Welch Allyn Propaq CS: troubleshooting and error codes
The ServiceForge knowledge base holds 53 documented symptoms for the Welch Allyn Propaq CS, with 61 ranked causes, 116 diagnostic checks with test points and expected values, and 25 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI
Symptoms
Sidestream CO2 assemblies require replacement caution
SSP Board, Stick Board, or Extender Board replacement in Expansion Module for Sidestream CO2 option
Ranked causes
- 1. Worn or failed Sidestream CO2 components (unknown)
- 2. SSP or Stick Board failure (unknown)
- 3. Board reassembly required (common)
Visually inspect Extender Board for damage or corrosion
- Test point
- Extender Board, P6 connector
- Expected
- No visible damage, clean connections
9 more checks with pass and fail actions, 6 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Air leak in NIBP cuff fitting patient safety
Air system leakage from NIBP cuff connection causing inaccurate or failed measurements
Ranked causes
- 1. Worn or damaged O-ring gasket in cuff fitting (common)
- 2. Pinched or cracked cuff hose (occasional)
Visual inspection of O-ring gasket for wear or damage
- Test point
- Cuff fitting O-ring
- Expected
- O-ring intact and properly seated
1 more check with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Analog board removal and reinstallation high voltage
Procedure to remove analog board from front chassis for service or replacement
Ranked causes
- 1. Scheduled replacement or repair of analog board (common)
- 2. Reinstall analog board (common)
Expose power connector on control board
- Test point
- 4-wire cable in middle of control board
- Expected
- Power connector visible and accessible
4 more checks with pass and fail actions, 3 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Calibration: Functional verification of Propaq CS monitor patient safety
Comprehensive functional verification procedure to confirm proper operation of Propaq CS monitor and options without disassembly. Supports routine preventive maintenance. Service Menus access internal software routines for testing NIBP, display, invasive pressure, and printer channels.
Ranked causes
- 1. Post-calibration verification required (common)
- 2. Post-circuit board replacement verification (occasional)
Verify power-up self-test completion
- Test point
- Monitor startup
- Expected
- All software and hardware tests successful, monitor ready for use
4 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
ECG/RESP waveform not displayed correctly patient safety
Monitor fails to display normal sinus rhythm ECG or respiration waveform with correct heart rate and respiration rate
Ranked causes
- 1. ECG lead disconnected or improperly connected (common)
- 2. Patient simulator not configured correctly (occasional)
Patient simulator configuration
- Test point
- Patient simulator display settings
- Expected
- ECG waveform normal sinus rhythm, rate 80 bpm, size 1 mV, Resp Lead I, baseline 1 KΩ, rate 40 br/m, amplitude 1.0Ω
3 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Monitor battery does not charge
The monitor battery fails to charge when AC power adapter is connected and functioning. Battery does not hold adequate charge.
Ranked causes
- 1. Fuse F1 open protecting dc input (common)
- 2. Battery pack no longer holds adequate charge (common)
Verify AC power adapter is functioning properly
- Test point
- AC power adapter input
- Expected
- AC adapter functional and supplying power
2 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
NIBP pump leakage exceeds specification
After 4 minutes of pump test with neonatal cuff, displayed leakage exceeds 50 mm Hg specification
Ranked causes
- 1. Air leak in external hoses or fittings (common)
- 2. Internal air leak in pump or transducer (occasional)
After 4 minutes of pump inflation, measure displayed leakage
- Test point
- Leakage display in PUMP TEST mode
- Expected
- <50 mm Hg, Less than specification
2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
Battery drained causing settings loss
Program fault with settings lost and time/day reset at startup
Ranked causes
- 1. Battery depleted or dead (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Battery not charging and green LED indicator not illuminating
The green LED charging indicator on the monitor's right side panel does not illuminate and the monitor battery does not charge when AC power adapter is connected and functioning properly.
