Anesthesia machines · Narkomed family

Dräger Narkomed Mobile: troubleshooting and error codes

The ServiceForge knowledge base holds 16 documented symptoms for the Dräger Narkomed Mobile, with 49 ranked causes, 62 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 system not functioning; no breath delivery or control unresponsive.

Ranked causes

1. Ventilator settings incorrect or not verified (common)
2. Cylinder or pipeline oxygen supply inadequate pressure (common)
3. Breathing or scavenger hose connections incorrect (occasional)
4. Ventilator controller power supply failure (occasional)
5. Ventilator controller wire harness or connections faulty (occasional)
6. Valve and guide assembly failure (occasional)
7. Ventilator controller assembly failure (occasional)

First check

Perform complete PMS on unit

Test point: Unit self-test
Expected: Unit passes all PMS tests

4 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

Display does not show any information or graphics 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. Power supply voltages out of tolerance (occasional)
4. Display assembly failure (occasional)
5. Processor assembly failure (occasional)

First check

Perform complete PMS on unit

Test point: Unit self-test
Expected: Unit passes all PMS tests

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

Keypad Inoperative

Keypad buttons not responding to user input; system cannot accept command inputs.

Ranked causes

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

First check

Perform complete PMS on unit

Test point: Unit self-test
Expected: Unit passes all PMS tests

2 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 displaying; volume readings unavailable.

Ranked causes

1. Volume sensor not installed correctly (common)
2. Sensor cord disconnected from interface panel (common)
3. Internal cable from interface panel to J102 faulty (occasional)
4. Volume sensor failure (occasional)
5. Processor assembly failure (occasional)

First check

Perform complete PMS on unit

Test point: Unit self-test
Expected: Unit passes all PMS tests

2 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

Serial port not communicating with external devices or host system.

Ranked causes

1. Peripheral cable not connected to serial interface port (common)
2. Internal cable from serial port to processor faulty (occasional)
3. Peripheral or host serial port configuration incorrect (occasional)
4. Serial cable defective (occasional)
5. Processor assembly failure (occasional)

First check

Perform complete PMS on unit

Test point: Unit self-test
Expected: Unit passes all PMS tests

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

Loss of Breathing Pressure Monitor patient safety

Breathing pressure monitor not displaying; readings unavailable; unit may operate otherwise.

Ranked causes

1. Pilot line disconnected from pressure monitoring system (common)
2. Pressure hose connections loose or disconnected (common)
3. Internal tubing from interface panel to transducer faulty (occasional)
4. Processor assembly failure (occasional)

First check

Perform complete PMS on unit

Test point: Unit self-test
Expected: Unit passes all PMS tests

2 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

O2 monitor not displaying or responding; unit may be operational otherwise.

Ranked causes

1. Sensor element not installed correctly (common)
2. Sensor cord disconnected from interface panel (common)
3. Internal cable from interface panel to J103 on processor board is faulty (occasional)
4. Processor assembly failure (occasional)

First check

Perform complete PMS on unit

Test point: Unit self-test
Expected: Unit passes all PMS tests

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

No Audio Alarms patient safety

Audio alarm function not working; no sound output when alarms are triggered.

Ranked causes

1. Speaker wire harness disconnected or damaged (common)
2. Speaker failure (common)
3. Processor assembly failure (occasional)

First check

Perform complete PMS on unit

Test point: Unit self-test
Expected: Unit passes all PMS tests

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 pressure alarm function not operational; low O2 pressure not detected.

Ranked causes

1. O2 low pressure alarm switch or wire harness faulty (common)
2. Speaker or speaker wire harness failure (common)
3. Processor assembly failure (occasional)

First check

Perform complete PMS on unit

Test point: Unit self-test
Expected: Unit passes all PMS tests

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

Scavenger system pressure out of specification patient safety

Manometer reading exceeds safe limits during negative or positive pressure tests, indicating improper scavenger function or blockage.

Ranked causes

1. Scavenger needle valve not properly adjusted (common)
2. Scavenger system blockage or obstruction (occasional)

First check

Negative pressure test - verify scavenger system vacuum

Test point: Scavenger adapter hose barb
Expected: pressure less than or equal to 0.5 cm H2O, ≤0.5 cm H2O
Tools: Manometer

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

Battery voltage out of specification

Battery voltage at full charge not within 13.50 to 14.80 VDC range during AC line operation, or low battery cutoff not within 10.5 to 10.0 VDC during battery operation.

Ranked causes

1. Battery voltage out of specification (unknown)

First check

Measure battery voltage at terminals while on AC power

Test point: Battery terminals
Expected: 13.50 to 14.80 VDC, 13.50 to 14.80 VDC
Tools: Voltmeter, multimeter

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

Calibration: Cylinder pressure regulator output caution

Adjust O2, N2O, Air, He, He/O2, or N2 regulator output pressure to specification using compensated settings based on cylinder supply pressure

Ranked causes

1. Regulator output requires calibration per cylinder pressure (common)

First check

Set System Power switch position

Test point: System Power switch
Expected: STANDBY

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

Calibration: Pressure Monitor span

Current airway pressure reading requires span calibration at known test pressure

Ranked causes

1. Pressure sensor span calibration drift (unknown)

First check

Disconnect pressure sample line from absorber

Test point: Pressure sample line connection
Expected: Line removed and absorber isolated

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

Calibration: Pressure Monitor zero

Current airway pressure reading requires zero calibration reset to atmospheric baseline

Ranked causes

1. Pressure sensor zero offset drift (unknown)

First check

Disconnect pressure sample line from absorber

Test point: Pressure sample line connection
Expected: Line removed and absorber isolated

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

O2 SUPPLY alarm set point out of range patient safety

Alarm activates outside the specified 40 to 34 psi range during system depressurization.

Ranked causes

1. Adjustment set screw out of calibration (common)

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

Oxygen sensor replacement patient safety

Oxygen sensor housing and capsule replacement procedure for Narkomed Mobile anesthesia machine. Sensor located in pressure sensor adapter on inspiratory valve dome.

Ranked causes

1. Oxygen sensor capsule degradation or failure (unknown)

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.