Anesthesia machines · Narkomed family

Dräger Narkomed GS: troubleshooting and error codes

The ServiceForge knowledge base holds 20 documented symptoms for the Dräger Narkomed GS, with 49 ranked causes, 69 diagnostic checks with test points and expected values, and 4 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 not functioning; bellows not moving or controls not responsive

Ranked causes

1. Ventilator settings incorrect or switched off (common)
2. Inadequate cylinder or pipeline gas supply pressure (common)
3. Breathing hose or scavenger hose connection loose or disconnected (common)
4. Ventilator controller power absent or cable disconnected (occasional)
5. Ventilator controller wire harness or cable connections damaged (occasional)
6. Valve and guide assembly failure (occasional)

First check

Verify ventilator working properly

Test point: Ventilator operation
Expected: Bellows moving, ventilator operational

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

Display blank upon system power-up caution

Display shows no image or text after power-on; screen remains dark

Ranked causes

1. Display cable not connected to processor port J204 (common)
2. Display assembly failure (occasional)
3. Power supply voltages out of tolerance (occasional)
4. Processor assembly failure (occasional)

First check

Verify display blank upon power-up

Test point: Display screen
Expected: Display shows content after power-on

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

Keypad inoperative caution

Keypad buttons not responding to presses; no input accepted from keypad

Ranked causes

1. Keypad cable not connected to processor port J4 (common)
2. Keypad assembly failure (occasional)
3. Power supply voltages out of tolerance (occasional)
4. Processor assembly failure (occasional)

First check

Verify keypad working properly

Test point: Keypad buttons
Expected: Buttons respond to presses

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

O2 monitoring not functioning; unit displays no O2 readings

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 disconnected or damaged (occasional)
4. Processor assembly failure (occasional)

First check

Verify O2 monitor working properly

Test point: O2 display
Expected: O2 readings visible

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

Loss of respiratory volume monitor patient safety

Respiratory volume monitoring not functioning; no volume readings displayed

Ranked causes

1. Sensor cord not connected to interface panel (common)
2. Volume sensor not installed correctly or sensor valve/gaskets damaged (common)
3. Internal cable from interface to J102 disconnected or damaged (occasional)
4. Processor assembly failure (occasional)

First check

Verify respiratory volume monitor working properly

Test point: Volume display
Expected: Volume readings visible

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

No oxygen supply pressure alarms patient safety

Oxygen supply pressure alarms not functioning; alarm channel inoperative

Ranked causes

1. O2 low pressure alarm switch or wire harness connection loose or damaged (common)
2. Cable or connections between J1 and J105 loose or damaged (occasional)
3. Alarm channel assembly failure (occasional)
4. Processor assembly failure (occasional)

First check

Verify O2 supply pressure alarms functional

Test point: Alarm output
Expected: Alarms sound when pressure low

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

Serial port communication failure

Serial communication with peripheral or host device not functioning

Ranked causes

1. Peripheral cable not connected to serial interface port (common)
2. Peripheral or host serial port configuration settings incorrect (common)
3. Serial cable defective (occasional)
4. NAD monitor failure (occasional)

First check

Check peripheral and host serial port configuration settings

Test point: Serial port settings
Expected: Settings match between peripheral and host

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

Loss of breathing pressure monitor patient safety

Breathing pressure monitoring not functioning; no pressure readings displayed

Ranked causes

1. Pilot line disconnected at interface or transducer (common)
2. Internal tubing from interface to transducer blocked or disconnected (occasional)
3. Processor assembly failure (occasional)

First check

Verify breathing pressure monitor working properly

Test point: Pressure display
Expected: Pressure readings visible

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

No audio alarms patient safety

Alarm sounds not functioning; no acoustic output from speaker

Ranked causes

1. Speaker wire harness disconnected or damaged at J12 (common)
2. Speaker failure (occasional)
3. Processor assembly failure (occasional)

First check

Verify audio alarms working

Test point: Speaker output
Expected: Alarm sounds heard

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

Battery voltage measurement caution

Check battery voltage at terminals during AC line operation and battery operation

