Q: 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

Q: Poor cooling, increase in interior temperature. Compressor runs continuously.

Possible cause: Ventilation around cooling unit is not sufficient, interior walls iced up, temperature set too high, ambient temperature too high, too much warm food placed at once, dirty condenser, or defective fan. Check that ventilation grille is not obstructed, defrost the refrigerator, set a lower temperature, remove ventilation grille temporarily to let warm air escape, remove warm food or let it cool down first, clean the condenser, or contact an authorized service agent for defective fan

Q: 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. Charge battery; establish connection; replace main switch; replace supply line fuse; replace battery; clean/secure connections; replace cable with proper cross section

Q: 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

Q: Drawer opens unintentionally when moving (e.g., while driving)

Possible cause: Door latch position is not set correctly. Adjust door latch position so that the opening gap is in the range of 2 mm to 5 mm

Question 1

Reduced cooling performance or shortened lifespan

Accepted Answer

Possible cause: Insufficient air flow due to improper installation spacing. Ensure minimum spacings of at least 50 mm (2 in) around the refrigerator as specified in installation guidelines.

Question 2

The refrigerator does not work

Accepted Answer

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

Question 3

Poor cooling, increase in interior temperature, compressor runs continuously

Accepted Answer

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

Question 4

Poor cooling, increase in interior temperature. Compressor runs continuously.

Accepted Answer

Possible cause: Ventilation around cooling unit is not sufficient, interior walls iced up, temperature set too high, ambient temperature too high, too much warm food placed at once, dirty condenser, or defective fan. Check that ventilation grille is not obstructed, defrost the refrigerator, set a lower temperature, remove ventilation grille temporarily to let warm air escape, remove warm food or let it cool down first, clean the condenser, or contact an authorized service agent for defective fan

Question 5

Compressor does not run (battery connection)

Accepted Answer

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. Charge battery; establish connection; replace main switch; replace supply line fuse; replace battery; clean/secure connections; replace cable with proper cross section

Question 6

Unusual noises

Accepted Answer

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

Question 7

Drawer opens unintentionally when moving (e.g., while driving)

Accepted Answer

Possible cause: Door latch position is not set correctly. Adjust door latch position so that the opening gap is in the range of 2 mm to 5 mm

Question 8

Error: Under or over voltage (1 flash)

Accepted Answer

Possible cause: Supply voltage is outside of the set range. Check power supply and battery voltage

Question 9

Error: Excessive fan current (2 flashes)

Accepted Answer

Possible cause: Fan load on the electronics unit is more than 1 A. Check fan and wiring for shorts or defects

Question 10

Error: The motor does not start (3 flashes)

Accepted Answer

Possible cause: Rotor is jammed or pressure difference in the cooling system is too high. Check compressor and cooling system pressure

Question 11

Error: Speed too low (4 flashes)

Accepted Answer

Possible cause: Cooling system is overloaded, minimum motor speed cannot be maintained. Reduce load and ensure adequate ventilation

Question 12

Error: Overheating of the electronics unit (5 flashes)

Accepted Answer

Possible cause: Cooling system loaded too heavily or temperature set too high. Improve ventilation around the cooling unit

Question 13

Error: Temperature sensor errors (Constant flashing)

Accepted Answer

Possible cause: Temperature sensor is defective. Replace temperature sensor

Question 14

Insufficient cooling performance and shortened lifespan

Accepted Answer

Possible cause: Insufficient air flow around the refrigerator installation. Ensure minimum spacings of >= 50 mm / >= 2 in to furniture are observed.

Question 15

Temperature increase in compartments / Refrigerator not cooling effectively

Accepted Answer

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.

Question 16

Refrigerator shuts down unexpectedly

Accepted Answer

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.

Question 17

Door does not lock or seal correctly

Accepted Answer

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.

Question 18

Poor cooling, increase in interior temperature, compressor does not run

Accepted Answer

Possible cause: Battery capacity exhausted, connection interruption, defective main switch, blown supply line fuse, low battery voltage, loose/corroded cables, cable cross section too small, defective compressor. Charge battery, check/reestablish electronic and supply line connections, replace main switch or fuse, replace/repair cables, ensure correct cable cross-section, or contact authorized service agent

Question 19

The drawer opens unintentionally when moving (e.g. while driving) or does not close properly

Accepted Answer

Possible cause: Door latch position is not set correctly or drawer is not fully latched. Adjust door latch position until opening gap is within 2 mm to 5 mm, and ensure drawer is securely clicked in place upon closing

Question 20

The drawer opens unintentionally when moving (e.g., while driving) or does not close properly

Accepted Answer

Possible cause: Door latch position is not set correctly or drawer is not properly latched. Adjust the door latch position so the opening gap is in the range of 2 … 5 mm, and ensure the drawer is properly latched and secured when closing until a clear click is heard

Question 21

Under or over voltage (1 flash)

Accepted Answer

Possible cause: Supply voltage is outside of the set operating range. Check supply voltage and battery charging status

Question 22

Excessive fan current (2 flashes)

