per last service date

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

O2 cylinder pressure drops excessively

O2 cylinder pressure gauge drops more than 10% of initial pressure within 1 minute after closing cylinder

Ranked causes

1. Leak at O2 yoke connection or cylinder (common)
2. Defective O2 cylinder valve (occasional)

First check

Inspect O2 yoke connection and washer

Test point: O2 cylinder yoke on rear panel
Expected: Cylinder seated flush, clean washer in place

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

Patient Circuit Leak patient safety

Pressure less than 2cmH2O for 30 seconds during mechanical ventilation or patient not connected

Ranked causes

1. Breathing circuit connection loose or flow sensor misconfigured (common)
2. Breathing system leakage (common)

First check

Check tidal volume measurement accuracy

Test point: Flow sensor, breathing circuit
Expected: Accurate measurement within specifications

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

PEEP safety valve does not switch on or off correctly patient safety

When PEEP safety valve is switched on, no click heard, or pressure does not respond to valve switching. 'Drive Gas Pressure Low' alarm when PEEP safety valve is permanently OFF and gas supplies within specifications.

Ranked causes

1. PEEP safety valve assembly defective (common)
2. Safety valve drive voltage circuit on Ventilator Control Board defective (occasional)

First check

In Diagnostic Tests, switch PEEP safety valve on; listen for click sound

Test point: PEEP safety valve click audible
Expected: Subtle click should be heard when switching on

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

PEEP Valve Failure

PEEP valve voltage error or pressure error detected

Ranked causes

1. PEEP valve pressure sensor error (common)
2. PEEP valve voltage error or power supply connection issue (common)

First check

Check PEEP circuit pressure sensor

Test point: PEEP circuit pressure sensor
Expected: Within specifications

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

Screen flashes or flickers

Display is lit and shows content but screen flickers or flashes intermittently

Ranked causes

1. Power board failure causing power fluctuations (occasional)
2. Main control board LVDS time sequence abnormal (occasional)

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

Screen is lit but displays no content

Display backlight is on but screen appears blank without any visible content or menu

Ranked causes

1. Screen power supply fuse burned, no 3.3V output (occasional)
2. Main control board failure with no display output (occasional)

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

Sensor zero point check

Verify pressure and flow sensor zero points are within normal range; indicates sensor aging and calibration status.

Ranked causes

1. Sensor zero point out of range (aging or drift) (occasional)
2. Sensor requires replacement (zero point critically out of range) (rare)

First check

Turn off all fresh gases

Test point: Fresh gas flow controls
Expected: All gas flows set to zero

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

System switch assembly leaks

Negative pressure ball fully expands within 30 seconds during system switch assembly leak test, indicating gas leakage or damaged tubing.

Ranked causes

1. Tubing connected to system switch assembly damaged (unknown)
2. System switch assembly damaged (unknown)

First check

Test tubes connected to system switch assembly for leaks

Test point: tube 45 at flow regulator and tube 43 at Y piece
Expected: Negative pressure ball fully expands within 30 seconds

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

Three-way valve malfunction patient safety

Three-way valve fails to switch properly or measured flow is insufficient when switched to BFCS limb during test

Ranked causes

1. Gas supply connection abnormal or supply gas pressure low (occasional)
2. Three-way valve is defective (occasional)

First check

Verify gas supply connection and pressure

Test point: Gas supply line to three-way valve, drive gas pressure gauge
Expected: Gas supply secure, pressure 350-450 kPa, 350-450 kPa

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

Vt Not Achieved patient safety

Tidal volume less than setting value for 6 consecutive cycles, difference >20% or 50ml

Ranked causes

1. Breathing circuit leak (common)
2. Pressure sensor measurement accuracy error (occasional)

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

3-way Valve Failure

Error in solenoid valve electrical signal control status

Ranked causes

1. Solenoid valve connection line issue (common)

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

Absorb canister assembly leak patient safety

Pressure drops more than 10 cmH2O in 30 seconds during absorb canister pressure hold test, indicating internal leakage.

Ranked causes

1. Damaged seals or connectors on absorb canister assembly (unknown)

First check

Absorb canister assembly pressure retention

Test point: Anesthesia machine calibration device pressure reading
Expected: Pressure drop of 10cmH2O or less within 30s after stopping injector push, or less

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

ACGO assembly leak caution

Negative pressure ball expands within 30 seconds when ACGO assembly is isolated, indicating internal leakage.

