Anesthesia machines · Narkomed family

Dräger Narkomed M: troubleshooting and error codes

The ServiceForge knowledge base holds 34 documented symptoms for the Dräger Narkomed M, with 70 ranked causes, 139 diagnostic checks with test points and expected values, and 0 error codes. Each symptom below shows its causes and the first check; the rest is one connection away. Connect ServiceForge to your AI

Symptoms

Ventilator inoperative patient safety

Ventilator is not functioning or not working properly during operation

Ranked causes

1. Incorrect ventilator settings (common)
2. Valve and guide assembly failure (occasional)
3. Inadequate gas supply pressure (occasional)
4. Incorrect breathing hose or scavenger connections (occasional)
5. No 8V power at ventilator controller J2 (occasional)
6. Wire harness or connector failure (occasional)
7. Ventilator controller assembly failure (rare)

First check

Verify ventilator switch and all settings are correct

Test point: Ventilator switch, flow, frequency, I:E ratio, tidal volume, pressure limit
Expected: Switch ON; all parameters set to prescribed values

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

Display Blank Upon System Power-up patient safety

Display does not show any information or image when system is powered on

Ranked causes

1. Display cable not connected to display port (common)
2. Internal cable to J204 on processor disconnected or damaged (occasional)
3. Display assembly defective (occasional)
4. Power supply voltages out of tolerance (occasional)
5. Processor assembly failure (rare)

First check

Verify display cable connected to display port

Test point: Display port connector
Expected: Display cable properly connected

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

Keypad Inoperative patient safety

Keypad keys do not respond to presses; user cannot input commands via keypad

Ranked causes

1. Display cable not connected to display port (common)
2. Internal cable to J4 on processor disconnected or damaged (occasional)
3. Display and keypad assembly defective (occasional)
4. Power supply voltages out of tolerance (occasional)
5. Processor assembly failure (rare)

First check

Verify display cable connected to display port

Test point: Display port connector
Expected: Display cable properly connected

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

Loss of Respiratory Volume Monitor patient safety

Respiratory volume monitor not working or displaying properly

Ranked causes

1. Sensor cord disconnected from interface panel (common)
2. Sensor installed improperly (common)
3. Sensor valve mounting or gaskets degraded (occasional)
4. Internal cable from interface panel to processor board disconnected (occasional)
5. Processor assembly board failure (rare)

First check

Is respiratory volume monitor working properly

Test point: Respiratory volume monitor display
Expected: Monitor displays respiratory volume readings

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

Serial port communication failure

Peripheral device cannot communicate with anesthesia machine via serial interface port

Ranked causes

1. Peripheral cable not connected to serial interface port (common)
2. Peripheral or host serial port configuration mismatch (occasional)
3. Defective peripheral cable (occasional)
4. Internal cable from serial port to processor damaged (occasional)
6. Processor assembly still defective after replacement (rare)

First check

Verify peripheral cable is physically connected

Test point: Serial interface port
Expected: Cable connected

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

Loss of Breathing Pressure Monitor patient safety

Breathing pressure monitor not reading or not displaying pressure on Narkomed M

Ranked causes

1. Pressure hose connections loose or disconnected (common)
2. Pilot line not connected (common)
3. Internal tubing from interface panel to transducer disconnected or damaged (occasional)
4. Processor assembly failure (rare)

First check

Check all pressure hose connections

Test point: Absorber, O2 sensor adapter, interface panel hose ports
Expected: All hoses seated and secure

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

Loss of O2 Monitor patient safety

Oxygen monitor not reading or displaying oxygen level on Narkomed M anesthesia machine

Ranked causes

1. Sensor cord not connected to interface panel (common)
2. Sensor element not installed correctly (common)
3. Internal cable from interface panel to J103 damaged or disconnected (occasional)
4. Processor assembly failure (rare)

First check

Verify sensor cord connected to interface panel

Test point: Interface panel sensor port
Expected: Sensor cord properly seated

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

INSP O2 LOW alarm condition patient safety

Central alarm display shows low inspired oxygen concentration message with audible alarm

Ranked causes

1. Oxygen analyzer sensor not calibrated or out of range (common)
2. Oxygen supply interruption or low pressure (occasional)
3. Oxygen sensor blockage or malfunction (rare)

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

No Audio Alarms patient safety

System does not produce audio alarm sounds

Ranked causes

1. Speaker wire harness loose or connector not seated (common)
2. Speaker defective (occasional)
3. Processor assembly failure (rare)