Ranked causes

1. Battery not fully charged or defective (common)
2. Low battery cutoff voltage out of range (occasional)

First check

Measure battery voltage at terminals while AC powered

Test point: Battery terminals
Expected: 13.50 to 14.80 VDC at full charge, -0.65 to +0.65 VDC

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

Diagnostics power-up test failure patient safety

System does not pass initial diagnostics; display shows CONDITIONALLY FUNCTIONAL or NON-FUNCTIONAL

Ranked causes

1. Minor problem detected (CONDITIONALLY FUNCTIONAL) (occasional)
2. Serious problem detected (NON-FUNCTIONAL) (rare)

First check

Power on system

Test point: Display after power-up
Expected: FUNCTIONAL message; all tests show PASS

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

Calibration: Center vaporizer plunger clearance patient safety

Verify and adjust clearance between center vaporizer plunger block and horizontal shaft pins

Ranked causes

1. Center vaporizer plunger clearance out of specification (unknown)

First check

Measure clearance between center plunger block and horizontal shaft pins

Test point: Plunger block to small pins on horizontal shafts
Expected: approximately 0.066 in

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

Calibration: Periodic Manufacturer's Certification (PMC) for Narkomed GS patient safety

Complete PMC inspection procedure including ventilator relief valve diaphragm replacement, vaporizer soil condition testing, vapor concentration verification, and certification level determination based on equipment condition and failure codes.

Ranked causes

1. Routine PMC maintenance and certification requirement (common)

First check

Verify machine model and obtain correct PM Certification form

Test point: Equipment nameplate
Expected: Narkomed GS designation

12 more checks with pass and fail actions, 9 corrective actions, and part numbers are in ServiceForge. Connect ServiceForge to your AI

Calibration: Vaporizer Interlock Adjustment patient safety

Adjustment of interlock mechanism to ensure only one vaporizer operates at a time and proper clearance between plunger block and shaft pins

Ranked causes

1. Vaporizer interlock mechanism requires periodic adjustment (unknown)

First check

Turn System Power switch to STANDBY

Test point: System Power switch
Expected: STANDBY position

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

No display on power-up patient safety

System does not show diagnostics screen or machine monitor after power-on

Ranked causes

1. Display module failure or disconnection (occasional)

First check

Verify display connection

Test point: Display connector and power
Expected: Display powered and connected

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

Oxygen sensor calibration fails

O2 sensor will not calibrate properly after following standard calibration procedure

Ranked causes

1. Sensor calibration procedure not completed correctly (common)

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

Oxygen supply pressure alarm does not activate in correct range patient safety

O2 SUPPLY alarm activates outside the specified 40 to 34 psi pressure range during pressure drop test.

Ranked causes

1. Alarm switch setpoint out of adjustment (common)

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

Power cable disconnected from J14

Unit will not power on or operate; power cable not connected to processor board

Ranked causes

1. Power cable disconnected from J14 connector (common)

First check

Verify power cable connected to J14

Test point: J14 on processor board
Expected: Power cable fully seated at J14

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

Preventive maintenance due caution

System indicates scheduled service maintenance is overdue

Ranked causes

1. Scheduled maintenance period exceeded (common)

First check

Check system clock and maintenance schedule

Test point: System date and maintenance due date
Expected: Current date before next scheduled maintenance date

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

Recalibration of CO2 regulator flowmeter adjustment

Procedure to re-adjust the CO2 regulator if flowmeter reading deviates from 550 ml/min specification

Ranked causes

1. CO2 flowmeter out of calibration (unknown)

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

Error codes

Code	Meaning	Trigger	Severity
`CONDITIONALLY FUNCTIONAL`	System detected a minor problem but remains operable with restrictions	One or more non-critical diagnostic tests show issues during power-up	warning
`FUNCTIONAL`	All diagnostics passed; system fully operational and ready for patient use	Completion of power-up self-tests with all tests passing	info
`NON-FUNCTIONAL`	Critical system failure detected; machine cannot operate	One or more critical diagnostic tests fail during power-up; system safety or core function compromised	critical
`PREVENTIVE MAINTENANCE DUE`	Scheduled periodic maintenance has not been performed within required interval	Current system date exceeds the periodic manufacturer's service due date stored in device memory	warning

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.