Ranked causes

1. Damaged seals in ACGO assembly or circuit adapter connectors (unknown)

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

ACGO Failure

Status of ACGO switch is incorrect

Ranked causes

1. Drive gas pressure out of normal range or ACGO switch malfunction (common)

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

AG airway occluded patient safety

AG module pump rate dropped below minimum threshold indicating airway obstruction or sampling line blockage

Ranked causes

1. AG module sampling line or airway occluded, pump rate below 20 ml/min (common)

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

AG airway occluded alarm not activating patient safety

Alarm 'AG Airway Occluded' does not appear when inlet hose is occluded

Ranked causes

1. Airway occlusion detection sensor failure (unknown)

First check

Verify 'AG Airway Occluded' alarm when inlet hose occluded

Test point: AG module inlet hose and monitor screen
Expected: Alarm 'AG Airway Occluded' appears

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

AG calibration failed patient safety

AG module calibration procedure did not complete or calibration values out of acceptable range

Ranked causes

1. AG module calibration failure or sensor drift (common)

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

More symptoms

AG communication stopped
AG data limit exceeded
AG hardware error
AG initialization error
AG module 'Airway Occluded' alarm does not activate
AG module 'No Watertrap' alarm does not appear or disappear appropriately
AG Module airway occlusion detection failure
AG module calibration verification
AG module does not load or display correctly
AG module does not unload cleanly
AG module does not unload or unload message does not appear
AG module hardware malfunction
AG module measurement abnormal
AG Module missing watertrap alarm
AG module not detected or not loading correctly
AG Module not loading or error on insertion
AG module software version incompatible
AG no watertrap alarm not appearing or not clearing
AG watertrap disconnected
AG watertrap requires replacement
AG watertrap type mismatch
AG zeroing failed
AIR pipeline pressure gauge reading differs from test gauge by >0.1 MPa
AIR supply failure alarm does not activate
AIR supply failure not triggering alarm
AIR supply inlet pressure outside specification range
Airway pressure gauge shows inaccurate reading or pointer cannot move
Auto Ventilation Disabled
Auto Ventilation Disabled - Leak Test Failed
Auto Ventilation is Non-Functional
Automatic backup flow control system (BFCS) fails to retract
Aux Control Module Comm Stop
Auxiliary light does not illuminate
Battery replacement
Bellows housing or manual ventilation valve leak
Breathing system leak in manual ventilation mode
Breathing system leak in mechanical ventilation mode
Breathing system leaks in manual ventilation mode
Breathing system leaks in mechanical ventilation mode
Calibration Failure after 15 minutes
Calibration failure: Flow sensor (automatic)
Calibration: ACGO mode pressure verification
Calibration: AG Module concentration
Calibration: BFCS line pressure leak test
Calibration: EFCS flowmeter zero offset
Calibration: EFCS line pressure leak test
Calibration: Flow accuracy of EFCS
Calibration: Flow sensor accuracy
Calibration: Flow sensor measurement deviations
Calibration: Flow sensor system
Calibration: Flow sensors
Calibration: O2 sensor at 100% oxygen
Calibration: O2 sensor at 21% oxygen
Calibration: Pressure and flow sensor zero point
Calibration: Pressure sensor system
CGO assembly leaks
Check pressure sensor accuracy
Check valve pressure integrity test
Check valve pressure retention test
Clear package software installation
CO2 measurement accuracy out of specification
Desflurane measurement accuracy out of specification
DGSS circuit pressure below minimum or exceeds maximum
DGSS malfunction or improper pressure
Drive gas pipeline leak in circuit adapter
EFCS gas concentration or flow verification failure
EFCS gas flow accuracy out of specification
Electronic ACGO Undetected
Electronic flowmeter measurement abnormal
End-tidal CO2 measurement out of range
End-tidal desflurane measurement out of range
End-tidal enflurane measurement out of range
End-tidal halogenated agent measurement out of range
End-tidal isoflurane measurement out of range
End-tidal N2O measurement out of range
End-tidal O2 measurement out of range
End-tidal sevoflurane measurement out of range
Enflurane measurement accuracy out of specification
Error code [00 00 00 02] displayed
Error code [00 00 00 04] displayed
Error code [00 00 00 08] displayed
Error code [00 00 00 10] displayed