First check

Check speaker wire harness and J12 connection

Test point: J12 connector on processor board
Expected: Wire harness securely connected to J12

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

No O2 Supply Pressure Alarms patient safety

Oxygen supply low pressure alarms not functioning or sounding

Ranked causes

1. Speaker wire harness loose or connection to J12 not seated (common)
2. O2 low pressure alarm switch malfunction or wire harness loose (common)
3. Processor assembly failure (rare)

First check

Verify O2 supply pressure alarms functional

Test point: Low O2 supply pressure alarm
Expected: Alarms sound when O2 low

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

No oxygen supply pressure alarms patient safety

Low oxygen pressure alarm fails to sound when supply pressure is low

Ranked causes

1. Speaker circuit or speaker defective preventing alarm output (common)
2. Processor power supply voltage insufficient for alarm function (occasional)

First check

Test speaker alarm output function

Test point: Speaker output
Expected: Audible alarm sound when O2 pressure alarm triggered

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

PMC failure after sensor troubleshooting patient safety

Unit does not pass performance and maintenance check

Ranked causes

1. Original processor assembly requires reinstallation (occasional)
2. Original volume sensor requires reinstallation (occasional)

First check

Perform complete PMC on the unit

Test point: All performance and maintenance check points
Expected: Unit passes all PMC criteria

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

Absorber system maintenance required

Routine inspection and maintenance of CO2 absorber system including valve components, sensors, and soda lime canister.

Ranked causes

1. Scheduled maintenance procedure (common)

First check

Examine O-rings on sensor housing, oxygen sensor plug, and breathing pressure hose assemblies

Test point: O2 Sensor Housing, Oxygen Sensor Plug, Breathing Pressure Hose Assembly
Expected: O-rings intact and undamaged

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

Battery voltage out of specification

Battery voltage during AC operation or battery mode outside specified range

Ranked causes

1. Battery not fully charged or charge circuit defective (common)

First check

Measure battery voltage during AC operation at full charge

Test point: Battery terminals
Expected: 13.50 to 14.80 VDC, +/-0.65 VDC
Tools: Digital voltmeter

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

Breathing Pressure Monitor zero not reading correctly

After disconnection and stabilization, breathing pressure monitor zero point is inaccurate

Ranked causes

1. Zero calibration point requires reset (common)

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

Calibration: Cylinder Pressure Regulator high voltage

Adjust oxygen cylinder pressure regulator output to correct compensated setting based on cylinder pressure; verify tolerance after adjustment and test oxygen supply alarm function.

Ranked causes

1. Regulator output pressure requires adjustment or verification (common)

First check

Disconnect all pipeline hoses

Test point: System
Expected: Hoses disconnected

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

Calibration: Oxygen monitor patient safety

One-year service interval oxygen monitor calibration procedure for the Narkomed M anesthesia machine

Ranked causes

1. Scheduled one-year oxygen monitor calibration (common)

First check

Access Oxygen Monitor Service Screen

Test point: Mon Cal key
Expected: Oxygen Monitor Service Screen appears

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

Calibration: Oxygen Monitor zero calibration

Zero calibration procedure for O2 cells A and B displayed on service screen with current and stored values

Ranked causes

1. O2 cells require zero calibration (common)

First check

Access Oxygen Monitor Service Screen

Test point: Service Screen menu
Expected: Oxygen Monitor Service Screen displayed

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

Calibration: Oxygen Ratio Controller (ORC) adjustment patient safety

Adjust ORC to maintain proper oxygen concentration across flow range using calibrated oxygen monitor

Ranked causes

1. ORC requires calibration adjustment (unknown)

First check

Set O2 flow

Test point: O2 flow control
Expected: 8 l/min
Tools: O2 flowmeter

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

Calibration: PMC Procedure verification patient safety

Perform PMC Procedure as part of ORC calibration completion

Ranked causes

1. PMC Procedure required after ORC adjustment (unknown)

Compensated Regulator Output Setting Verification caution

Verification that the regulator output pressure matches the compensated setting based on actual cylinder pressure, using a lookup table for pressures from 1000 to 2000 psi.