Ranked causes
- 1. Fuse F1 open or failed (common)
Inspect fuse F1 for continuity or visible damage
- Test point
- Fuse F1 at dc input connector
- Expected
- Fuse intact with no visible damage; continuity present
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Cable continuity compromised caution
Cable fails continuity testing on one or more pins; signal not transmitted or intermittent
Ranked causes
- 1. Cable conductor break or corrosion (occasional)
Check cable continuity on all pins using DMM
- Test point
- All cable pins
- Expected
- Continuity on all pins; < 1 ohm resistance
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Cable suspected faulty
Cable continuity failure on one or more pins; requires replacement
Ranked causes
- 1. Cable continuity failure (unknown)
Check cable continuity on all pins
- Test point
- All cable pins
- Expected
- Continuity present on all pins
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Cabling and connector routing during side panel installation
Bundle of cabling with bead must be routed correctly so connectors extend out of Rear Chassis properly
Ranked causes
- 1. Improper cable routing during installation (occasional)
Verify cabling is routed under temperature connector housing
- Test point
- Cable bundle and temperature connector housing
- Expected
- Bundle routed under temperature connector housing with connectors extending from bottom of Chassis
1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Calibration: Invasive Blood Pressure channel P2 patient safety
Verify or adjust second IBP channel P2 to read 200 ±2 mmHg using blood pressure simulator
Ranked causes
- 1. P2 channel requires verification or adjustment (occasional)
Verify P2 displays 200 ±2 mmHg after zeroing and setting simulator
- Test point
- P2 display on monitor screen
- Expected
- 200 ±2 mmHg, ±2 mmHg
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Calibration: Monitoring parameter circuits patient safety
Monitor does not pass functional verification; calibration or repair required
Ranked causes
- 1. Monitoring parameter circuits out of calibration (unknown)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Calibration: MSP Board (MCO2) barometric pressure
Monitor displays barometric pressure that requires calibration adjustment to meet specification limits.
Ranked causes
- 1. Barometric pressure reading outside calibration limits (unknown)
Observe displayed barometric pressure on monitor CO2 TEST MAIN TEST screen
- Test point
- Monitor display
- Expected
- Within 3 mmHg of local barometric pressure
2 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Calibration: MSP Board electromagnetic interference emissions
RP2 null adjustment for electromagnetic interference emissions control.
Ranked causes
- 1. Electromagnetic interference emissions calibration required (unknown)
Connect oscilloscope probe to TP50 on MSP Board
- Test point
- TP50
- Expected
- Probe ground tip left open, 1X probe configuration
- Tools
- Oscilloscope with 1X probe
1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Calibration: Realtime ECG Output
ECG signal output level adjustment on Propaq CS monitor to ensure correct waveform amplitude.
Ranked causes
- 1. ECG output requires calibration adjustment (unknown)
Set simulator parameters
- Test point
- Simulator output
- Expected
- 80 bpm, normal sinus rhythm
5 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Calibration: Recharger supply adjustments high voltage
Adjustment of voltage regulators RP5, RP3, and RP1 on Recharger Board to maintain proper battery charging voltage and overvoltage protection limits across input voltage range.
Ranked causes
- 1. Recharger Board voltage regulation requires calibration (common)
Verify monitor power and disconnect connectors
- Test point
- Power switch, P12, P8
- Expected
- Monitor off, P12 and P8 disconnected
7 more checks with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Calibration: Recharger Supply Output Voltage high voltage
Procedure to verify and adjust recharger board output voltage to specification using test load and variable DC power supply.
