Anesthesia machines · Anesthesia System family

Mindray A5: troubleshooting and error codes

The ServiceForge knowledge base holds 301 documented symptoms for the Mindray A5, with 603 ranked causes, 399 diagnostic checks with test points and expected values, and 178 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Pressure calibration: System failure

Troubleshooting for pressure calibration process that fails with error code display.

Ranked causes

1. Drive gas pressure too low (error 00 00 00 02) (common)
2. Auto/Manual switch in Manual position (error 00 00 00 04) (common)
3. Airway pressure sensor zero point error (error 00 00 00 08) (occasional)
4. PEEP pressure sensor zero point error (error 00 00 00 10) (occasional)
5. Airway pressure sensor measurement range error (error 00 00 00 20) (occasional)
6. PEEP pressure sensor measurement range error (error 00 00 00 40) (occasional)
7. Airway pressure sensor calibration data not unidirectional (error 00 00 00 80) (rare)
8. PEEP pressure sensor calibration data not unidirectional (error 00 00 01 00) (rare)
9. Airway pressure sensor resolution error (error 00 00 02 00) (rare)
10. PEEP pressure sensor resolution error (error 00 00 04 00) (rare)
11. Valve output pressure too low (error 00 00 08 00) (occasional)
12. Flow change not unidirectional (error 00 00 10 00) (rare)
13. Communication with calibration device interrupted (error 00 00 20 00) (occasional)
14. System fails to write EEPROM (error 00 00 40 00) (rare)
15. ACGO switch in ON position (error 00 00 80 00) (common)
16. Valve resolution insufficient (error 00 01 00 00) (rare)
17. Communication error (error FF FF FF FF) (occasional)

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

Pneumatic circuit leaks patient safety

Loss of pressure or gas leakage from breathing system connections, seals, or components; may affect ventilation delivery.

Ranked causes

1. Damaged seals on lifting device connections (common)
2. Damaged manual bag (common)
3. Damaged breathing tube (common)
4. Damaged Paw pressure gauge seal (common)
5. Damaged water collection cup seal (common)
6. Damaged O2 sensor or plug seal (common)
7. Damaged check valve dome seal (common)
8. Damaged bag arm seal (common)
9. Damaged prepak assembly seal (common)
10. Defective APL valve seals (common)
11. Defective support tube seals on median plate (common)
12. Defective Auto/Manual ventilation switch seals (common)
13. Damaged CGO assembly or connectors (occasional)
14. Leaky flow sensor pressure sampling pipeline (occasional)

First check

Turn off system switch

Test point: System power
Expected: Off

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

Breathing system leaks patient safety

Air leaks from breathing circuit components including CO2 absorber canister, seals, bellows, or valve assembly

Ranked causes

2. Sealing piece for absorbent canister assembly is damaged (occasional)
3. Seal for bag arm is damaged (occasional)
4. Water collection cup is loose (common)
5. Seal for water collection cup assembly is damaged (occasional)
6. Seal for circuit adapter assembly is damaged (occasional)
8. Bellows sealing cushion falls off or is damaged (occasional)
9. Valve cover of breathing valve assembly not installed properly (occasional)
10. Seal for valve cover of breathing valve assembly is damaged (occasional)
12. Seal for O2 sensor or sensor plug is damaged (occasional)
13. Breathing tube connecting patient is damaged (occasional)
14. Bellows is damaged (occasional)
15. Sealing connection of other breathing system parts is damaged (occasional)
16. Condensate valve not installed properly or internal seal is damaged (occasional)

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

Calibration: System pressure and PEEP sensors

Automated pressure calibration procedure for airway and PEEP pressure sensors during anesthesia machine service.

Ranked causes

1. Drive gas pressure too low (common)
2. Airway or PEEP pressure sensor zero point error (common)
3. Pressure sensor sampling line disconnected or improperly connected (common)
4. PEEP valve maximum pressure insufficient (occasional)
5. Pneumatic circuit connection error between calibration device and ventilator control board (occasional)
6. Communication connection error between calibration device and anesthesia machine (occasional)
7. Calibration device settings incorrect (occasional)
8. Calibration data not correct (occasional)

First check

Verify drive gas pressure

Test point: O2 pressure gauge
Expected: At least 200 kPa

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

Seal damage in breathing system components patient safety

Seals damaged or deteriorated in O2 sensor, check valve dome, bag arm, prepak assembly, APL valve, support tube, or Auto/Manual switch.

Ranked causes

1. O2 sensor seal damaged (common)
2. Check valve dome seal damaged (common)
3. Bag arm seal damaged (common)
4. Prepak assembly seal damaged (common)
5. APL valve seal damaged (occasional)
6. Support tube on median plate seal damaged (occasional)
7. Auto/Manual ventilation switch seal damaged (occasional)

First check

Turn off system switch

Test point: Power switch
Expected: System powered off

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

Anesthesia machine cannot be started caution

System does not power up; AC and battery indicator lamps not lit; screen not lit; machine cannot ventilate

Ranked causes

1. AC power supply not connected or battery capacity insufficient (common)
2. AC input breaker tripped with insufficient battery (common)
3. Power board fuse burned with insufficient battery (occasional)
4. System switch damaged or cable disconnected (occasional)
5. Power board hardware failure: no voltage output (15.2V, 3.3V, 5V, 12V) (rare)
6. Power board software code error: no voltage output (15.2V, 3.3V, 5V, 12V) (occasional)

First check

Verify AC power supply connection

Test point: AC power connector
Expected: AC cable firmly connected to wall outlet and machine connector

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

Flow waveform displayed irregularly patient safety

Irregular or unstable flow measurement display on monitor screen

Ranked causes

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

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

Inaccurate tidal volume patient safety

Tidal volume readings are incorrect or inconsistent; may show TVe and TVi discrepancies or inaccurate flow measurements.

Ranked causes

3. Significant breathing system leaks with low fresh gas flow (occasional)
4. Water buildup in flow sensor (occasional)
5. Flow sensor membrane distorted, dirty, or resistance changed; zero drift occurs (occasional)
8. Inlet gas flow regulator defective in expiratory valve assembly (occasional)
9. Plimit set too low, causing premature expiration (occasional)
10. TVe and TVi mismatch due to sensor measurement error (occasional)

First check

Turn off flow regulators

Test point: Flow regulators
Expected: Off

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

Calibration failure - Ventilation sound heard then failure patient safety

Ventilation sound occurs initially but calibration fails shortly after Start pressed

Ranked causes

1. Sensor sampling line not connected or connected in reverse order (common)
2. Inspiratory valve maximum flow less than 90 L/min (occasional)
3. Pneumatic circuit connection error between machine and calibration device (occasional)
4. Communication connection fault between machine and calibration device (occasional)
5. Calibration device settings error (occasional)

First check

Verify inspiratory and expiratory flow sensor sampling lines are connected correctly

Expected: All three sensor lines properly connected in correct order

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

Calibration failure: Ventilation sound heard, then failure prompt

After Begin is selected, ventilation sound is heard but '[Calibration Failure! Please try again.]' prompt appears very soon

Ranked causes

1. Sampling line not connected or improperly connected on airway or PEEP pressure sensor (common)
2. PEEP valve maximum pressure less than 95 cmH2O (occasional)
3. Pneumatic circuit connection error between calibration device and ventilator control board (occasional)
4. Communication connection error between calibration device and anesthesia machine (occasional)
5. Calibration device settings incorrect (occasional)

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

Calibration: Flow sensor patient safety

Flow sensor calibration fails or measurement deviations exceed 9% compared to setting value