Error code [00 00 00 20] displayed
Error code [00 00 00 40] displayed
Error code [00 00 00 80] displayed
Error code [00 00 01 00] displayed
Expiratory valve drive gas pressure switch defective
External AG module not connected
External AG self-test failure
Flow regulator knob gets loose
Flow regulator leaks
Flow sensor accuracy check
Flow sensor measurements inconsistent or inaccurate
Flow sensor readings inconsistent across three sensors
Flowmeter float indicates inaccurate value or remains unmoved
Fresh gas circuit connections leak
Fresh gas pipeline leak in circuit adapter
Gas mixer leaks
Gas pump rate out of range
Gas supplies cannot be turned off after machine is turned off
Halothane measurement accuracy out of specification
High inspiratory O2 alarm activation test
High minute volume alarm activation test
High peak airway pressure alarm activation test
Inspired CO2 measurement out of range
Inspired desflurane measurement out of range
Inspired enflurane measurement out of range
Inspired halogenated agent measurement out of range
Inspired isoflurane measurement out of range
Inspired N2O measurement out of range
Inspired O2 measurement out of range
Inspired sevoflurane measurement out of range
Internal AG calibration failure error 08
Internal AG communication failure or malfunction error 05
Internal AG hardware error 01
Internal AG initialization error 04
Internal AG installation or malfunction error 03
Internal AG parameter values out of range error 12
Internal AG pump rate low error 10
Internal AG self-test error 02
Internal AG watertrap change required error 11
Internal AG watertrap device loose error 09
Internal AG zeroing failure error 07
Isoflurane measurement accuracy out of specification
License activation
Line pressure gauge reading inaccurate
Line pressure gauge readings inaccurate
Line voltage alarm does not activate when AC power lost
Line voltage alarm not activating on AC loss
Low inspiratory O2 alarm activation test
Low minute volume alarm activation test
Low peak airway pressure alarm activation test
Machine cannot be powered on after turning on
Manual circuit leak test fails
Mechanical ventilation not provided normally
Mixed halogenated agents with high MAC
Mixed halogenated agents with invalid measurement
Mixed halogenated anesthetic agents detected
N2O measurement accuracy out of specification
N2O pipeline pressure gauge reading differs from test gauge by >0.1 MPa
N2O supply failure alarm does not activate
N2O supply failure not triggering alarm or cutoff
Needle valve leaks
O2 and AIR line isolation failure in BFCS mode
O2 flush button assembly leaks
O2 flush flow verification
O2 measurement accuracy out of specification
O2 needle valve basal flow out of adjustment
O2 pipeline pressure gauge reading differs from test gauge by >0.1 MPa
O2 sensor error
O2 Supply Failure
O2 supply failure alarm does not activate
O2 supply failure not triggering alarm or cutoff
O2 supply inlet pressure outside specification
O2 supply pressure switch defective or out of specification
O2:N2O ratio test (with AG Module, EFCS mode)
O2:N2O ratio test (without AG Module, EFCS mode)
O2:N2O ratio test with EFCS (with AG Module)
O2:N2O ratio test with EFCS (without AG Module)
PEEP Safety Valve Failure
PEEP valve does not open correctly
Position switch where BFCS ejects is faulty
Position switch where BFCS retracts is faulty
Preparation for pneumatic tests
Preset pressure and tidal volume do not match measured values
Pressure and flow zeroing (service)
Pressure relief valve at breathing connection leaks
Pressure sensor accuracy check
Pressure sensor measurements inconsistent or inaccurate
Remove calibration gas regulator
Sensor zero points out of normal range
Sevoflurane measurement accuracy out of specification
Software package selection for board replacement
Software update installation
Software upgrade sequence execution
Suction regulator not functioning correctly
Suction regulator pressure not responding correctly
System does not return to Standby mode after AG module removal
Top light does not illuminate
Top light not illuminating
Total Flow Sensor Self Test failure
Total flowmeter leaks
Touchpad is not responsive
Touchpad not functional
Unable to exit standby mode
Vaporizer installed improperly causing leak
Vaporizer interlock malfunction
Vaporizer interlock not functioning
Vaporizer leak test
Vaporizer manifold assembly damaged
Vaporizer manifold assembly seal damaged
Vaporizer manifold internal seal damaged
Ventilation stops during operation
Ventilator Comm Stop
Ventilator Voltage Error
Waste gas scavenger does not adjust between MIN and MAX
Waste gas scavenger malfunction

