Anesthesia machines · Narkomed family

Dräger Narkomed MRI: troubleshooting and error codes

The ServiceForge knowledge base holds 27 documented symptoms for the Dräger Narkomed MRI, with 60 ranked causes, 50 diagnostic checks with test points and expected values, and 5 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; patient ventilation compromised; critical system failure.

Ranked causes

1. Incorrect ventilator settings (common)
2. Inadequate O2 or pipeline supply pressure (common)
3. Breathing hose or scavenger hose disconnected (common)
4. No 8V power to ventilator controller feedthru filters (occasional)
5. Wire harness or cable defects (occasional)
6. Remote solenoid defective (occasional)
7. Ventilator controller cable or tubing connection failure (occasional)
8. Valve and guide assembly defective (rare)

First check

Verify ventilator switch and settings

Test point: Ventilator control panel
Expected: Ventilator switch ON; inspiratory flow, frequency, I:E ratio, tidal volume, pressure limit correct

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

VPO monitor respiratory volume monitor loss patient safety

Respiratory volume monitoring not functioning; unable to detect and display patient tidal volume.

Ranked causes

1. Flow sensor hose connections loose or disconnected (common)
2. Flow sensor not installed correctly (common)
3. Flow sensor elements or O-rings defective (occasional)
4. No power to flow sensor electronics module (occasional)
5. Flow sensor assembly defective (occasional)
6. NAD monitor assembly defective (occasional)

First check

Verify flow sensor installation and connections

Test point: Flow sensor in breathing circuit
Expected: Sensor installed correctly with hoses connected and gaskets seated

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

Core-M monitor inoperative patient safety

Monitor display off or functions not responding; affects patient monitoring capability.

Ranked causes

1. No power to battery box PCB (common)
2. Power cord not connected (common)
3. Internal cable failure to power connector (occasional)
4. Sensor interface connections or elements faulty (occasional)
5. Battery box PCB assembly defective (occasional)

First check

Verify power cord is connected

Test point: Power cord inlet
Expected: Cord fully inserted and secured

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

No O2 supply pressure alarm patient safety

O2 pressure alarm not functioning; critical safety feature disabled.

Ranked causes

1. O2 pressure switch faulty (common)
2. Cable from battery box to alarm channel defective (common)
3. Supply voltage to alarm channel missing (occasional)
4. Alarm channel assembly defective (occasional)
5. Battery box PCB assembly defective (occasional)

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

Calibration: Cylinder Pressure Regulator high voltage

Adjustment of oxygen, N2O, CO2, air, helium and helium/oxygen cylinder pressure regulators to ensure correct output pressure across the cylinder working range.

Ranked causes

1. Regulator output pressure requires calibration or verification (common)
2. Machine disassembly required to access regulators (common)
3. Test gauge connection and adjustment (common)
4. Post-adjustment verification and reassembly (common)

First check

Disconnect pipeline hoses and set up system for adjustment

Test point: System Power switch
Expected: ON after initial setup, then STANDBY before regulator access

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

VPO monitor serial port communication failure

Serial port not communicating with peripheral or host; data transmission failure.

Ranked causes

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

First check

Check serial port configuration

Test point: Peripheral and host devices
Expected: Serial port settings configured correctly and matching

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

No O2 supply pressure alarm functional patient safety

O2 pressure alarm system not responding; critical safety alarm disabled.

Ranked causes

1. O2 pressure switch not detecting supply pressure (common)
2. Alarm channel cable or connection failure (common)
3. Alarm channel supply voltage absent or low (occasional)

VPO monitor breathing pressure monitor loss patient safety

Breathing pressure monitoring not functioning; unable to detect and display patient respiratory pressure.

Ranked causes

1. Pilot line disconnected or blocked (common)
2. Pressure monitor requires recalibration (occasional)
3. NAD monitor assembly defective (occasional)

First check

Verify pilot line connection

Test point: Pilot line at monitor and system
Expected: Pilot line connected at both ends and patent

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

VPO monitor no audio alarms, display blank, keypad inoperative patient safety

VPO monitor display blank; no audio alarms; keypad not responding; monitoring capability lost.