Ranked causes

1. Flow sensor aging or environmental drift (common)
2. Flow sensor replaced (common)
3. O2 sensor replaced or recalibrated (common)
4. Breathing system leak (occasional)
5. Drive gas pressure out of specification (occasional)

First check

Perform breathing system leak test

Test point: Breathing circuit
Expected: Leak test passed in mechanical ventilation mode

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

Calibration: Flow sensors patient safety

Flow sensor calibration for breathing system to correct tidal volume measurement deviation or after component replacement

Ranked causes

1. Tidal volume measurement deviation exceeds 9% after prolonged use (common)
2. Flow sensor in patient circuit replaced (occasional)
3. Expiratory valve assembly replaced (occasional)
4. Ventilator control board replaced (occasional)
5. Flow measurement deviation exceeds 5% of reading or 1 L/min (occasional)

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

Flow sensor assembly problems patient safety

Flow waveform displays irregularly or flow measurement is incorrect due to flow sensor assembly issues

Ranked causes

1. Flow sensor assembly not installed properly (common)
2. Water built up inside flow sensor assembly (occasional)
3. Flow sensor membrane distorted, dirty, or internal resistance changes (occasional)
4. Flow sensor is damaged (occasional)
5. Pressure sensor on fresh flow sensor board is defective (rare)

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

Gas supply tube leak caution

Gas escaping from supply tube or connection points

Ranked causes

1. Gas supply tube is damaged (common)
2. Connection seal is damaged (common)
3. Quick plug-in connector is leaking or damaged (occasional)
4. Pipeline gas supply inlet assembly check valve or seal is damaged (occasional)
5. Drive gas pipeline is leaking (occasional)

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

Low-pressure pneumatic circuit system leak patient safety

Breathing system leaks detected during mechanical or manual ventilation modes; pressure loss during test

Ranked causes

1. Bellows housing or sealing cushion leaky (common)
2. Manual ventilation mode bag or APL valve defective (occasional)
3. Expiratory valve assembly or drive gas pipeline leak (occasional)
4. Fresh gas or ACGO pipeline leak (occasional)
5. Circuit adapter or patient circuit damaged (occasional)

First check

Leak test of breathing system in mechanical ventilation mode

Test point: Breathing system circuit
Expected: No detectable pressure loss during test
Tools: As specified in section 3.7.2.2

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

O2 supply inlet assembly leaks patient safety

Pressure falls dramatically and continuously after O2 pipeline gas supply is turned off, indicating gas leakage

Ranked causes

1. O2 flush button assembly seal damaged or leaking (common)
2. System switch assembly seal damaged (common)
3. Vaporizer improperly installed or seal damaged (occasional)
4. Flowmeter or ORC assembly leaks (occasional)
5. Flow regulator or restrictor leaks (occasional)

First check

Observe pressure gauge reading trend after gas supply turned off

Test point: Test pressure gauge (downstream of inlet assembly)
Expected: Pressure should hold steady or fall slowly; not fall dramatically and continuously

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

Power system communication stopped caution

Lost communication with CPU board for 10 seconds. Power board cannot communicate with main processor.

Ranked causes

1. Communication cable failure or disconnection (common)
2. Power board software incorrect or needs update (occasional)
3. Power board processor reset required (occasional)
4. Power board failure (occasional)
5. CPU board failure (rare)

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

Anesthesia machine cannot start patient safety

System fails to start after power switch activation.

Ranked causes

1. System switch damaged (rare)
2. Cable disconnected from system switch (common)
3. Power board hardware circuit failure (occasional)
4. Power board software code error (occasional)

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

Battery not detected caution

Battery is not detected by the system. Battery voltage may be out of specification or cable connection is loose.

Ranked causes

1. Battery voltage out of specification (common)
2. Cable not connected correctly (common)
3. Defective battery (occasional)
4. Power board failure (occasional)

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

Breathing system accessories damaged or leaky patient safety

Manual bag, breathing tubes, Paw pressure gauge, or water collection cup show signs of damage or leakage

Ranked causes

1. Manual bag damaged (occasional)
2. Breathing tube damaged (occasional)
3. Paw pressure gauge seal damaged (occasional)
4. Water collection cup seal damaged (occasional)

First check

Visually inspect manual bag for damage

Test point: Manual bag surface
Expected: No visible tears, cracks, or defects

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

Breathing system leakage detected patient safety

Pressure reading falls below expected level during leak test; indicates faulty seals or connections in breathing system

Ranked causes

1. Breathing system leak in mechanical or manual ventilation mode (common)
2. Bellows housing or manual ventilation switch leak (occasional)
3. Circuit adapter pipeline leak (occasional)
4. Absorb canister assembly leakage (occasional)

First check

Perform leak test in manual ventilation mode

Test point: Paw pressure gauge
Expected: Pressure maintained at 30 cmH2O
Tools: O2 flow regulator, breathing tubes, Y piece

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

Calibration: 100% O2 patient safety

System calibration for oxygen sensor using 100% oxygen gas; failure indicated by fail code display or calibration not completing within ~3 minutes

Ranked causes

1. O2 sensor not connected (common)
2. O2 supply pressure insufficient (< 200 kPa) (common)
3. 21% O2 calibration not performed first (occasional)
4. O2 sensor count value out of normal range (450-2700) (occasional)

First check

Verify O2 sensor connection to cable

Test point: O2 sensor connector
Expected: Secure connection

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

Calibration: Flow sensor (Service) patient safety

Service-level flow sensor and inspiratory valve calibration using standard flow measurement device

Ranked causes

1. Ventilator control board replaced (common)
2. Drive gas assembly replaced (common)
3. Solenoid valve assembly replaced (common)
4. Flow sensor measurement deviation exceeds specification (occasional)

First check

Verify no sensor or valve technical alarms

Test point: Alarm display
Expected: No active sensor or valve alarms

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

Calibration: Pressure and Flow Zeroing Failure patient safety

Anesthesia machine unable to zero pressure and flow sensors during calibration; zeroing process fails to complete successfully.

Ranked causes

1. Sensor zero point out of range (occasional)
2. Sampling line occlusion or three-way valve mechanical fault (occasional)
3. Ventilator control board faulty (occasional)
4. Solenoid valve assembly faulty (occasional)

First check

Verify sensor zero point is within acceptable range

Test point: Pressure and flow sensors
Expected: Zero point normal per section 3.7.3

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

CO2 absorber canister not locked caution

CO2 absorber canister is not properly mounted or not detected

Ranked causes

1. Canister not properly seated (common)
2. Canister detection cable fault (occasional)
3. Ventilator control board failure (occasional)
4. Canister switch failure (occasional)

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

Error code [00 00 00 08] displayed - Inspiratory sensor zero point error patient safety

Inspiratory flow sensor zero reference point has shifted or is invalid

Ranked causes

1. Fresh gas not turned off preventing zero reference measurement (common)
2. Inspiratory valve has not fully closed blocking zero reference (occasional)
3. Zero point calibration is out of specification (occasional)
4. Inspiratory flow sensor or ventilator control board failure (occasional)

First check

Ensure fresh gas flow is turned completely off

Expected: Fresh gas supply off

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

Flow sensor zero drift or irregular waveform display patient safety

Flow measurement is inaccurate or waveform appears distorted on display; pressure sensor shows drift

Ranked causes

1. Flow sensor membrane distorted, dirty, or internal resistance changed (common)
2. Flow sensor assembly damaged (occasional)
3. Pressure sensor on fresh flow sensor board defective (occasional)
4. Flow sensor pressure sampling pipeline leak (common)

