Dometic NRX
Official technical documentation and workshop diagnostics for NRX.
Technical Specifications
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|
N/A | Reduced or insufficient cooling performance and shortened lifespan Possible Cause: Insufficient air flow due to improper installation spacing around the refrigerator or furniture | Ensure minimum spacings of at least 50 mm (2 in) around the refrigerator as specified in installation guidelines. | DIY Safe |
N/A | The refrigerator does not work Possible Cause: The fuse in the DC cable is defective or vehicle fuse has blown; vehicle battery is discharged; ignition is not switched on; temperature at the compressor is too low (< 0 °C) | Replace fuse; replace vehicle fuse; test and charge battery; switch on ignition; close/cover all external ventilation grilles completely with insulation material | DIY Safe |
N/A | Poor cooling, increase in interior temperature, compressor runs continuously Possible Cause: Ventilation around cooling unit is not sufficient; interior walls are iced up; temperature set too high; ambient temperature too high; too much food / warm food placed at once; condenser dirty; fan defective | Check ventilation grille obstruction; defrost refrigerator; set lower temperature; remove ventilation grille temporarily; remove excessive/warm food; clean condenser; contact authorized service agent | DIY Check / Tech Fallback |
N/A | Compressor does not run (battery connection) Possible Cause: Battery capacity exhausted; interruption in battery electronics connection; main switch defective; supply line fuse blown; battery voltage too low; loose cables, poor contact (corrosion); cable cross section too small; defective compressor | Charge battery; establish connection; replace main switch; replace supply line fuse; replace battery; clean/secure connections; replace cable with proper cross section; contact authorized service agent if compressor is defective | DIY Check / Tech Fallback |
N/A | Unusual noises Possible Cause: Component of refrigerant circuit cannot move freely and touches the wall; foreign object stuck between cooling unit and wall; fan noise | Bend component carefully away from obstruction; remove foreign object; contact authorized service agent | DIY Check / Tech Fallback |
N/A | Drawer opens unintentionally when moving (e.g., while driving) or does not close properly Possible Cause: Door latch position is not set correctly or drawer is not fully latched | Adjust door latch position so that the opening gap is in the range of 2 mm to 5 mm, and ensure the drawer is securely clicked into place upon closing | DIY Safe |
N/A | Error: Under or over voltage (1 flash) Possible Cause: Supply voltage is outside of the set range | Check power supply and battery voltage | DIY Safe |
N/A | Error: Excessive fan current (2 flashes) Possible Cause: Fan load on the electronics unit is more than 1 A | Check fan and wiring for shorts or defects | DIY Safe |
N/A | Error: The motor does not start (3 flashes) Possible Cause: Rotor is jammed or pressure difference in the cooling system is too high | Check compressor and cooling system pressure | DIY Safe |
N/A | Error: Speed too low (4 flashes) Possible Cause: Cooling system is overloaded, minimum motor speed cannot be maintained | Reduce load and ensure adequate ventilation | DIY Safe |
N/A | Error: Overheating of the electronics unit (5 flashes) Possible Cause: Cooling system loaded too heavily or temperature set too high | Improve ventilation around the cooling unit | DIY Safe |
N/A | Error: Temperature sensor errors (Constant flashing) Possible Cause: Temperature sensor is defective | Replace temperature sensor | Professional Intervention Required |
N/A | Temperature increase in compartments / Refrigerator not cooling effectively Possible Cause: Door left open for long periods, poor ventilation/heat dissipation, incorrect temperature setting, or obstructed airflow | Minimize door opening time, ensure sufficient distance from walls/objects for air circulation, keep ventilation openings clear, and adjust temperature setting according to food load. | DIY Safe |
N/A | Refrigerator shuts down unexpectedly Possible Cause: Vehicle battery management system shutting down refrigerator to protect the battery, or insufficient DC supply voltage | Verify vehicle battery voltage, ensure engine is running when using DC power or use a battery monitor, and consult vehicle manufacturer regarding battery management settings. | DIY Check / Tech Fallback |
N/A | Door does not lock or seal correctly Possible Cause: Door latch misaligned or not fully engaged on the opposite side | Check and install adjustable door latch if necessary. Push on the top and bottom of the door until it clicks/locks securely in place. | DIY Safe |
N/A | Door not locked correctly on the opposite side (double-sided door models) Possible Cause: Misalignment or incomplete latch engagement | Push on that side at the top and the bottom until it locks in place; check or replace with adjustable door latch. | DIY Safe |
N/A | Significant increase of temperature in the compartments / food spoiling Possible Cause: Door opened for long periods, door not properly locked/sealed, or refrigerator left empty for too long | Keep temperature fluctuation low, open the freezer only as often and as long as necessary, ensure doors are pushed until a clear click is heard at top and bottom, or switch off and defrost if left empty. | DIY Safe |
N/A | [Mechanical/Water] Bottom latch alignment or version mismatch Possible Cause: Mismatch between old version and new version components (Serial numbers 51400309-51400311 vs 51400312-51400314) | Verify serial numbers and follow compulsory vs optional component installation rules for the specific version. | DIY Safe |
Frequently Asked Questions
Q: What does climate class of SN (Sub Normal) mean?
The climate class SN (Sub Normal) defines the intended ambient temperature range for the absorption fridge's optimal operation.
Q: What’s the cooling performance in warmer ambient temperatures?
Cooling performance for absorption fridges is affected by warmer ambient temperatures. Ensure proper ventilation around the unit as detailed in the manual to maintain performance.
Q: How to operate an RMxxxx with a solar panel?
To operate an RMxxxx series absorption fridge with a solar panel, ensure the solar system provides adequate 12V DC power or sufficient battery storage to handle the power requirements, particularly when running on DC mode.
Q: My RMxxxx needs to be replaced. What would be an alternative?
When replacing an RMxxxx series refrigerator, look for current Dometic absorption or compressor models matching the physical dimensions and energy source requirements of your motorhome cutout.
Q: The refrigerator does not work In AC power mode?
Check if the vehicle is properly connected to the AC mains supply, verify that the AC fuse in the motorhome is intact, and ensure the refrigerator is switched on to AC mode on the control panel.
Q: The refrigerator does not work In DC power mode?
DC mode (12V) typically only works while the vehicle engine is running and the alternator is supplying power, preventing the vehicle starter battery from draining. Check the 12V DC fuses, vehicle ignition connection, and input voltage at the refrigerator terminals.
Q: The refrigerator does not work In GAS mode?
Ensure the gas cylinder valve is open, the main gas shut-off valves in the motorhome are open, and there is no air trapped in the gas line (try igniting another gas appliance first). Check if the igniter is sparking and that the burner is clean.
Q: In automatic mode: The refrigerator is being operated with gas although it is connected to The AC power supply?
In automatic energy selection mode, if the AC voltage is outside the acceptable tolerance range or unstable, the control system automatically switches to gas mode as a safety fallback. Check the AC supply voltage and connections.
Q: The refrigerator is not cooling adequately?
Verify that ventilation grilles are not blocked, check that the thermostat is set correctly, ensure the door seals tightly, do not overpack the interior restricting airflow, and verify that the selected energy source (AC, DC, or Gas) is actively functioning.
Q: WARNING type fault messages
WARNING type fault messages indicate a non-critical operational issue or prompt. Consult the user manual for the specific warning code displayed on the 10-series control panel to take corrective action.
Q: ERROR type fault messages
ERROR type fault messages indicate a critical system failure that stops the refrigerator from functioning safely on the current energy source. Check the specific error code on the display, troubleshoot the underlying power, gas, or ventilation issue, or contact customer service.