Ranked causes
- 1. Recharger supply requires calibration adjustment (unknown)
Monitor power switch
- Test point
- Power switch
- Expected
- Off
9 more checks with pass and fail actions, 8 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 sensor calibration failure
Sensor failure with calibration error detected
Ranked causes
- 1. CO2 sensor failure (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 sensor EEPROM failure
Sensor EEPROM failure detected, CO2 channel disabled
Ranked causes
- 1. Sensor EEPROM checksum error or failure (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 sensor heater failure
Sensor temperature control hardware failure detected
Ranked causes
- 1. Sensor heater failure or MSP board malfunction (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 sensor motor drive failure
Mainstream sensor motor drive hardware failure, channel disabled
Ranked causes
- 1. Sensor motor drive hardware failed (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 waveform absent
No CO2 waveform signal displayed
Ranked causes
- 1. Cuvette contaminated or light source faulty (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 waveform degraded
Degraded or absent CO2 waveform signal
Ranked causes
- 1. Cuvette contaminated or light source faulty (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Equipment alert not triggered on ECG lead disconnection patient safety
Monitor fails to display ECG FAULT message when a single ECG lead is disconnected
Ranked causes
- 1. ECG lead fault detection circuit not functioning (rare)
Single ECG lead disconnection alert
- Test point
- Monitor display message area and ALARM(S) OFF indicator light
- Expected
- EQUIPMENT ALERT / ECG FAULT message displayed indicating removed lead; ALARM(S) OFF light flashes; for software 3.6x+ ECG FAULT at top; for other versions ECG FAULT and RESP FAULT alternate
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Expansion Module rear panel reassembly caution
Procedure to close and secure Expansion Module after repair or component replacement
Ranked causes
- 1. Module reassembly after service (unknown)
Verify spacers present before tightening
- Test point
- Expansion Module Chassis mounting points
- Expected
- All spacers in place; five upper spacers omitted when SpO2 module present
1 more check with pass and fail actions, 4 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Expansion Module rear panel removal caution
Procedure to disassemble Expansion Module for component access and repair
Ranked causes
- 1. Routine maintenance or component replacement required (unknown)
4 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
Expansion module side panel replacement needed caution
Patient connector or speaker side panel deteriorated or damaged; requires removal and replacement
Ranked causes
- 1. Side panel physical damage or wear (rare)
2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
Functional verification after calibration or board replacement
Need to confirm proper operation of Propaq CS monitor and options after calibration or circuit board replacement. Software and hardware self-tests check programming integrity, then hardware.
Ranked causes
- 1. Calibration performed or circuit board replaced (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Fuse F1 open due to RP3 misadjustment caution
Fuse F1 on the right side panel opens as a result of incorrect RP3 adjustment during recharger supply calibration.
Ranked causes
- 1. RP3 overvoltage limit misadjusted (occasional)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Green LED charging indicator does not illuminate
The green LED on the monitor's right side panel does not light up when AC power adapter is connected and functioning properly.
Ranked causes
- 1. Fuse F1 open or defective (common)
Verify fuse F1 integrity
- Test point
- Fuse F1 on Recharger Board at dc input connector
- Expected
- Fuse intact and continuous (not open)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Monitor does not power on, battery charging indicator lights caution
Unit fails to turn on when AC power adapter connected, but BATTERY CHARGING indicator illuminates
Ranked causes
- 1. Recharger Board fuse F2 open (common)
Verify fuse F2 continuity or visual inspection for open
- Test point
- Fuse F2
- Expected
- Continuity or intact filament
- Tools
- Multimeter or visual inspection
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
MSP and SpO2 Board replacement caution
Replacement of MSP Board and SpO2 Board in main unit
Ranked causes
- 1. Failed or degraded MSP or SpO2 Board (unknown)
Disconnect speaker cable from MSP Board
- Test point
- Speaker cable connector on MSP Board
- Expected
- Cable fully disconnected
5 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
MSP/SpO2 Boards require replacement caution
Expansion Module with CO2 option needs board replacement procedure
Ranked causes
- 1. MSP/SpO2 Board failure or malfunction (unknown)
Open Expansion Module
- Test point
- Expansion Module housing
- Expected
- Module opened
6 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI
NIBP cuff hose air leak patient safety
Air system integrity compromised; non-invasive blood pressure measurements inaccurate or not obtainable
Ranked causes
- 1. O-ring gasket worn or degraded in threaded cuff hose fitting (common)
Inspect cuff hose fittings for air leaks under pressure
- Test point
- Cuff hose threaded fitting connection
- Expected
- No visible air leaks; constant pressure maintained
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
NIBP system fault
NIBP system disabled, single fault encountered
Ranked causes
- 1. NIBP system malfunction (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Printer not functioning
Printer paper not feeding or printing; mechanical jam or failure to engage with media
Ranked causes
- 1. Printer Assembly mechanical failure or jam (unknown)
2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
PROM replacement caution
PROM requires removal and installation using special tool to prevent socket damage and static discharge
Ranked causes
- 1. PROM failure or upgrade required (unknown)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
PROM replacement required caution
Software PROM needs replacement due to corruption, obsolescence, or malfunction
Ranked causes
- 1. PROM damaged by static discharge or wear (occasional)
Verify equipment is at static-protected workstation
- Test point
- Work environment
- Expected
- Static-protected work area with grounding
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
PROM suspected faulty or needs replacement caution
Need to replace PROM chips on Digital Board; procedure requires special handling to prevent damage.