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

Error codes

Code	Meaning	Trigger	Severity
`[00 00 00 02]`	Drive gas pressure too low condition	Drive gas (O2) pressure falls below specified minimum during calibration	error
`00 00 00 02`	O2 supply pressure is low during 100% calibration process	O2 supply pressure insufficient during 100% calibration	error
`00 00 00 04`	O2 sensor is disconnected with sampled data greater than 2900 AD value	O2 sensor disconnection detected during calibration	error
`[00 00 00 04]`	Auto/Manual ventilation switch in incorrect position	Auto/Manual switch detected on Manual (bag) position during calibration startup	error
`[00 00 00 08]`	Inspiratory flow sensor zero point error	Zero point AD value out of range: ≥2000 or <0 (EPSON); ≥26457 or <554 (DSP)	error
`00 00 00 08`	21% calibration value outside expected range 150~500 AD value	O2 sensor reads outside normal 21% oxygen range during calibration	error
`[00 00 00 10]`	Expiratory flow sensor zero point error	Zero point AD value out of range: ≥2000 or <0 (EPSON); ≥26457 or <554 (DSP)	error
`00 00 00 10`	100% calibration value outside expected range 800~2028 AD value	O2 sensor reads outside normal 100% oxygen range during calibration	error
`[00 00 00 20]`	Internal flow sensor zero point error	Zero point AD value out of range: ≥2000 or <0 (EPSON); ≥26457 or <554 (DSP)	error
`00 00 00 20`	Error writing to EEPROM memory during calibration	System fails to save calibration data to EEPROM	error
`[00 00 00 40]`	Inspiratory flow sensor measurement range error	Sensor sampling AD value exceeds upper limit: >3900 (EPSON) or >60000 (DSP) at ~90 L/min flow	error
`[00 00 00 80]`	Airway pressure sensor calibration data not unidirectional	Calibration detects non-linear or scattered sensor response	error
`[00 00 00 80]`	Expiratory flow sensor measurement range error	Sensor sampling AD value exceeds upper limit: >3900 (EPSON) or >60000 (DSP) at ~90 L/min flow	error
`[00 00 01 00]`	Internal (ventilator) flow sensor measurement range error	Sensor sampling AD value exceeds upper limit: >3900 (EPSON) or >60000 (DSP) at ~45 L/min flow	error
`[00 00 01 00]`	PEEP pressure sensor calibration data not unidirectional	Calibration detects non-linear or scattered sensor response	error
`[00 00 02 00]`	Inspiratory flow sensor bidirectional flow detected	Calibration data indicates flow in both directions rather than unidirectional only	error
`[00 00 02 00]`	Airway pressure sensor resolution error	Calibration detects insufficient sensor resolution or limited AD range	error
`[00 00 04 00]`	PEEP pressure sensor resolution error	Calibration detects insufficient sensor resolution or limited AD range	error
`[00 00 04 00]`	Expiratory flow sensor bidirectional flow detected	Calibration data indicates flow in both directions rather than unidirectional only	error
`[00 00 08 00]`	Valve output pressure too low	Calibration detects PEEP valve output below acceptable minimum	error
`[00 00 08 00]`	Internal flow sensor bidirectional flow detected	Calibration data indicates flow in both directions rather than unidirectional only	error
`[00 00 10 00]`	Flow change not unidirectional	Calibration detects non-monotonic flow response	error
`[00 00 10 00]`	Inspiratory flow sensor resolution error	Sensor output resolution insufficient; signal noise or quantization error detected	error
`[00 00 20 00]`	Communication with calibration device interrupted	Calibration device connection lost or communication timeout	error
`[00 00 20 00]`	Resolution error in expiratory flow sensor	System calibration process detects expiratory flow sensor resolution fault	error
`[00 00 40 00]`	Resolution error in internal flow sensor	System calibration detects internal flow sensor resolution fault	error
`[00 00 40 00]`	System fails to write EEPROM	Data storage error during calibration	error
`[00 00 80 00]`	Valve output flow is low	Calibration detects valve output flow below minimum threshold	error
`[00 00 80 00]`	ACGO switch in ON position	Calibration attempted with ACGO switch ON	error
`[00 01 00 00]`	Valve resolution is not enough	Calibration detects insufficient valve resolution	error
`[00 02 00 00]`	Maximum pressure value cannot be found	Calibration unable to reach maximum pressure setpoint	error
`[00 02 00 00]`	Flow change is not unidirectional	Calibration detects bidirectional or non-monotonic flow changes	error
`[00 04 00 00]`	Minimum pressure value cannot be found	Calibration unable to reach minimum pressure setpoint	error
`[00 04 00 00]`	Communication with calibration device is interrupted	Calibration process loses connection to external calibration device	error
`[00 08 00 00]`	System fails to write EEPROM	Calibration cannot write calibration data to EEPROM memory	error
`[00 08 00 00]`	PEEP valve closed pressure exceeds threshold (DSP only)	When PEEP valve is closed, calibration device reads over 3 cmH2O	error
`[00 10 00 00]`	Sampling line leakage or disconnection (DSP only)	Calibration detects pressure loss in sampling circuit	error
`[00 10 00 00]`	ACGO switch is in ON position	Calibration detects ACGO switch not in OFF position	error
`[00 20 00 00]`	Maximum valve opening point cannot be found	Pressure calibration cannot establish maximum flow reference point	error
`[00 40 00 00]`	Minimum valve opening point cannot be found	Pressure calibration cannot establish minimum flow reference point	error