First check

Perform leak test of flow sensor pressure sampling pipeline (expiratory and inspiratory lines)

Test point: Flow sensor pressure sampling pipeline test fixture connectors
Expected: Pressure does not fall more than 5 cmH2O within 15 s at 70-90 cmH2O, within 15 s
Tools: Anesthesia machine calibration device, flow sensor pressure sampling pipeline test fixture, circuit adapter test fixture, injector, Φ6 silicone tube, Y piece

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

Gas leak in pneumatic circuit patient safety

Escaping gas detected in supply lines, connectors, or gas inlet assembly; audible hiss or pressure loss

Ranked causes

1. Gas supply tube damaged or seal at connection damaged (common)
2. Quick plug-in connector leaks (common)
3. Pipeline gas supply inlet assembly leaks (occasional)
4. Drive gas pipeline leaks (occasional)

First check

Inspect negative pressure ball for leaks before use

Test point: Front sealing cover and gas inlet
Expected: Ball does not visibly inflate for at least 30 seconds when finger blocks inlet

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

Heater ineffective or not heating patient safety

Unit does not reach or maintain set temperature; heater output insufficient; no heat felt at outlet

Ranked causes

1. Heater driver and control circuit on power board damaged (occasional)
2. Heater element damaged (occasional)
3. Heater internal sensor ineffective (occasional)
4. Heater cable disconnected or loose (common)

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

Inspiratory valve failure caution

Inspiratory valve voltage error or inspiratory valve flow error. Inspiratory flow sensor out of specification or valve assembly connection issue.

Ranked causes

1. Inspiratory flow sensor out of specification (common)
2. Voltage issue at test point or valve assembly connection (occasional)
3. Valve assembly failure (occasional)
4. Power board failure (rare)

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

Leak in gas supply system patient safety

Gas pressure not maintained or leakage detected in pipeline, connectors, or inlet assembly

Ranked causes

1. Gas supply tube is damaged or seal at connection is damaged (common)
2. Quick plug-in connector leaks (common)
3. Pipeline gas supply inlet assembly leaks (occasional)
4. Drive gas pipeline leaks (occasional)

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

Machine cannot start

Machine fails to start after power is applied

Ranked causes

1. System switch damaged (occasional)
2. Cable to system switch disconnected (common)
3. Power board hardware failure preventing voltage output (occasional)
4. Power board software error preventing voltage output (rare)

First check

Verify system switch cable connection

Test point: System switch connector
Expected: Cable properly seated

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

PEEP valve failure caution

PEEP valve voltage error or PEEP valve pressure error. Pressure sensor on PEEP circuit out of specification or valve assembly connection issue.

Ranked causes

1. Pressure sensor out of specification (common)
2. Voltage issue at test point or valve assembly connection (occasional)
3. Expiratory valve assembly failure (occasional)
4. Power board failure (rare)

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

Screen cannot be lit

Display screen remains off when machine powered on

Ranked causes

1. Cable to inverter disconnected (common)
2. Inverter damaged (occasional)
3. Power board hardware failure causing improper output (occasional)
4. Power board software failure causing improper output (rare)

First check

Verify inverter cable connection

Test point: Inverter connector
Expected: Cable properly seated

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

Screen does not light caution

Display not powered; no illumination or visual output when machine switched on

Ranked causes

1. Inverter cable disconnected or inverter damaged (occasional)
2. Power board hardware failure: improper output (occasional)
3. Power board software failure: improper output (occasional)
4. Screen power supply fuse burned: no 3.3V output (occasional)

First check

Verify screen power supply 3.3V output

Test point: Screen power supply output
Expected: 3.3V present at connector
Tools: Multimeter

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

3-way solenoid valve failure caution

Solenoid valve electrical signal control status error detected

Ranked causes

1. Solenoid valve connection fault (common)
2. Solenoid valve assembly failure (common)
3. Ventilator control board failure (occasional)

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

Aux Control Module communication stopped caution

Lost communication with CPU board for 10 seconds

Ranked causes

1. Communication cable defect or disconnection (common)
2. Ventilator Control Module Board failure (occasional)
3. CPU Board failure (occasional)

First check

Restart the machine

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

Aux control module selftest error on startup caution

Machine displays aux control module selftest error at power-on. CPU, Flash, watchdog timer error or communication failure between CPU and ventilator control board.

Ranked causes

1. Communication cable failure or disconnection (common)
2. Ventilator control board failure (occasional)
3. CPU board failure (occasional)

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

Battery in use - AC power lost patient safety

Unit is operating on battery power. AC mains supply has been disconnected or failed.

Ranked causes

1. AC power supply disconnected (common)
2. AC supply voltage out of specification (occasional)
3. Power board failure (occasional)

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

Calibration failure - No ventilation sound after Begin selected patient safety

System does not produce ventilation sound and fails immediately after Begin pressed

Ranked causes

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

First check

Verify Auto/Manual ventilation switch is in mechanical ventilation position, not bag

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

Calibration failure with no ventilation sound patient safety

After Begin is selected, no ventilation sound is heard and Calibration Failure message is displayed

Ranked causes

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

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

Calibration failure with ventilation sound heard patient safety

After Start is selected, ventilation sound heard then Calibration Failure message displayed

Ranked causes

1. Sensor sampling line not connected or reversed (common)
2. Inspiratory valve maximum flow below 90 L/min (occasional)
3. Pneumatic circuit, communication, or configuration error (occasional)

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

Calibration failure: Code [00 01 00 00]

Insufficient valve resolution during calibration process

Ranked causes

1. Insufficient gas supply for calibration (common)
2. Calibration device malfunction (occasional)
3. PEEP valve defective (occasional)

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

Calibration failure: communication error patient safety

Pressure calibration error [FF FF FF FF] displayed indicating communication error occurs.

Ranked causes

1. Transient communication fault (occasional)
2. Communication cable damage or poor connection (common)
3. Communication board failure (rare)

First check

Restart anesthesia machine

Test point: Machine power and startup
Expected: Machine restarts normally and enters standby

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

Calibration failure: No ventilation sound, immediate failure message patient safety

After Begin selected, no ventilation heard; failure message 'Calibration Failure! Please try again.' displays immediately

Ranked causes

1. Zero point error in airway pressure gauge or PEEP pressure sensor (common)
2. Sampling line not connected or improperly connected (common)
3. PEEP valve maximum pressure less than 95 cmH2O (occasional)

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

Calibration failure: unidirectional flow not achieved patient safety

Pressure calibration error [00 02 00 00] displayed indicating flow change is not unidirectional.

Ranked causes

1. Tubes connected incorrectly (common)
2. Insufficient gas supply (occasional)
3. Calibration device malfunction (occasional)

First check

Verify all pneumatic connections are correct

Test point: Pressure sampling lines and four-way device
Expected: Tubes connected per Figures 4-52 and 4-61; P1 to monitor board, P2 to PEEP, tube #72 connected, tube #9 unconnected

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

Calibration failure: valve resolution insufficient patient safety

Pressure calibration error [00 01 00 00] displayed indicating valve resolution is not adequate.

Ranked causes

1. Insufficient gas supply (occasional)
2. Calibration device malfunction (occasional)
3. Inspiratory valve defective (common)

First check

Verify gas supply pressure and flow

Test point: Gas supply inlet
Expected: Adequate supply for calibration process

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

Calibration failure: Ventilation sound heard, delayed failure message patient safety

After Begin selected, ventilation sound is heard; failure message appears after several seconds: 'Calibration Failure! Please try again.'