Ranked causes
- 1. PROM failure or software update required (unknown)
2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
Radio card replacement required caution
Symbol Radio PCMCIA card or antenna assembly needs replacement for wireless functionality restoration
Ranked causes
- 1. Radio card malfunction or incompatibility (occasional)
Check expansion module label for radio frequency marking
- Test point
- Expansion module label
- Expected
- Presence of specific frequency symbol indicates 5 GHz requirement
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Reinstall Digital Board or Display patient safety
Reassembly procedure with specific torque specifications and cable installation order to ensure proper component seating and electrical connectivity.
Ranked causes
- 1. Reinstallation following replacement (unknown)
10 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
Replace Digital Board or Display patient safety
Digital Board contains monitor-specific configuration programming; Display is beneath Digital Board. Both require careful disassembly and reassembly procedures.
Ranked causes
- 1. Digital Board or Display replacement required (unknown)
7 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
Replace SpO2 Boards caution
Procedure to replace two SpO2 Boards in SpO2 module or Expansion Module without CO2 option
Ranked causes
- 1. SpO2 Board requires replacement (unknown)
Open SpO2 Module or Expansion Module
- Test point
- Module housing
- Expected
- Module opened per procedure
10 more checks with pass and fail actions, 9 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Replace Symbol Radio PCMCIA Card
Replacement of wireless Acuity option radio card assembly on Digital Board for Propaq CS monitor
Ranked causes
- 1. Symbol Radio PCMCIA Card failure or upgrade required (unknown)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Required test equipment for functional verification
Complete list of calibrated test equipment and patient simulators needed for Propaq CS functional verification. All equipment must meet manufacturer specifications and be traceable to national calibration standards.
Ranked causes
- 1. Equipment not calibrated to specifications (rare)
Obtain required pressure test equipment
- Test point
- Equipment inventory
- Expected
- Digital pressure meter 0-300 mmHg with squeeze bulb (Netech Digamano equivalent), cuff calibration kit PN 008-0012-XX
9 more checks with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Rubber gasket loose or displaced
Interface Chassis and Front Chassis rubber gaskets recessed around perimeter are loose, displaced, or unseated
Ranked causes
- 1. Gasket displacement during assembly/disassembly (occasional)
Inspect rubber gaskets around Front Chassis perimeter
- Test point
- Recessed gasket areas on Front Chassis perimeter
- Expected
- Gaskets properly seated in recess on all sides
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Self-test failure on power-on
Monitor displays error code or failure message during startup self-test instead of reaching Main Menu
Ranked causes
- 1. Hardware or software integrity failure detected by self-test (unknown)
Identify error code or failure message displayed
- Test point
- Monitor startup screen
- Expected
- If Main Menu displayed, all tests passed; if failure message shown, note error code
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Side panel installation improper fit caution
Side panel does not seat flush with Rear Chassis exterior or clamp does not secure properly
Ranked causes
- 1. Side panel not completely seated in Rear Chassis (common)
Inspect side panel seating before clamp installation
- Test point
- Side panel edges along entire perimeter
- Expected
- Side panel flush with exterior of Rear Chassis on all sides
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Side panel removal difficult caution
Adhesive gasket around side panel requires considerable force to separate from Rear Chassis
Ranked causes
- 1. Adhesive gasket seal between side panel and Rear Chassis (common)
Verify no components are being pried against during panel removal
- Test point
- Side panel perimeter
- Expected
- No prying force against interior components
4 more checks with pass and fail actions, 2 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
Static discharge damage to PROM caution
PROM modules damaged by electrostatic discharge during handling or installation
Ranked causes
- 1. Electrostatic discharge during PROM handling or installation (occasional)