`[00 80 00 00]`	DSP platform: Excessive time finding mid-range DA value	Search for DA causing flow between 9-25L/min takes longer than 50 seconds	warning
`[01 00 00 00]`	DSP platform: Calibration device zero point out of range	Calibration device zero point measurement exceeds acceptable range	error
`[02 00 00 00]`	DSP platform: Tube is disconnected	Calibration detects disconnected or loose tube during pressure calibration	error
`[04 00 00 00]`	DSP platform: Inspiratory valve leakage detected	When inspiratory valve is closed, flow measured by sensor exceeds 1L/min	error
`0x00000001`	CPU AVDD voltage too low	AVDD supply voltage drops below threshold	error
`0x00000001`	CPU self-test error	EFCS startup self-test	critical
`0x00000002`	CPU AVDD voltage too high	AVDD supply voltage exceeds threshold	error
`0x00000002`	RAM self-test error	EFCS startup self-test	critical
`0x00000004`	Address line self-test error	EFCS startup self-test	critical
`0x00000004`	Position switch where BFCS ejects is faulty	During system operation when BFCS ejection position detected as faulty	error
`0x00000004`	CPU DVDD voltage too low	DVDD supply voltage drops below threshold	error
`0x00000008`	Watchdog self-test error	EFCS startup self-test	critical
`0x00000008`	CPU DVDD voltage too high	DVDD supply voltage exceeds threshold	error
`0x00000008`	Position switch where BFCS retracts is faulty	During system operation when BFCS retraction position detected as faulty	error
`0x00000010`	CPU DVCC voltage too low	DVCC supply voltage drops below threshold	error
`0x00000010`	FLASH self-test error	EFCS startup self-test	critical
`0x00000010`	BFCS three-way valve failure	Run BFCS auto selftest; measured flow by total flow sensor less than 0.2/min	error
`0x00000020`	CPU DVCC voltage too high	DVCC supply voltage exceeds threshold	error
`0x00000020`	O2 proportional valve self-test error	EFCS startup self-test	critical
`0x00000040`	AIR proportional valve self-test error	EFCS startup self-test	critical
`0x00000040`	FPGA VPP voltage too low	VPP supply voltage drops below threshold	error
`0x00000080`	FPGA VPP voltage too high	VPP supply voltage exceeds threshold	error
`0x00000080`	N2O proportional valve self-test error	EFCS startup self-test	critical
`0x00000100`	FPGA DVCC voltage too low	FPGA DVCC supply voltage drops below threshold	error
`0x00000100`	O2 flow leakage detected	EFCS startup or runtime self-test	critical
`0x00000200`	AIR flow leakage detected	EFCS startup or runtime self-test	critical
`0x00000200`	FPGA DVCC voltage too high	FPGA DVCC supply voltage exceeds threshold	error
`0x00000400`	N2O flow leakage detected	EFCS startup or runtime self-test	critical
`0x00000400`	FPGA 3.3V voltage too low	3.3V supply voltage drops below threshold	error
`0x00000800`	Startup zero reading error	EFCS startup initialization	critical
`0x00000800`	FPGA 3.3V voltage too high	3.3V supply voltage exceeds threshold	error
`0x00001000`	FPGA 1.2V voltage too low	1.2V supply voltage drops below threshold	error
`0x00001000`	FPGA configuration error	Startup initialization	critical
`0x00002000`	FPGA 1.2V voltage too high	1.2V supply voltage exceeds threshold	error
`0x00004000`	AVCC voltage too low	AVCC supply voltage drops below threshold	error
`0x00008000`	AVCC voltage too high	AVCC supply voltage exceeds threshold	error
`0x00010000`	3-way valve power-off voltage too low	Three-way valve control voltage below threshold when powered off	error
`0x00020000`	3-way valve power-off voltage too high	Three-way valve control voltage exceeds threshold when powered off	error
`0x00040000`	3-way valve power-on voltage too high	Three-way valve control voltage exceeds threshold when powered on	error
`0x00080000`	O2 limb flow sensor communication failure	I2C communication between FPGA and Sensirion O2 flow sensor fails for 1 second continuous	error
`0x00100000`	AIR limb flow sensor communication failure	I2C communication between FPGA and Sensirion AIR flow sensor fails for 1 second continuous	error
`0x00200000`	N2O limb flow sensor communication failure	I2C communication between FPGA and Sensirion N2O flow sensor fails for 1 second continuous	error
`0x00400000`	O2 branch flow not achieved (exceeds 0.4 LPM)	O2 flow deviation exceeds 0.4 L/min from setpoint	error
`0x00800000`	Balance gas AIR branch flow not achieved (exceeds 0.4 LPM)	AIR flow deviation exceeds 0.4 L/min from setpoint	error
`0x01000000`	Balance gas N2O branch flow not achieved (exceeds 0.4 LPM)	N2O flow deviation exceeds 0.4 L/min from setpoint	error
`0x02000000`	O2 temperature limit exceeded	O2 supply gas temperature exceeds 50°C	warning
`0x0400000`	AIR temperature limit exceeded	AIR supply gas temperature exceeds 50°C	warning
`0x0800000`	N2O temperature limit exceeded	N2O supply gas temperature exceeds 50°C	warning
`0x1000000`	FPGA failure	FPGA internal self-test or operation failure	critical
`0x2000000`	Flow sensor single selftest error	Flow sensor output inconsistency between limb and total flow sensors	error
`3-way Valve Failure`	Solenoid valve electrical signal control error	Solenoid valve electrical control signal status error detected	info
`ACGO Failure`	ACGO switch status is incorrect	ACGO switch status does not match expected state	warning
`AG Airway Occluded`	AG module sampling line or airway occluded	Pump rate dropped below 20 ml/min for more than one second	error
`AG Cal. Failed`	AG module calibration procedure failed	Calibration routine did not complete or calibration values invalid	error