Ranked causes

1. Pneumatic circuit connection error between calibration device and ventilator control board (common)
2. Communication connection error between calibration device and machine (common)
3. Calibration device settings error (occasional)

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

Calibration: Flow sensor service calibration patient safety

Flow sensor and inspiratory valve calibration after equipment service or when measured flow deviation exceeds 5% of reading or 1 L/min

Ranked causes

1. Expiratory valve assembly replaced (occasional)
2. Ventilator control board replaced (occasional)
3. Flow measurement device reading deviation exceeds 5% or 1 L/min (occasional)

First check

Verify tubes are not leaking when connected

Test point: Calibration tube connections
Expected: No leaks detected

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

Calibration: Flow sensors (service level) patient safety

Service-level calibration of flow sensors and inspiratory valve after component replacement or when measured deviation exceeds threshold.

Ranked causes

1. Expiratory valve assembly replaced (occasional)
2. Ventilator control board replaced (occasional)
3. Ventilator flow sensor deviation exceeds 5% of reading or 1 L/min (occasional)

First check

Compare ventilator flow sensor reading with calibrated measurement device

Test point: Flow measurement comparison
Expected: Deviation within 5% of reading or 1 L/min (whichever greater), ±5% or ±1 L/min

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

Calibration: O2 sensor patient safety

O2 sensor calibration fails or produces out-of-range readings during 21% or 100% calibration steps

Ranked causes

2. O2 supply pressure insufficient (common)
3. 21% calibration not completed before 100% calibration (common)
4. O2 sensor defective or aged (occasional)

First check

Verify O2 sensor cable connection

Test point: O2 sensor connector
Expected: Alarm [O2 Sensor Unconnected] not displayed

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

Calibration: O2 sensor calibration patient safety

O2 sensor accuracy calibration at 21% (air) and 100% O2 when measurement deviation exceeds 3% or after sensor replacement

Ranked causes

1. O2 sensor measurement deviation exceeds 3% (occasional)
2. O2 sensor replaced (occasional)
3. Ventilator control board replaced (occasional)

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

Calibration: Pressure sensor service calibration patient safety

Pressure sensor and PEEP valve calibration after equipment service or when pressure measurement deviation exceeds 5% of reading or 2 cmH2O

Ranked causes

1. Ventilator control board replaced (occasional)
2. Expiratory valve assembly replaced (occasional)
3. Pressure sensor measurement deviation exceeds 5% or 2 cmH2O (occasional)

Calibration: Pressure sensors and PEEP valve patient safety

Airway pressure sensor, PEEP pressure sensor, and PEEP valve require calibration after replacing ventilator control board, drive gas assembly, or solenoid valve assembly, or when measured values deviate significantly from standard measurement device.

Ranked causes

2. Drive gas assembly replaced (common)
3. Solenoid valve assembly replaced (common)
4. Pressure sensor deviation from standard measurement device (occasional)

First check

Verify anesthesia machine is in standby mode

Test point: Machine mode
Expected: Standby mode

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Calibration: Pressure sensors and PEEP valve (service level) patient safety

Service-level calibration of pressure sensors and PEEP valve after component replacement or measurement deviation exceeds acceptable threshold.

Ranked causes

1. Ventilator control board replaced (occasional)
2. Expiratory valve assembly replaced (occasional)
3. Pressure sensor deviation exceeds 5% of reading or 2 cmH2O (occasional)

First check

Compare machine pressure sensor reading with standard pressure gauge

Test point: Pressure measurement comparison
Expected: Deviation within 5% of reading or 2 cmH2O (whichever greater), ±5% or ±2 cmH2O

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Calibration: System gas flow rates patient safety

O2, N2O, and AIR needle valve flow rates require calibration to meet specified ranges during anesthesia delivery

Ranked causes

1. O2 needle valve requires flow rate adjustment (common)
2. N2O resistor requires adjustment for correct flow rate (common)
3. AIR and N2O resistors on pneumatic block require adjustment (common)

First check

Measure O2 flow rate when N2O needle valve at maximum

Test point: O2 flow outlet
Expected: 0.25 to 0.3 L/min, 0.25–0.3 L/min

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

Error code [00 00 00 10] displayed - Expiratory sensor zero point error patient safety

Expiratory flow sensor zero reference point has shifted or is invalid

Ranked causes

1. Fresh gas not turned off preventing zero reference measurement (common)
2. Inspiratory valve has not fully closed blocking zero reference (occasional)
3. Zero point calibration out of specification (occasional)

First check

Verify fresh gas supply is turned off

Expected: Fresh gas flow zero

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Flow sensor failure caution

Ventilator flow sensor output is out of normal operating range. Sensor zero point or measurement is out of specification.

Ranked causes

1. Flow sensor zero point out of specification (common)
2. Flow sensor measurement out of specification (common)
3. Ventilator control board failure (occasional)

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

Flow sensor sampling line connection error

Flow sensor has two sampling lines; errors include backward connection, one line not connected, or both lines not connected

Ranked causes

1. Flow sensor sampling lines connected backward (occasional)
2. Flow sensor sampling line broken or not connected (occasional)
3. Flow sensor low-pressure sampling line not connected (occasional)

First check

Connect anesthesia machine tubes using constant-flow connection method

Test point: Pneumatic circuit
Expected: Tubes properly connected per constant-flow method

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

Flowmeter selftest error on startup caution

Machine displays flowmeter selftest error at power-on. CPU, Flash, watchdog timer error or communication failure between CPU and fresh flow sensor board.

Ranked causes

1. Communication cable failure or disconnection (common)
2. Fresh flow sensor board failure (occasional)
3. CPU board failure (occasional)