Ranked causes

1. Audio alarms fail (common)
2. Power supply voltage incorrect or power supply defective (common)
3. NAD monitor assembly defective (occasional)

First check

Check power cables to monitor

Test point: Monitor power inlet and data connections
Expected: Cables connected and secure

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

Breathing Pressure Monitor not reading correctly patient safety

Pressure readings are inaccurate or unstable

Ranked causes

1. Zero calibration out of adjustment (common)
2. Span calibration out of adjustment (common)

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

Calibration: Halothane vaporizer soil condition inspection patient safety

Inspect halothane Dräger vapor 19 or 19.1 vaporizers for soil condition per serial number marking

Ranked causes

1. Halothane vaporizer soil condition 1 detected (rare)

First check

Check serial number plate for plus (+) mark

Test point: Rear of halothane vaporizer serial number plate
Expected: Plus (+) mark preceding serial number means inspection not required; absence means inspection required

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

Calibration: Vapor concentration verification patient safety

Verify that Dräger vapor vaporizers output correct anesthetic agent concentrations at specified levels (1%, 2.5%, 4%)

Ranked causes

1. Vaporizer concentration drift or calibration error (common)

First check

Verify vaporizer output concentration at 1% setting

Test point: Vaporizer outlet
Expected: 1% ±tolerance per SP00073

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

Calibration: Vaporizer labeling verification patient safety

Verify all vapor 19 and 19.1 vaporizers have required safety and operating labels attached

Ranked causes

1. Missing or incorrect vaporizer safety labels (occasional)

First check

Verify concentration output label present and readable

Test point: Vaporizer rear below mount
Expected: Label P/N S010015 with concentration verification statement present

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

Calibration: Ventilator relief valve diaphragm replacement

Replace ventilator relief valve diaphragm as part of periodic maintenance certification

Ranked causes

1. Scheduled maintenance requirement (common)

First check

Replace ventilator relief valve diaphragm

Test point: Ventilator relief valve
Expected: Diaphragm replaced per SP00075

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

Conditionally functional status displayed at power-up caution

Minor problem detected; system displays CONDITIONALLY FUNCTIONAL and requires key press to proceed

Ranked causes

1. Minor hardware or software anomaly (occasional)

First check

Observe diagnostic message at power-up

Test point: Display screen
Expected: CONDITIONALLY FUNCTIONAL message displayed

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

N2O regulator adjustment high voltage

Specific procedure for adjusting N2O cylinder pressure regulator; N2O cylinder valve and O2 cylinder valve must both be opened, N2O flow control valve fully opened, and O2 flow controlled until N2O reaches 4 L/min.

Ranked causes

1. N2O regulator output pressure outside specification (common)

First check

Open N2O and O2 cylinder valves and set flow to reach 4 L/min N2O

Test point: N2O cylinder valve, O2 cylinder valve, flow control valves, flow indicator
Expected: N2O flow control valve fully open, O2 valve open, N2O flow at 4 L/min

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

No display present at system power-up patient safety

Narkomed MRI powered on but VPO monitor display remains blank or unresponsive; no diagnostics or status screens appear.

Ranked causes

1. Display module power or communication failure (unknown)

First check

Verify display power and connections

Test point: Display module power connector and data cable
Expected: Power connector seated; data cable connected; display responds to power-on

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

O2 and other gas regulator adjustment with pressure compensation high voltage

Adjustment of O2, air, helium, He/O2 and N2 regulator output pressure with compensation for cylinder pressure variation. Output pressure decreases 0.5 psi for every 100 psi cylinder pressure increase above 1000 psi. Regulators calibrated at 47 psi with 1000 psi cylinder supply.

Ranked causes

1. Regulator output pressure varies with cylinder pressure; compensation required (common)

First check

Measure cylinder pressure and determine regulator output setting from compensation table

Test point: Cylinder pressure gauge; compensated output table
Expected: Output setting per table for measured cylinder pressure; tolerance -4, +2 psi

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

O2 sensor disconnection detection patient safety

Verification of O2 sensor disconnection message display on VPO monitor

Ranked causes

1. Oxygen sensor cable disconnected (common)

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

Oxygen supply alarm does not activate within correct range patient safety

O2 SUPPLY alarm activates outside the acceptable 34–40 psi setpoint window during normal pressure decay

Ranked causes

1. Oxygen supply pressure alarm switch setpoint out of adjustment (common)

First check

Monitor O2 SUPPLY alarm activation point during pressure decay from full system pressure

Test point: O2 test gauge (TEE fitting in ¼ in. O2 regulator output line)
Expected: Alarm activates between 40 and 34 psi, 40 to 34 psi
Tools: O2 test gauge

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

Power-up diagnostic shows CONDITIONALLY FUNCTIONAL status caution

VPO monitor diagnostic system detects minor problem at power-up; CONDITIONALLY FUNCTIONAL message displays; operator must press key to proceed.