`AG Change Watertrap`	AG module watertrap requires replacement	Watertrap maintenance interval reached or performance degraded	error
`AG Comm Stop`	Communication with AG module lost or stopped	AG module communication timeout or communication error detected	error
`AG Data Limit Error`	AG module measurement data out of valid range	Measured values exceeded data validity limits during operation	error
`AG Hardware Error`	AG hardware error detected	AG module hardware malfunction detected during operation or self-test	error
`AG Hardware Malfunction module`	AG module hardware malfunction or improper installation	AG module hardware failure detected or module not seated properly	error
`AG Init Error`	AG module initialization failed	AG module failed to initialize during power-up or reset	error
`AG No Watertrap`	AG module watertrap is not connected	Watertrap sensor detects missing or disconnected watertrap during operation	warning
`AG Watertrap Type Wrong`	Wrong watertrap type installed for patient type	Adult watertrap detected when patient type is set to infant	warning
`AG Zero Failed`	AG module zeroing calibration failed	Zero calibration routine did not complete or produced invalid results	warning
`Air Supply Failure`	Compressed air supply pressure loss	Air supply pressure drops below threshold	warning
`Auto Ventilation Disabled`	System self test failure, automatic ventilation disabled, manual only	System self test failure in one or more modules	warning
`Auto Ventilation Disabled - Leak Test Failed`	Automatic circuit leak test failure	Automatic leak test procedure detects circuit failure	warning
`Auto Ventilation is Non-Functional`	Auto ventilation non-functional but Auto/Manual switch in Auto position	Machine in manual-only mode while Auto/Manual switch is in Auto position	critical
`Aux Control Module Comm Stop`	Lost communication with CPU board for 10 seconds	Communication link between CPU Board and ventilator control board interrupted for 10 seconds	critical
`Aux Control Module Selftest Error`	Auxiliary control module self-test failed	Startup initialization	error
`Backup Flow Control Deployment Failure`	Backup flow control system solenoid actuator malfunction	Solenoid actuator fails to deploy backup flow control	critical
`Backup Flow Control Enabled`	Backup flow control system active	Manual activation or automatic activation due to flow sensor malfunction	info
`Backup Flow Control Error`	Backup flow control position sensor or LED circuit malfunction	BFCS ejection/retraction position sensor malfunction or LED voltage input error	warning
`Backup Flow Control Retraction Failure`	Backup flow control system fails to retract	Stepper motor fails to retract backup flow control	warning
`Backup Flow Control Valves Open`	Backup flow control needle valve not fully closed during EFCS operation	Position switch detects needle valve in open position during EFCS use	warning
`Balance Gas Branch Flow Not Achieved`	Balance gas flow below setpoint	Balance gas flow exceeds preset by >10% or >0.2 L/min (greater prevails)	info
`Battery in Use`	Backup power active due to AC mains loss	AC power supply disconnected or failed	warning
`Battery Undetected`	Battery not detected by system	System battery monitoring	warning
`Breathing Circuit Not Mounted`	Breathing circuit not properly installed or connected	Breathing circuit connection not detected	critical
`Bundle Version Error`	Software versions are not compatible	Startup initialization	error
`Calibrate Flow Sensor and Insp Valve`	Flow sensor calibration table invalid	Startup or calibration check	warning
`Calibrate Pressure Sensor and PEEP Valve`	Pressure sensor calibration table invalid	Startup or calibration check	warning
`Calibration Failure! Please try again.`	Calibration process failed to complete successfully	Detected after Begin button selected with ventilation sound or error conditions	error
`Check Flow Sensors`	Inspiratory or expiratory reverse flow detected	Check valve detects reverse flow in insp or exp line	warning
`CO2 Absorber Canister Not Locked`	CO2 canister not mounted or not locked properly	CO2 absorber canister is not detected as properly mounted or locked	critical
`CO2 Accuracy Unspecified`	CO2 measurement accuracy out of specification	Measured CO2 value exceeded module accuracy specification range	warning
`Des Accuracy Unspecified`	Desflurane measurement accuracy out of specification	Measured desflurane value exceeded module accuracy specification range	warning
`Drive Gas Pressure Low`	Drive gas pressure below normal operating range	Drive gas pressure detected below normal specifications	critical
`Electronic ACGO Undetected`	No electronic ACGO module detected by system	System initialization unable to detect electronic ACGO module	info
`Electronic Flow Control Error`	Gas flow control system malfunction	Voltage error in CPU/FPGA supplies; valve malfunction; flow sensor fault; temperature or communication error	warning
`Electronic Flow Control Error`	Total flow sensor self test failed after sensor replacement	Self-test initiated after total flow sensor replacement; sensor failed to validate during initialization	error
`Enf Accuracy Unspecified`	Enflurane measurement accuracy out of specification	Measured enflurane value exceeded module accuracy specification range	warning
`EtCO2 Overrange`	End-tidal CO2 measurement exceeds module measurement range	Measured EtCO2 value exceeded maximum specification during operation	warning