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More symptoms

Heater ineffective
Low battery voltage
Network connection fails
O2 concentration measurement fails or shows deviations
PEEP safety valve failure
Power board voltage error
System shutting down - battery depleted
Touch panel not responding to input
Unit does not power on
Unit does not power on, indicators and screen dark
Vaporizer manifold assembly leaks
Ventilator communication stopped
Ventilator initialization error on startup
Ventilator selftest error on startup
Ventilator voltage error
Alarm messages without sound
Bellows housing or manual ventilation switch leak
Breathing system leak in manual ventilation mode
Calibrate O2 sensor
Calibration failure after 15 minutes
Calibration failure after 15 minutes of operation
Calibration failure: ACGO switch in ON position
Calibration failure: communication interrupted
Calibration failure: EEPROM write failed
Calibration failure: No ventilation sound, immediate failure prompt
Calibration failure: output flow too low
Calibration: Electronic flowmeter zeroing
Calibration: Flow sensor (user)
Calibration: Flow sensor user calibration
Calibration: Flow sensors (user level)
Calibration: Pressure and flow zeroing
CGO assembly leak or connection failure
CGO assembly seal or connector damage
Check flow sensors reverse flow detected
CPU to infrared board communication fails
Drive gas pressure low
Error code [00 00 00 02] displayed - Drive gas pressure too low
Error code [00 00 00 20] displayed - Internal sensor zero point error
Error code [00 00 00 40] displayed - Inspiratory sensor measurement range error
Error code [00 00 00 80] displayed - Expiratory sensor measurement range error
Error code [00 00 01 00] displayed - Internal sensor measurement range error
Error code [00 00 02 00] displayed - Inspiratory sensor non-unidirectional data
Error code [00 00 04 00] displayed - Expiratory sensor non-unidirectional data
Error code [00 00 08 00] displayed - Internal sensor non-unidirectional data
Error code [00 00 10 00] displayed - Inspiratory sensor resolution error
Error code [00 00 20 00] displayed - Expiratory sensor resolution error
Error code [00 00 40 00] displayed - Internal sensor resolution error
Fan failure
Flow sensor assembly not installed properly
Flow sensor measurement error
Flowmeter assembly leaks gas
Flowmeter voltage error on startup
Inspiratory valve does not open adequately
Inspiratory valve does not open correctly
N2O flow out of range
No Drive Gas Pressure Low alarm when pressure is low
No gas output from valve in mechanical ventilation mode
No O2 Supply Failure alarm when pressure is low
O2 sensor disconnected
O2 supply failure
Patient circuit leak detected
PEEP safety valve does not open or PEEP valve malfunction
PEEP safety valve does not operate correctly
PEEP valve does not open or close correctly
PEEP valve opening state abnormal during Diagnostic Tests
Pinsp not achieved
Pipeline pressure gauge readings fluctuate greatly
Power board overheating
Pressure sensor measurement error
Screen displays content but image flashes
Screen flashes
Screen illuminated but displays no content
Screen lights but displays no content
Screen lights but no content displayed
System switch assembly leaks
System switch assembly or connecting tube damaged
Tidal volume not achieved
Ventilator voltage error on startup
3-way Valve Failure
Absorb canister assembly leak
AG airway occluded
AG calibration failure
AG communication failure
AG data limit error
AG hardware malfunction
AG initialization error
AG module hardware error
AG self-test failure
AG watertrap disconnected
AG watertrap requires replacement
AG watertrap type mismatch
AG zeroing failure
Air flow out of range
Air Flow Too High
AIR pipeline pressure gauge damaged
AIR pipeline pressure incorrect
AIR supply inlet assembly pressure drop excessive
AIR supply inlet assembly pressure out of specification
AIR supply inlet assembly regulator pressure out of specification
AIR supply pressure out of range
Airway pressure gauge defective
Airway pressure gauge inaccurate or pointer immobile
Airway pressure gauge shows inaccurate reading or pointer cannot move
APL valve pressure adjustment
Aux Control Module Comm Stop
Back pressure regulator leaks
Back pressure regulator leaks gas
Breathing Circuit Not Mounted
Calibration failure: Approximately 15 minutes after start
Calibration failure: Code [00 00 40 00]
Calibration failure: Code [00 00 80 00]
Calibration failure: Code [FF FF FF FF]
Calibration failure: Delay approximately 15 minutes after start
Calibration: 21% O2
Calibration: AG Module
Calibration: Cylinder yoke regulator pressure
Calibration: Electronic flowmeter zeroing (user level)
Calibration: O2 sensor at 100% O2
Calibration: O2 sensor at 21% O2
Calibration: ORC oxygen-nitrous oxide ratio control
Calibration: ORC Oxygen/Nitrous Oxide Ratio Control
Calibration: Pressure and flow zeroing (service level)
Calibration: Pressure sensors and PEEP proportional valve
Cannot exit standby mode
Check Flow Sensors
CO2 measurement accuracy unspecified
Desflurane measurement accuracy unspecified
Drive gas pipeline leak in circuit adapter
Drive gas pressure alarm incorrect or missing
Drive Gas Pressure Low alarm does not occur at 0.05 MPa
Drive Gas Pressure Low alarm incorrect trigger or no alarm when pressure low
Drive Gas Pressure Low alarm not triggered
Drive gas pressure low alarm not triggered at expected pressure
Drive Gas Pressure Low alarm occurs at wrong threshold
Drive Gas Pressure Low alarm occurs when pressure is normal
Drive gas pressure low alarm triggered at wrong pressure
End-tidal desflurane measurement overrange
End-tidal enflurane measurement overrange
End-tidal halothane measurement overrange
End-tidal isoflurane measurement overrange
End-tidal N2O measurement overrange
End-tidal O2 measurement overrange
End-tidal sevoflurane measurement overrange
Enflurane measurement accuracy unspecified
Error code [00 00 00 04] displayed - Manual ventilation switch issue
Exiting Standby fails
Expired CO2 measurement overrange
External AG module disconnected
Flow sensor calibration data incorrect
Flow sensor calibration failure
Flow sensor leaks
Flow sensor leaks gas
Flow sensor low pressure sampling line disconnected
Flow sensor measurement error or calibration data incorrect
Flow sensor sampling lines broken or disconnected
Flow sensor sampling lines connected backward
Flow sensor zero point outside specifications
Flowmeter assembly leaks
Flowmeter Comm Stop
Flowmeter Voltage Error
Fresh gas pipeline leak in circuit adapter
Gas delivery system leak detected
Gas mixer leaks
Gas mixer leaks gas
Halothane measurement accuracy unspecified
Heating Module Failure
Incompatible AG module software version
Insp Valve Failure
Inspiratory valve opening defective or inadequate flow
Inspired CO2 measurement overrange
Inspired desflurane measurement overrange
Inspired enflurane measurement overrange
Inspired halothane measurement overrange
Inspired isoflurane measurement overrange
Inspired N2O measurement overrange
Inspired O2 measurement overrange
Inspired sevoflurane measurement overrange
Internal Air Flow Failure
Internal N2O Flow Failure
Internal O2 Flow Failure
IP address conflict
Isoflurane measurement accuracy unspecified
Leak in gas delivery system
Mixed halogenated agents detected (low MAC)
Mixed halogenated agents with high MAC
Mixed halogenated agents with invalid reading
N2O Flow Too High
N2O measurement accuracy unspecified
Needle valve leaks
Needle valve leaks gas
Network connection failed
NO Fresh Gas
O2 concentration measurement fails or has great deviations
O2 flow out of range
O2 Flow Too High
O2 flush button assembly leaks
O2 measurement accuracy unspecified
O2 pressure switch does not trigger O2 Supply Failure alarm at 0.25 MPa
O2 sensor calibration failure
O2 sensor error
O2 supply alarm incorrect or missing
O2 Supply Failure alarm incorrect trigger or no alarm when pressure low
O2 Supply Failure alarm not triggered
O2 supply failure alarm not triggered at expected pressure
O2 Supply Failure alarm occurs at wrong threshold
O2 Supply Failure alarm occurs when pressure is normal
O2 supply failure alarm triggered at wrong pressure
O2 supply inlet assembly pressure out of specification
O2 supply inlet assembly regulator pressure out of specification
O2-N2O Ratio Error
Oxygen Ratio Controller (ORC) damaged
Oxygen Ratio Controller (ORC) leaks
Patient Circuit Leak
PEEP safety valve opening defective when drive gas pressure low
PEEP valve does not operate correctly
PEEP valve opening defective in mechanical ventilation
Pipeline pressure gauge reads inaccurately or shows no reading
Pipeline pressure gauge shows inaccurate readings or no readings
Power supply voltage error on startup
Pressure sensor calibration data incorrect
Pressure sensor calibration failure
Pressure sensor measurement error or calibration data incorrect
Pressure sensor sampling line connected incorrectly
Pressure sensor sampling line connection error
Pressure sensor sampling line not connected
Pump rate overrange
Real-time clock failure
Real-time clock needs battery
Replace O2 sensor
Screen lights with content but flashes repeatedly
Sensor zero point out of specification
Sevoflurane measurement accuracy unspecified
Standby mode exit fails
Total flowmeter assembly leaks
Total flowmeter leaks
Touch panel ineffective
Ventilation stops during operation
Ventilation stops suddenly but display and buttons work
Ventilation stops suddenly during operation
Ventilator Comm Stop
Vt Not Achieved

