Dräger Capno: troubleshooting and error codes
The ServiceForge knowledge base holds 9 documented symptoms for the Dräger Capno, with 13 ranked causes, 10 diagnostic checks with test points and expected values, and 9 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI
Symptoms
CO2 sensor not detecting patient safety
CO2 sensor unplugged or not positioned correctly on cuvette. Device displays CO2-Sensor? alarm indicating sensor communication failure.
Ranked causes
- 1. Sensor physically disconnected (common)
- 2. Sensor not positioned on cuvette (occasional)
- 3. Sensor defective (occasional)
3 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 cuvette window soiled patient safety
Cuvette window is soiled or CO2 sensor window is dirty, preventing accurate measurement. Device displays Clean CO2 cuvette alarm.
Ranked causes
- 1. Cuvette lens contaminated (common)
- 2. Sensor window contaminated (common)
2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 measurement fault patient safety
CO2 sensor or measurement circuit has detected a fault. Device displays CO2 measurement faulty alarm with high priority. Readings cannot be trusted.
Ranked causes
- 1. CO2 sensor defective (common)
- 2. Measurement circuit malfunction (rare)
2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
Calibration: CO2 sensor
Routine calibration procedure for CO2 sensor before measurement. Apparatus may prompt calibration if curve does not return to zero after expiration or when specifically demanded.
Ranked causes
- 1. Routine calibration required before CO2 measurement (common)
Install CO2 cuvette into Y-piece patient socket
- Test point
- Patient socket of Y-piece
- Expected
- Cuvette windows face sideways
7 more checks with pass and fail actions, 5 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 calibration failed
Apparatus displays 'CO2 calibration not ok' message instead of success message after calibration cycle.
Ranked causes
- 1. Calibration procedure error or sensor fault (unknown)
Observe calibration failure message
- Test point
- Display
- Expected
- 'CO2 calibration not ok' message
1 more check with pass and fail actions, 1 corrective action, and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 calibration out of tolerance patient safety
Zero point calibration of CO2 sensor has drifted out of tolerance. Device displays CO2 calibration? alarm with top priority.
Ranked causes
- 1. Calibration drift (common)
2 corrective actions and part numbers are in ServiceForge. Connect ServiceForge to your AI
CO2 monitoring disabled patient safety
CO2 monitoring feature has been deactivated. Low priority advisory alarm indicates monitoring is off and patient may not be receiving CO2 data.
Ranked causes
- 1. Monitoring was turned off by operator (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
End-tidal CO2 concentration too high patient safety
Measured end-tidal CO2 concentration has exceeded upper alarm limit. High priority alarm indicates patient hypercarbia or ventilation problem.
Ranked causes
- 1. Ventilation inadequate or patient hypercarbia (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
End-tidal CO2 concentration too low patient safety
Measured end-tidal CO2 concentration has fallen below lower alarm limit. High priority alarm indicates patient hypocapnia or inadequate ventilation.
Ranked causes
- 1. Ventilation excessive or patient hypocapnia (common)
1 corrective action and part numbers are in ServiceForge. Connect ServiceForge to your AI
Error codes
| Code | Meaning | Trigger | Severity |
|---|---|---|---|
Clean CO2 cuvette | Cuvette or sensor window contamination preventing measurement | Optical lens soiled with debris or condensation | critical |
CO2 calibration? | Zero point calibration drift out of tolerance | Calibration lost or drifted; unsuccessful calibration attempt | critical |
CO2 calibration interrupted | CO2 sensor calibration process halted before completion | Error or interruption during test gas calibration procedure | error |
CO2 calibration not ok | CO2 sensor calibration procedure completed but calibration unsuccessful | Measured values outside acceptable tolerance during test gas calibration | error |
CO2 measurement faulty | CO2 sensor or measurement electronics malfunction | Sensor circuit or sensor element failure; measurement data unreliable | critical |
CO2 monitoring off | CO2 monitoring feature has been deactivated by operator | Operator disabled monitoring feature | warning |
CO2-Sensor? | CO2 sensor communication or connection failure | Sensor unplugged, not positioned on cuvette, or defective | critical |
etCO2 too high | End-tidal CO2 concentration exceeds upper alarm threshold | Measured CO2 above alarm limit | critical |
etCO2 too low | End-tidal CO2 concentration below lower alarm threshold | Measured CO2 below alarm limit | critical |
Likely causes and actions for each code are in ServiceForge. Connect ServiceForge to your AI
Community
0 fixes logged by technicians through their AI, with outcomes, for this model.
ServiceForge knowledge base record. Field-unverified unless technicians confirmed it. A teaching summary of the record, not a service manual. Export 2026-10-14.