`EtDES Overrange`	End-tidal desflurane measurement exceeds module measurement range	Measured EtDES value exceeded maximum specification during operation	warning
`EtENF Overrange`	End-tidal enflurane measurement exceeds module measurement range	Measured EtENF value exceeded maximum specification during operation	warning
`EtHAL Overrange`	End-tidal halogenated agent measurement exceeds module measurement range	Measured EtHAL value exceeded maximum specification during operation	warning
`EtISO Overrange`	End-tidal isoflurane measurement exceeds module measurement range	Measured EtISO value exceeded maximum specification during operation	warning
`EtN2O Overrange`	End-tidal N2O measurement exceeds module measurement range	Measured EtN2O value exceeded maximum specification during operation	warning
`EtO2 Overrange`	End-tidal O2 measurement exceeds module measurement range	Measured EtO2 value exceeded maximum specification during operation	warning
`EtSEV Overrange`	End-tidal sevoflurane measurement exceeds module measurement range	Measured EtSEV value exceeded maximum specification during operation	warning
`External AG Module Disconnected`	External AG module not connected in FDA standard configuration	FDA configuration detected but external AG module not connected to system	error
`External AG Self Test Error`	External anesthetic gas module self-test failed	Startup initialization	warning
`Fan Failure`	CPU board fan malfunction	Fan speed monitoring	warning
`Fan Failure 02`	Module rack fan malfunction	Module rack fan speed monitoring	warning
`[FF FF FF FF]`	Communication error	System unable to communicate with calibration device or control board	critical
`FiCO2 Overrange`	Inspired CO2 measurement exceeds module measurement range	Measured FiCO2 value exceeded maximum specification during operation	warning
`FiDES Overrange`	Inspired desflurane measurement exceeds module measurement range	Measured FiDES value exceeded maximum specification during operation	warning
`FiENF Overrange`	Inspired enflurane measurement exceeds module measurement range	Measured FiENF value exceeded maximum specification during operation	warning
`FiHAL Overrange`	Inspired halogenated agent measurement exceeds module measurement range	Measured FiHAL value exceeded maximum specification during operation	warning
`FiISO Overrange`	Inspired isoflurane measurement exceeds module measurement range	Measured FiISO value exceeded maximum specification during operation	warning
`FiN2O Overrange`	Inspired N2O measurement exceeds module measurement range	Measured FiN2O value exceeded maximum specification during operation	warning
`FiO2 Overrange`	Inspired O2 measurement exceeds module measurement range	Measured FiO2 value exceeded maximum specification during operation	warning
`FiO2 Too High`	Inspired oxygen concentration above high alarm limit	Inspired O2 exceeds setpoint during ventilation	warning
`FiO2 Too Low`	Inspired oxygen concentration below low alarm limit	Inspired O2 falls below setpoint during ventilation	warning
`FiSEV Overrange`	Inspired sevoflurane measurement exceeds module measurement range	Measured FiSEV value exceeded maximum specification during operation	warning
`Flowmeter Comm Stop`	Communication lost between CPU and flow sensor board	CPU fails to communicate with flow sensor board for 10 seconds	warning
`Flowmeter Selftest Error`	Flow sensor board self-test failed	Startup initialization	error
`Flow Sensor Failure`	Inspiratory or expiratory flow sensor out of range or disconnected	Insp or Exp flow out of range, or internal flow sensor connection lost	info
`Hal Accuracy Unspecified`	Halothane measurement accuracy out of specification	Measured halothane value exceeded module accuracy specification range	warning
`Heating Module Failure`	Anesthesia heating module temperature out of control	Both resistance temps >106°C for 20s OR one >110°C for 15s	error
`Incompatible AG Software Version`	AG module software version below minimum required version 1.7.3	AG module firmware version detected at startup or during self-test	error
`Insp Valve Failure`	Inspiratory valve voltage error or flow error	Inspiratory valve voltage out of spec or flow sensor error detected	warning
`Internal AG Error 01`	Internal AG module hardware error	Internal AG module detected hardware malfunction during operation or self-test	warning
`Internal AG Error 02`	Internal AG module self-test error	Internal AG module self-test failed during startup or periodic diagnostic	warning
`Internal AG Error 03`	Internal AG module not properly installed or malfunction	Internal AG module not seated properly or hardware failure detected	warning
`Internal AG Error 04`	Internal AG module initialization error	Internal AG module failed to initialize during startup or reset	warning
`Internal AG Error 05`	Internal AG module malfunction or communication failure	Internal AG module detected malfunction or communication error with main unit	warning
`Internal AG Error 07`	Internal AG module zeroing failure	Internal AG module zeroing calibration routine failed to complete	warning
`Internal AG Error 08`	Internal AG module calibration failure	Internal AG module calibration procedure failed to complete successfully	warning
`Internal AG Error 09`	Internal AG module watertrap substitute device loose or disconnected	Internal AG module detected watertrap substitute device not securely attached	warning
`Internal AG Error 10`	Internal AG module pump rate below 20 ml/min for more than 1 second	Internal AG pump rate dropped below minimum threshold during operation	warning