Ranked causes

1. Output pressure varies with cylinder supply pressure (common)

First check

Determine current cylinder pressure

Test point: Cylinder pressure indicator
Expected: 1000, 1200, 1400, 1600, 1800, or 2000 psi

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

Narkomed M battery voltage low during battery operation caution

Battery voltage drops below cutoff threshold during battery-powered operation

Ranked causes

1. Battery depleted or aging (common)

First check

Measure battery voltage during battery-powered operation

Test point: Battery terminals during battery mode
Expected: Cutoff voltage 10.5 to 10.0 VDC, 10.0 to 10.5 VDC

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

Narkomed M battery voltage out of range during AC operation caution

Battery voltage measured at terminals during AC line operation falls outside specified range

Ranked causes

1. Charging circuit malfunction (unknown)

First check

Measure battery voltage during AC line operation

Test point: Battery terminals
Expected: 13.50 to 14.80 VDC at full charge, +0.0 to +1.3 VDC

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

O2 sensor will not calibrate

Oxygen sensor fails to calibrate properly despite following calibration procedure steps.

Ranked causes

1. Sensor not stabilizing or improper sensor condition (unknown)

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

ORC adjusting screw out of spec patient safety

Oxygen concentration does not fall within specification when adjusting oxygen and nitrous oxide flows

Ranked causes

1. ORC adjusting screw requires repositioning (common)

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

Oxygen sensor replacement patient safety

Oxygen sensor capsule requires replacement; sensor is located in pressure sensor adapter on top of inspiratory valve.

Ranked causes

1. Sensor capsule degradation or failure (unknown)

First check

Turn system power to STANDBY

Test point: System Power switch
Expected: STANDBY position

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

Primary power supply output voltage out of range high voltage

Voltage measurement at Condor power supply J3 connector (+15VDC) does not fall within acceptable limits; all downstream voltages may be affected.

Ranked causes

1. Condor power supply failure or fault (unknown)

First check

Measure +15VDC at Condor power supply J3

Test point: J3-1 (Brn)
Expected: 14.0 to 16.0 VDC, 14.0 to 16.0 VDC

Processor board power supply voltages out of range high voltage

Voltage measurements at J14 connector (±5V, ±12V rails) do not fall within acceptable limits; display or monitoring functions may be impaired or non-functional.

Ranked causes

1. Primary power supply fault or voltage regulation failure (unknown)

First check

Measure +5VDC at processor board J14

Test point: J14-12,14 (Red, Orn)
Expected: 4.80 to 5.25 VDC, 4.80 to 5.25 VDC

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

Replace Spiromed respiratory volume sensor caution

Sensor installed between lower absorber pipe and PEEP valve; requires disconnection from monitor, removal from pipe, and reinstallation with proper gasket seating.

Ranked causes

1. Spiromed sensor requires replacement (unknown)

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

Spiromed Sensor lubrication caution

Lubrication of Spiromed Sensor lateral holes using specified lubrication kit during maintenance.

Ranked causes

1. Scheduled Spiromed Sensor lubrication (common)

First check

Locate four lateral holes on Spiromed Sensor

Test point: Spiromed Sensor lateral holes marked by arrows
Expected: Four holes visible and accessible

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

Vaporizer internal leak or exclusion system test failure patient safety

Vaporizer fails internal leak test or exclusion system test during vapor concentration verification

Ranked causes

1. Internal leak in vaporizer system (occasional)

First check

Vaporizer internal leak or exclusion system test

Test point: Vaporizer system integrity
Expected: PASS - no internal leaks detected

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

Ventilator controller assembly failure confirmation patient safety

Ventilator still inoperative after all prior checks

Ranked causes

1. Ventilator controller assembly defective (rare)

First check

Check all cables and tubing connections at ventilator controller

Test point: Ventilator controller
Expected: All connections secure and properly routed

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

Ventilator controller power supply voltage out of range high voltage

Voltage measurement at J2 connector (+8VDC rail) does not fall within acceptable limits; ventilator functions may be impaired or non-functional.

Ranked causes

1. Primary power supply fault or voltage regulation failure (unknown)

First check

Measure +8VDC at ventilator controller J2

Test point: J2-3 (Brn)
Expected: 7.70 to 8.30 VDC, 7.70 to 8.30 VDC

Verify processor board power supply voltages high voltage

Technician must measure DC voltages at processor board connector J14 to verify proper power distribution.

Ranked causes

1. Power supply output voltage out of tolerance (occasional)

First check

Measure +5VDC at processor board

Test point: J14 pins 12, 14 (Red, Orange wires)
Expected: 4.80 to 5.25 VDC, 4.80 to 5.25 VDC
Tools: DMM

4 more checks with pass and fail actions, 1 corrective action, and part numbers 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.