241 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	Gas supply pressure insufficient during calibration	error
`00 00 00 02`	Drive gas pressure too low	Pressure below threshold during calibration initialization	error
`00 00 00 02`	O2 supply pressure is low during 100% calibration process	O2 supply pressure was not sufficient during 100% calibration step	error
`00 00 00 04`	Auto/Manual switch in Manual position	Auto/Manual switch detected in Manual mode during calibration	error
`00 00 00 04`	O2 sensor is disconnected; sampled data exceeds 2900 (AD value)	Sampled AD value greater than 2900 indicates sensor open circuit or very high impedance	error
`[00 00 00 04]`	Auto/Manual switch in wrong position	Auto/Manual switch positioned to Manual during calibration	warning
`[00 00 00 08]`	Airway pressure sensor zero point error	Zero point calibration failed for airway pressure sensor	error
`00 00 00 08`	Airway pressure sensor zero point error	Airway pressure sensor zero point outside acceptable range	error
`00 00 00 08`	21% calibration value is outside expected range 150~500 (AD value)	21% O2 calibration step produced reading below 150 or above 500	error
`[00 00 00 08]`	Inspiratory flow sensor zero point error	Sensor zero point AD greater than or equal to 2000 or less than 0	error
`00 00 00 10`	PEEP pressure sensor zero point error	PEEP pressure sensor zero point outside acceptable range	error
`[00 00 00 10]`	Expiratory flow sensor zero point error	Sensor zero point AD greater than or equal to 2000 or less than 0	error
`[00 00 00 10]`	PEEP pressure sensor zero point error	Zero point calibration failed for PEEP pressure sensor	error
`00 00 00 10`	100% calibration value is outside expected range 800~2028 (AD value)	100% O2 calibration step produced reading below 800 or above 2028	error
`00 00 00 20`	Airway pressure sensor measurement range error	Airway sensor reading outside acceptable measurement range	error
`00 00 00 20`	Error writing to EEPROM memory	System unable to write calibration data to EEPROM storage during calibration completion	critical
`[00 00 00 20]`	Measurement range error in airway pressure sensor	Airway pressure sensor output exceeds or cannot reach expected measurement range	error
`[00 00 00 20]`	Airway pressure sensor measurement range error	Sensor unable to achieve full measurement range during calibration	error
`[00 00 00 40]`	Measurement range error in inspiratory flow sensor	Inspiratory flow sensor reading exceeds valid measurement range during calibration	error
`00 00 00 40`	PEEP pressure sensor measurement range error	PEEP sensor reading outside acceptable measurement range	error
`[00 00 00 40]`	PEEP pressure sensor measurement range error	Sensor unable to achieve full measurement range during calibration	error
`[00 00 00 80]`	Expiratory flow sensor measurement range error	Sensor AD value greater than 3900 at 90 L/min flow	error
`[00 00 00 80]`	Airway pressure sensor calibration data not unidirectional	Calibration data shows non-linear or backward response during pressure sweep	error
`[00 00 00 80]`	Measurement range error in expiratory flow sensor	Expiratory flow sensor reading exceeds valid measurement range during calibration	error
`00 00 00 80`	Airway pressure sensor calibration data not unidirectional	Calibration data shows non-linear or inconsistent response	error
`[00 00 01 00]`	Internal flow sensor measurement range error	Sensor AD value greater than 3900 at 45 L/min flow	error
`00 00 01 00`	PEEP pressure sensor calibration data not unidirectional	Calibration data shows non-linear or inconsistent response	error
`[00 00 01 00]`	PEEP pressure sensor calibration data not unidirectional	Calibration data shows non-linear or backward response during pressure sweep	error
`00 00 02 00`	Airway pressure sensor resolution error	Sensor resolution insufficient for accurate measurement	error
`[00 00 02 00]`	Airway pressure sensor resolution error	Insufficient sensor resolution; difference between max and min AD <= 500 or single-point resolution < 1 cmH2O	error
`[00 00 02 00]`	Inspiratory flow sensor calibration data not unidirectional	Calibration data does not show expected unidirectional behavior	error
`[00 00 04 00]`	Expiratory flow sensor calibration data not unidirectional	Calibration data does not show expected unidirectional behavior	error
`[00 00 04 00]`	PEEP pressure sensor resolution error	Insufficient sensor resolution; difference between max and min AD <= 500 or single-point resolution < 1 cmH2O	error
`00 00 04 00`	PEEP pressure sensor resolution error	Sensor resolution insufficient for accurate measurement	error
`00 00 08 00`	Valve output pressure too low	PEEP valve output pressure below acceptable threshold	error
`[00 00 08 00]`	Valve output pressure low	PEEP valve unable to generate sufficient output pressure	error
`[00 00 08 00]`	Calibration data of internal flow sensor is not unidirectional	Calibration system detects bidirectional flow or inconsistent data trend in internal sensor	error
`00 00 10 00`	Flow change not unidirectional	Flow measurement shows non-linear or inconsistent response during calibration	error
`[00 00 10 00]`	Resolution error in inspiratory flow sensor	Sensor resolution does not meet calibration requirements	error
`[00 00 10 00]`	Change of flow is not unidirectional	Flow measurement shows non-monotonic or bidirectional behavior during calibration	error
`[00 00 20 00]`	Resolution error in expiratory flow sensor	Sensor resolution does not meet calibration requirements	error
`00 00 20 00`	Communication with calibration device interrupted	Loss of communication with external calibration device	error
`[00 00 20 00]`	Communication with calibration device is interrupted	Data exchange between calibration device and machine stops or becomes unreliable	error
`00 00 40 00`	System fails to write EEPROM	Data write to non-volatile memory unsuccessful	error
`[00 00 40 00]`	EEPROM write failure	During calibration process	error
`[00 00 40 00]`	Resolution error in internal flow sensor	Internal flow sensor resolution insufficient or unstable during calibration	error
`[00 00 40 00]`	System fails to write EEPROM	EEPROM write operation failed during calibration data save	error
`[00 00 80 00]`	Output flow of valve is low	Valve output flow during calibration is less than specified	error
`00 00 80 00`	ACGO switch in ON position	ACGO (automatic calibration gas outlet) switch detected in ON mode	error
`[00 00 80 00]`	ACGO switch in ON position	Auto-calibration gas outlet switch activated during service calibration	warning
`[00 01 00 00]`	PEEP valve resolution insufficient	Valve control resolution inadequate for fine pressure control	error
`00 01 00 00`	Valve resolution insufficient	PEEP valve resolution inadequate for precision calibration	error
`[00 02 00 00]`	Change of flow is not unidirectional	Flow changes exhibit bidirectional behavior during calibration	error
`[00 02 00 00]`	Maximum valve pressure not found	Valve unable to reach specified maximum pressure during diagnostic sweep	error
`[00 04 00 00]`	Minimum valve pressure not found	Valve unable to reach specified minimum pressure during diagnostic sweep	error
`[00 04 00 00]`	Communication with calibration device interrupted	Communication link between machine and calibration device fails	error
`[00 08 00 00]`	System fails to write EEPROM	EEPROM write operation fails during calibration	error
`[00 10 00 00]`	ACGO switch positioned to ON	ACGO switch detected in ON position during calibration	error
`[00 20 00 00]`	Maximum value cannot be found	Calibration algorithm cannot determine maximum flow point	warning
`[00 40 00 00]`	Minimum value cannot be found	Calibration algorithm cannot determine minimum flow point	warning
`3-way Valve Failure`	Three-way solenoid valve malfunction	Solenoid valve electrical signal control status error	info