Inspect PROM electrical function after installation
- Test point
- PROM module
- Expected
- Normal operation and software load
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Temperature calibration error
Temperature circuitry out of calibration, temperature channel disabled
Ranked causes
- 1. Temperature circuit out of calibration (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Error codes
| Code | Meaning | Trigger | Severity |
|---|---|---|---|
CALIBRATION ERROR-SERVICE REQUIRED - (SCO2) | CO2 bench calibration error detected | CO2 bench calibration failure | error |
CALIBRATION ERROR, TEMP DISABLED | Temperature circuitry out of calibration; temperature channel disabled | Monitor detects temperature sensor calibration out of range | error |
CUFF FAULT: NIBP DISABLED, SERVICE REQUIRED | Non-invasive blood pressure system fault detected | Single fault encountered in NIBP system | error |
CUFF FAULT: NIBP DISABLED, SERVICE REQUIRED | Single fault detected in NIBP system | NIBP system failure during operation | error |
CUFF FAULT: NIBP DISABLED, SERVICE REQUIRED | NIBP measurement system has single fault; channel disabled until repaired | NIBP system fault detected | error |
DEGRADED WAVEFORM, CHECK ADAPTER - (MCO2) | CO2 waveform quality degraded; may indicate contaminated adapter or faulty light source | Degraded CO2 waveform detected | warning |
DEGRADED WAVEFORM, CHECK ADAPTER - (MCO2) | CO2 waveform degraded or weak | Reduced signal quality from sensor | warning |
DEGRADED WAVEFORM-SERVICE REQUIRED - (SCO2) | Sidestream CO2 waveform degraded; possible contamination or light source failure | Degraded sidestream CO2 waveform | error |
ECG FAULT | ECG signal loss or lead disconnection detected | Single ECG lead disconnected from patient simulator or monitor input | warning |
EQUIPMENT ALERT / ECG FAULT / MULTIPLE LEAD FAIL | Multiple ECG leads disconnected or multiple ECG channel failures | Two or more ECG leads disconnected from monitor input or simulator | error |
EQUIPMENT ALERT - MULTIPLE | Multiple equipment failures or faults detected (software 3.6x and greater) | Two or more ECG leads disconnected or multiple system faults detected | error |
LACK OF WAVE, CHECK ADAPTER, SENSOR - (MCO2) | CO2 waveform absent or undetectable; adapter or sensor fault | No CO2 waveform detected | error |
LACK OF WAVEFORM-SERVICE REQUIRED - (SCO2) | Sidestream CO2 waveform absent; possible contamination or light source failure | No sidestream CO2 waveform detected | error |
MOTOR FAILURE-SERVICE REQUIRED - (SCO2) | CO2 bench motor drive failure detected | Motor drive in CO2 bench failed | error |
OCCLUSION-CHECK EXHAUST PORT/TUBING - (SCO2) | Exhaust port or tubing occlusion detected | Occlusion detected at exhaust after removing external blockage | warning |
OCCLUSION-CHECK EXHAUST PORT/TUBING - (SCO2) | Sidestream CO2 exhaust tubing or port occluded; pump defect if error persists | Sidestream CO2 exhaust occlusion detected | warning |
PROGRAM FAULT: SETTINGS LOST, TIME/DAY RESET | Drained battery causing loss of stored settings | Monitor powered on with depleted backup battery | warning |
PROGRAM FAULT: SETTINGS LOST, TIME/DAY RESET | Monitor settings and time/date have been reset to factory defaults | Monitor turned on after drained battery | warning |
PUMP FAILURE, SERVICE REQUIRED - (SCO2) | Sidestream CO2 pump failure or tubing kinked | Pneumatic pump or tubing failure | error |
RESP FAULT | Respiration signal loss or impedance measurement failure | Respiration lead disconnected or impedance measurement out of range | warning |
SENSOR FAILURE, CALIBRATION ERROR - (MCO2) | CO2 sensor calibration failure detected | Sensor calibration error | error |
SENSOR FAILURE - EEPROM - (MCO2) | CO2 mainstream sensor EEPROM checksum error; CO2 channel disabled | Sensor EEPROM checksum failure detected | error |
SENSOR FAILURE - EEPROM - (MCO2) | Sensor EEPROM failure detected (typically checksum error) | Sensor EEPROM checksum error or failure | error |
SENSOR FAILURE, HEATER - (MCO2) | CO2 sensor temperature control hardware failure detected | Sensor heater hardware failure | error |
SENSOR FAILURE, MOTOR DRIVE - (MCO2) | Mainstream CO2 sensor motor drive hardware failure; channel disabled | Sensor motor drive hardware failure | error |
Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI
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ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.