`Internal AG Error 11`	Internal AG module watertrap substitute device requires replacement	Internal AG module detected watertrap substitute device maintenance interval reached	warning
`Internal AG Error 12`	Internal AG module parameter values exceed normal range	Internal AG module measured parameters outside normal operating range	warning
`Internal AG Selftest Error 02`	Internal anesthetic gas module self-test failed	Startup initialization	warning
`IP Address Conflict`	Network IP address already in use	Network initialization	warning
`Iso Accuracy Unspecified`	Isoflurane measurement accuracy out of specification	Measured isoflurane value exceeded module accuracy specification range	warning
`Keyboard Comm Stop`	Communication lost between CPU and keyboard/display	CPU fails to communicate with keyboard for 10 seconds	warning
`Keyboard Self Test Error`	Keyboard self-test failed	Startup initialization	error
`Low Battery Voltage!`	Battery voltage critically low	Battery voltage below 10.6V for 5 seconds	error
`Mixed Agent`	Two halogenated agents with low MAC and one agent reading invalid	AG module detects multiple agents with low MAC and measurement error on one agent	error
`Mixed Agent and MAC≥3`	Two halogenated agents detected with MAC ≥3	AG module detects multiple halogenated agents with high combined MAC value	error
`MV Too High`	Minute volume exceeds high alarm limit	Total minute ventilation exceeds setpoint	warning
`MV Too Low`	Minute volume below low alarm limit	Total minute ventilation falls below setpoint	warning
`N2O Accuracy Unspecified`	N2O measurement accuracy out of specification	Measured N2O value exceeded module accuracy specification range	warning
`N2O Supply Failure`	Nitrous oxide supply pressure loss	N2O supply pressure drops below threshold	warning
`NO Fresh Gas`	Fresh gas delivery disabled or not flowing	Fresh gas turned off in manual or mechanical ventilation mode	warning
`O2 Accuracy Unspecified`	O2 measurement accuracy out of specification	Measured O2 value exceeded module accuracy specification range	warning
`O2 Branch Flow Not Achieved`	Oxygen flow below setpoint	O2 flow exceeds preset value by >10% or >0.2 L/min (greater prevails)	info
`O2 Sensor Error`	O2 sensor malfunction in AG module	O2 sensor failure detected during operation or self-test	error
`O2 Supply Failure`	O2 supply pressure failure detected	O2 pressure switch detects supply pressure failure	critical
`Patient Circuit Leak`	Pressure <2cmH2O for 30s during mechanical ventilation or patient not connected	Breathing system pressure drops below 2cmH2O for 30 seconds during ventilation	warning
`Paw Too High`	Peak airway pressure exceeds high alarm limit	Peak pressure reaches or exceeds setpoint during inspiration	warning
`Paw Too Low`	Peak airway pressure below low alarm limit	Peak pressure falls below setpoint during ventilation	warning
`PEEP Safety Valve Failure`	PEEP safety valve malfunction	Safety valve operation	warning
`PEEP Valve Failure`	PEEP expiratory valve malfunction	Valve operation or pressure monitoring	warning
`PEEP Valve Failure`	PEEP valve voltage error or pressure error	PEEP valve voltage out of spec or pressure sensor error detected	warning
`Pinsp Not Achieved`	Inspiratory pressure less than target value for 6 consecutive cycles	In pressure mode, Pinsp is <2/3 of setting (if >9cmH2O) or <setting-3cmH2O (if <9cmH2O) for 6 cycles	info
`Power Board High Temp`	Power board temperature exceeds safe limits	Power board temperature greater than 95°C for 10 seconds continuously	warning
`Power Supply Voltage Error`	Power supply voltage out of specification	Voltage monitoring at startup or runtime	error
`Power Supply Voltage Error (Power Board)`	Power supply voltage out of specification	Voltage monitoring on power board	error
`Power System Comm Stop`	Communication lost with CPU board	Power board communication timeout (10 seconds)	error
`Rate Overrange`	Gas pump rate measurement exceeds module measurement range	Measured pump rate value exceeded maximum specification during operation	warning
`RT Clock Failure`	Real-time clock chip malfunction	Startup or time-dependent operation	error
`RT Clock Needs Battery`	Real-time clock battery depleted or missing	Startup initialization	error
`Sev Accuracy Unspecified`	Sevoflurane measurement accuracy out of specification	Measured sevoflurane value exceeded module accuracy specification range	warning
`System going DOWN, Battery depleted!`	Battery voltage completely depleted	Battery voltage below 10.2V	error
`Ventilator Comm Stop`	Lost communication with CPU board for 10 seconds	Communication link to CPU board interrupted for 10 seconds	critical
`Ventilator Initialization Error`	Ventilator control board initialization failed	Startup initialization	error
`Ventilator Selftest Error`	Ventilator control board self-test failed	Startup initialization	error
`Ventilator Voltage Error`	5V or 12V voltage error in ventilator control module	Input voltage on power cable detected out of specification	error
`Ventilator Voltage Error`	Ventilator control module voltage out of specification	Startup or runtime voltage measurement	error
`Vt Not Achieved`	Tidal volume less than setting value for 6 consecutive cycles, >20% or 50ml difference	TVi <TV setting value for 6 cycles for >20% or 50ml difference	info

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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.