`AG Airway Occluded`	AG sampling airway occluded	Pump rate drops below 20 ml/min for >1 second	critical
`AG Cal. Failed`	AG module calibration failed	AG calibration procedure unsuccessful	critical
`AG Change Watertrap`	AG watertrap service interval expired	Watertrap has reached service life limit	error
`AG Comm Stop`	AG module communication failure	Loss of communication with AG module	critical
`AG Data Limit Error`	AG module data transmission error	AG module data integrity check fails	error
`AG Hardware Error`	AG hardware error detected	AG module hardware malfunction	error
`AG Hardware Malfunction module`	AG module hardware malfunction	AG module improper installation or hardware fault	critical
`AG Init Error`	AG module initialization error	AG module fails to initialize on startup	critical
`AG No Watertrap`	AG module watertrap disconnected	Watertrap not detected when system initializes	error
`AG Watertrap Type Wrong`	AG watertrap type does not match patient type	Adult watertrap installed when patient type set to infant	error
`AG Zero Failed`	AG module zeroing procedure failed	AG module cannot zero sensor output	warning
`Air Flow Too High`	Air flow exceeds maximum threshold	Air flow greater than 20 L/min for 1 second	info
`Auto Ventilation Disabled`	Automatic ventilation disabled due to system self-test failure	System self-test failure during initialization	info
`Auto Ventilation Disabled - Leak Test Failed`	Automatic ventilation disabled due to circuit leak test failure	Automatic circuit leak test failure during initialization	info
`Auto Ventilation is Non-Functional`	Automatic ventilation non-functional while switch in Auto position	Auto/Manual switch in Auto position but automatic ventilation not functional	error
`Aux Control Module Comm Stop`	Communication loss between auxiliary control module and CPU board	Lost communication with CPU board for 10 seconds	error
`Aux Control Module Selftest Error`	Auxiliary ventilator control module failed self-test during startup	CPU communication failure or board internal error at power-on	error
`Aux Control Module Selftest Error`	Auxiliary control module self-test failed. CPU, Flash, or watchdog timer error, or communication loss with ventilator control board	Power-on	critical
`Battery in Use`	Operating on battery power due to AC failure	AC power failure detected	info
`Battery Undetected`	Battery is not detected by the system	Power-on or runtime	warning
`Breathing Circuit Not Mounted`	Breathing circuit not properly installed	Breathing circuit detection sensor indicates circuit not mounted	error
`Bundle Version Error`	Software versions are not compatible	Incompatible software versions detected at startup	error
`Calibrate Flow Sensor and Insp Valve`	Flow sensor calibration table missing or corrupted	Calibration table not found in EEPROM or checksum mismatch	info
`Calibrate Flow Sensor and Insp Valve`	Calibration table not found in EEPROM or checksum mismatch for flow sensor and inspiratory valve	Power-on or runtime	info
`Calibrate O2 Sensor`	O2 sensor calibration table missing or corrupted in EEPROM	EEPROM calibration data lost or checksum mismatch at startup	warning
`Calibrate O2 Sensor`	Calibration table not found in EEPROM or checksum mismatch for oxygen sensor	Power-on or runtime	info
`Calibrate Pressure Sensor and PEEP Valve`	Pressure sensor calibration table missing or corrupted in EEPROM	EEPROM calibration data lost or checksum mismatch at startup	warning
`Calibrate Pressure Sensor and PEEP Valve`	Calibration table not found in EEPROM or checksum mismatch for pressure sensor and PEEP valve	Power-on or runtime	info
`Check Flow Sensors`	Flow sensor measurement error detected	Inspiratory reverse flow OR expiratory reverse flow detected	error
`CO2 Absorber Canister Not Locked`	CO2 absorber canister not properly mounted	CO2 canister mounting detection sensor indicates canister not mounted	error
`CO2 Accuracy Unspecified`	CO2 measurement outside module accuracy range	Measured CO2 concentration exceeds specification	warning
`Des Accuracy Unspecified`	Desflurane measurement outside module accuracy range	Measured desflurane concentration exceeds specification	warning
`[Drive Gas Pressure Low]`	Drive gas (O2) pressure is lower than 200 kPa	Drive gas supply pressure falls below threshold during calibration initiation	error
`Drive Gas Pressure Low`	Drive gas (O2) pressure to expiratory valve assembly is below safe operating limit	O2 supply pressure falls below pressure switch threshold (~0.2 MPa / 2.0 bar)	warning
`Drive Gas Pressure Low`	Drive gas (expiratory valve) pressure is below minimum threshold; alarm triggered by expiratory valve pressure switch	Expiratory valve integrated pneumatic circuit pressure falls below 0.2 MPa (nominal switch point ~220 kPa)	critical
`Enf Accuracy Unspecified`	Enflurane measurement outside module accuracy range	Measured enflurane concentration exceeds specification	warning
`EtCO2 Overrange`	End-tidal CO2 measurement exceeds module range	EtCO2 concentration above maximum measurable value	warning
`EtDES Overrange`	End-tidal desflurane measurement exceeds module range	EtDES concentration above maximum measurable value	warning
`EtENF Overrange`	End-tidal enflurane measurement exceeds module range	EtENF concentration above maximum measurable value	warning
`EtHAL Overrange`	End-tidal halothane measurement exceeds module range	EtHAL concentration above maximum measurable value	warning
`EtISO Overrange`	End-tidal isoflurane measurement exceeds module range	EtISO concentration above maximum measurable value	warning
`EtN2O Overrange`	End-tidal N2O measurement exceeds module range	EtN2O concentration above maximum measurable value	warning
`EtO2 Overrange`	End-tidal O2 measurement exceeds module range	EtO2 concentration above maximum measurable value	warning
`EtSEV Overrange`	End-tidal sevoflurane measurement exceeds module range	EtSEV concentration above maximum measurable value	warning
`External AG Module Disconnected`	External AG module not connected to system	FDA version expects external AG but module not found	critical
`External AG Self Test Error`	External anesthetic gas module self-test failure	External AG module selftest malfunction	info
`Fan Failure`	System fan speed below minimum threshold	Fan speed 20% off nominal value (normal ~4000 RPM)	warning
`Fan Failure`	Cooling fan speed 20% below nominal rotation speed	Fan speed monitoring indicates speed deviation	warning
`Fan Failure 02`	Module rack fan speed below minimum threshold	Module rack fan speed less than 3640 RPM (normal ~4000 RPM)	warning
`[FF FF FF FF]`	Communication error	Communication protocol or CRC error with control board or calibration device	critical
`FF FF FF FF`	Communication error	General communication failure between system components	critical
`FiCO2 Overrange`	Inspired CO2 measurement exceeds module range	FiCO2 concentration above maximum measurable value	warning
`FiDES Overrange`	Inspired desflurane measurement exceeds module range	FiDES concentration above maximum measurable value	warning
`FiENF Overrange`	Inspired enflurane measurement exceeds module range	FiENF concentration above maximum measurable value	warning
`FiHAL Overrange`	Inspired halothane measurement exceeds module range	FiHAL concentration above maximum measurable value	warning
`FiISO Overrange`	Inspired isoflurane measurement exceeds module range	FiISO concentration above maximum measurable value	warning
`FiN2O Overrange`	Inspired N2O measurement exceeds module range	FiN2O concentration above maximum measurable value	warning
`FiO2 Overrange`	Inspired O2 measurement exceeds module range	FiO2 concentration above maximum measurable value	warning
`FiSEV Overrange`	Inspired sevoflurane measurement exceeds module range	FiSEV concentration above maximum measurable value	warning