Ranked causes

1. Minor system problem detected during power-up diagnostics (occasional)

First check

Observe power-up diagnostic result message

Test point: VPO monitor display at startup
Expected: CONDITIONALLY FUNCTIONAL message displayed

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

Power-up diagnostic shows FUNCTIONAL status

VPO monitor diagnostic system completes at power-up with FUNCTIONAL message; all tests pass; machine ready for operation.

Ranked causes

1. All system functions normal; power-up diagnostics passed (common)

First check

Observe power-up diagnostic result message

Test point: VPO monitor display at startup
Expected: FUNCTIONAL message displayed

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

Power-up diagnostic shows NON-FUNCTIONAL status patient safety

VPO monitor diagnostic system detects serious problem at power-up; NON-FUNCTIONAL message displays; machine does not proceed to normal screens.

Ranked causes

1. Serious system problem detected during power-up diagnostics (rare)

First check

Observe power-up diagnostic result message

Test point: VPO monitor display at startup
Expected: NON-FUNCTIONAL message displayed with no progression to MACHINE MONITOR screen

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

Power-up diagnostic test fails or shows non-functional status

System fails power-up self-tests and does not proceed to normal operation screens

Ranked causes

1. Firmware or RAM failure (unknown)

First check

Observe power-up diagnostics screen after brief System Startup display

Test point: VPO monitor display
Expected: One of three messages: FUNCTIONAL, CONDITIONALLY FUNCTIONAL, or NON-FUNCTIONAL

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

Preventive maintenance due indicator on display

Power-up diagnostic display shows PREVENTIVE MAINTENANCE DUE message; current date exceeds stored maintenance due date.

Ranked causes

1. Periodic maintenance due date reached or exceeded (common)

First check

Note displayed maintenance due date on startup screen

Test point: VPO monitor power-up display
Expected: PREVENTIVE MAINTENANCE DUE message visible with date information

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

VPO Monitor configuration verification

Operator verifies time and date settings in monitor configuration menu

Ranked causes

1. Initial system configuration after power-up (common)

First check

Press CONFIG key

Test point: VPO Monitor keypad
Expected: CONFIGURE screen displayed

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

VPO Monitor self-diagnostics and startup verification

VPO Monitor initializes; displays diagnostic test results and system version information

Ranked causes

1. Normal system power-up and self-test execution (common)

First check

Connect gas supply to VPO Monitor

Test point: Pipeline supply or cylinder connections
Expected: Gas supply connected and flowing

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

Error codes

Code	Meaning	Trigger	Severity
`CONDITIONALLY FUNCTIONAL (power-up diagnostic result)`	Minor problem detected; system will operate but requires operator acknowledgment; specific issue requires investigation.	Automatic on system power-up; generated when VPO monitor detects non-critical fault.	warning
`FUNCTIONAL (power-up diagnostic result)`	All power-up diagnostic tests passed; system fully operational and ready for clinical use.	Automatic on system power-up; generated when VPO monitor diagnostics complete successfully.	info
`NON-FUNCTIONAL (power-up diagnostic result)`	Serious problem detected; system will not proceed to normal operation screens; machine must not be used.	Automatic on system power-up; generated when VPO monitor detects critical fault preventing operation.	critical
`PREVENTIVE MAINTENANCE DUE (power-up message)`	Periodic maintenance due date stored in system has been reached or exceeded; preventive service is required.	Automatic on system power-up; triggered when current date equals or exceeds stored maintenance due date.	warning
`SOIL 1`	Halothane vaporizer soil condition 1 detected	Halothane Dräger Vapor 19 or 19.1 vaporizer fails soil inspection per SP00073	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.