`Flowmeter Comm Stop`	Communication loss between flowmeter and CPU board	Lost communication with CPU board for 10 seconds	error
`Flowmeter Selftest Error`	Fresh flow sensor board failed internal self-test during startup	CPU communication failure or board internal error at power-on	error
`Flowmeter Selftest Error`	Flowmeter self-test failed during startup. CPU, Flash memory, or watchdog timer error, or communication failure with sensor board	Power-on	critical
`Flowmeter Voltage Error`	Electronic flowmeter voltage (DVCC, AVDD or VC) is out of specification	Power-on or runtime	critical
`Flowmeter Voltage Error`	Voltage error on digital voltage supply channels (DVCC, AVDD or VC)	Power supply or communication failure to fresh flow sensor board	error
`Flow Sensor Failure`	Ventilator flow sensor output is out of normal operating range	Runtime	info
`Hal Accuracy Unspecified`	Halothane measurement outside module accuracy range	Measured halothane concentration exceeds specification	warning
`Heating Module Failure`	Heating element temperature out of specification	Heating resistance temperature abnormal for extended period	error
`Incompatible AG Software Version`	AG module software version too old	AG module software version < 1.7.3	critical
`Insp Valve Failure`	Inspiratory valve malfunction	Inspiratory valve voltage error or inspiratory valve flow error	warning
`Insp Valve Failure`	Inspiratory valve has voltage error or flow sensor error	Runtime	warning
`Internal Air Flow Failure`	Communication failure between flowmeter CPU and Air flow sensor	Communication failure between flowmeter CPU and Air sensor for 3 seconds continuously	info
`Internal N2O Flow Failure`	Communication failure between flowmeter CPU and N2O flow sensor	Communication failure between flowmeter CPU and N2O sensor for 3 seconds continuously	info
`Internal O2 Flow Failure`	Communication failure between flowmeter CPU and O2 flow sensor	Communication failure between flowmeter CPU and O2 sensor for 3 seconds continuously	info
`IP Address Conflict`	Device IP address duplicated on local network	IP address matches another device on same network	warning
`IP Address Conflict`	IP address is the same as another machine on the network	Power-on or runtime	warning
`Iso Accuracy Unspecified`	Isoflurane measurement outside module accuracy range	Measured isoflurane concentration exceeds specification	warning
`Keyboard Self Test Error`	Keyboard malfunction detected	Keyboard self-test timeout during startup	error
`Leak`	Gas delivery system leak detected in one or more assemblies	Continuous pressure drop detected during system test or operation	error
`Low Battery Voltage!`	Battery voltage critically low	Battery voltage less than 10.6V for 5 seconds	error
`[Manual Vent.]`	Auto/Manual ventilation switch is in wrong position	Calibration system detects Auto/Manual switch set to bag position instead of mechanical ventilation	error
`Mixed Agent`	Two halogenated anesthetic agents detected with low combined MAC	MAC < 3 with two halogenated agents monitored	warning
`Mixed Agent and MAC≥3`	Two halogenated anesthetic agents with high combined MAC	MAC >= 3 with two halogenated agents monitored	error
`N2O Accuracy Unspecified`	N2O measurement outside module accuracy range	Measured N2O concentration exceeds specification	warning
`N2O Flow Too High`	Nitrous oxide flow exceeds maximum threshold	N2O flow greater than 15 L/min for 1 second	info
`NO Fresh Gas`	Fresh gas flow below minimum threshold	Fresh gas flow less than 50 mL/min	warning
`NO Fresh Gas`	Fresh gas flow insufficient for ventilation	Fresh gas flow less than 50 mL/min	warning
`O2 Accuracy Unspecified`	O2 measurement outside module accuracy range	Measured O2 concentration exceeds specification	warning
`O2 Flow Too High`	Oxygen flow exceeds maximum threshold	O2 flow greater than 25 L/min for 1 second	info
`O2-N2O Ratio Error`	Oxygen-nitrous oxide ratio out of specification	N2O > 0.5 L/min AND N2O > 4x O2 flow for 1.6 seconds	error
`O2 Sensor Disconnected`	Oxygen sensor not connected	O2 sensor disconnected from cable	info
`O2 Sensor Error`	O2 sensor error detected	O2 sensor malfunction	error
`O2 Supply Failure`	O2 supply pressure to machine is below safe operating minimum	O2 supply pressure falls below pressure switch threshold (~0.25 MPa / 2.5 bar)	error
`O2 Supply Failure`	Oxygen supply failure or insufficient pressure	O2 pressure switch detects inadequate oxygen supply	error
`Patient Circuit Leak`	Breathing circuit or patient connection leak detected	Pressure < 2 cmH2O for 30 seconds during mechanical ventilation OR patient not connected	warning
`PEEP Safety Valve Failure`	PEEP safety valve electrical fault	PEEP safety valve voltage error	warning
`PEEP Valve Failure`	Positive end-expiratory pressure valve malfunction	PEEP valve voltage error or PEEP valve pressure error	warning
`Pinsp Not Achieved`	Inspiratory pressure not achieved	In pressure mode, Pinsp < 2/3 of setting (if >9 cmH2O) or < setting-3 cmH2O (if <9 cmH2O) for 6 cycles	info
`Power Board High Temp`	Power board temperature exceeds 95 degrees Celsius	Runtime	critical
`Power Supply Voltage Error`	Power board output voltage (3.3V, 5V, or 12V) is out of specification	Power-on or runtime	critical
`Power Supply Voltage Error (Runtime)`	3.3V, 5V, or 12V supply voltage out of specification during operation	Power board detects output voltage out of range	error
`Power System Comm Stop`	Communication loss between power board and CPU board	Lost communication with CPU board for 10 seconds	error
`Rate Overrange`	Pump rate measurement exceeds module range	Measured pump rate above maximum specification	warning
`Replace O2 sensor`	Oxygen sensor reading critically low	O2 value less than 5%	warning
`RT Clock Failure`	Real-time clock chip malfunction	RT chip malfunction detected	error
`RT Clock Needs Battery`	Real-time clock backup battery is missing or depleted	Power-on or runtime	critical
`Sev Accuracy Unspecified`	Sevoflurane measurement outside module accuracy range	Measured sevoflurane concentration exceeds specification	warning
`System going DOWN, Battery depleted!`	Battery voltage critically low; system shutting down	Battery voltage less than 10.2V at power-on	critical
`System going DOWN, Battery depleted!`	System shutdown imminent due to battery depletion	Battery voltage less than 10.2V	critical
`Ventilator Comm Stop`	Communication loss between ventilator board and CPU board	Lost communication with CPU board for 10 seconds	error
`Ventilator Initialization Error`	Ventilator control board did not receive parameter settings at power-on	CPU to ventilator communication failure during initialization	error
`Ventilator Initialization Error`	CPU board cannot send parameter settings to ventilator control board at power-on	Power-on	critical
`Ventilator Initialization Error`	Ventilator parameter initialization timeout	CPU board cannot send parameter settings to ventilator board after power on	error
`Ventilator Selftest Error`	Ventilator control board failed internal self-test during startup	CPU communication failure or board internal error at power-on	error
`Ventilator Selftest Error`	Ventilator self-test failed. CPU, timer, RAM, watchdog, EEPROM or ADC error, or communication loss with ventilator control board	Power-on	critical
`Ventilator Voltage Error`	Ventilator control module power supply voltage (5V or 12V) is out of specification	Power-on or runtime	critical
`Ventilator Voltage Error`	5V or 12V supply voltage out of specification to ventilator control module	Power board output voltage failure	error
`Vt Not Achieved`	Tidal volume not achieved	Tidal volume < TV setting for 6 cycles for >20% or 50 mL (whichever greater)	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.