Accepted Answer

Possible cause: Fan load on the electronics unit is more than 1 A. Check fan and electronics for short circuits or failure

Question 23

The motor does not start (3 flashes)

Accepted Answer

Possible cause: Rotor is jammed or pressure difference in the cooling system is too high. Check for mechanical blockages in the compressor and cooling circuit

Question 24

Speed too low (4 flashes)

Accepted Answer

Possible cause: Cooling system is overloaded, minimum motor speed cannot be maintained. Reduce load, improve ventilation around the unit

Question 25

Overheating of the electronics unit (5 flashes)

Accepted Answer

Possible cause: Cooling system loaded too heavily or ambient temperature/settings too high. Improve ventilation, clear cooling space, check ambient conditions

Question 26

Temperature sensor errors (Constant flashing)

Accepted Answer

Possible cause: Temperature sensor is defective. Contact an authorized service agent to replace sensor

Question 27

Significant increase of temperature in the compartments / Food spoiling

Accepted Answer

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.

Question 28

Door not locked correctly on the opposite side (double-sided door models)

Accepted Answer

Possible cause: Misalignment or incomplete latch engagement.. Push on that side at the top and the bottom until it locks in place.

Question 29

Poor cooling, increase in interior temperature. The compressor does not run (battery connection).

Accepted Answer

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), or cable cross-section too small. Charge the battery, establish a connection, replace main switch, replace supply line fuse, replace battery, clean corrosion and tighten loose cables, or replace cable with appropriate cross-section

Question 30

Error indicator LED flashes 1 time (Under or over voltage)

Accepted Answer

Possible cause: Supply voltage is outside of the set range. Check battery voltage and supply lines

Question 31

Error indicator LED flashes 2 times (Excessive fan current)

Accepted Answer

Possible cause: Fan load on the electronics unit is more than 1 A. Check fan and wiring for shorts or overload

Question 32

Error indicator LED flashes 3 times (The motor does not start)

Accepted Answer

Possible cause: Rotor is jammed or pressure difference in the cooling system is too high. Check if compressor/motor turns freely and check cooling system pressures

Question 33

Error indicator LED flashes 4 times (Speed too low)

Accepted Answer

Possible cause: Cooling system is overloaded, minimum speed of the motor cannot be maintained. Improve ventilation and reduce thermal load

Question 34

Error indicator LED flashes 5 times (Overheating of the electronics unit)

Accepted Answer

Possible cause: Cooling system is loaded too heavily or temperature set too high. Improve compartment ventilation and check operating environment

Question 35

Error indicator LED flashes constantly (Temperature sensor errors)

Accepted Answer

Possible cause: Temperature sensor is defective. Replace the temperature sensor

Question 36

Significant temperature increase in compartments

Accepted Answer

Possible cause: Door kept open for long periods or poor ventilation. Minimize opening time, ensure adequate air circulation and clearance around refrigerator

Question 37

Battery management system shuts down refrigerator

Accepted Answer

Possible cause: Low vehicle battery voltage protection activated. Contact vehicle manufacturer; ensure vehicle engine is running or use a battery monitor during DC operation

Question 38

Door not locked correctly on the opposite side

Accepted Answer

Possible cause: Misaligned double-sided door latch. Push on the top and bottom of that side until it locks in place; check or replace with adjustable door latch

Question 39

[Mechanical/Water] Bottom latch alignment or version mismatch

Accepted Answer

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.

Question 40

Insufficient cooling performance and shortened lifespan

Accepted Answer

Possible cause: Insufficient air flow around the refrigerator and furniture installation. Ensure minimum spacing of >= 50 mm / 2 in around the unit and proper ventilation

Question 41

Insufficient air flow resulting in shortened lifespan and reduced cooling performance

Accepted Answer

Possible cause: Inadequate spacing around refrigerator when installed in furniture. Ensure minimum spacings of >= 50 mm / >= 2 in are maintained for ventilation

Error Code / Indicator	Symptom / Meaning	Step-by-Step DIY Fix	Suggested Actions
`N/A`	Reduced cooling performance or shortened lifespan Possible Cause: Insufficient air flow due to improper installation spacing	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`	Poor cooling, increase in interior temperature. Compressor runs continuously. Possible Cause: Ventilation around cooling unit is not sufficient, interior walls iced up, temperature set too high, ambient temperature too high, too much warm food placed at once, dirty condenser, or defective fan	Check that ventilation grille is not obstructed, defrost the refrigerator, set a lower temperature, remove ventilation grille temporarily to let warm air escape, remove warm food or let it cool down first, clean the condenser, or contact an authorized service agent for defective fan	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	Charge battery; establish connection; replace main switch; replace supply line fuse; replace battery; clean/secure connections; replace cable with proper cross section	DIY Safe
`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) Possible Cause: Door latch position is not set correctly	Adjust door latch position so that the opening gap is in the range of 2 mm to 5 mm	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`	Insufficient cooling performance and shortened lifespan Possible Cause: Insufficient air flow around the refrigerator installation	Ensure minimum spacings of >= 50 mm / >= 2 in to furniture are observed.	DIY Safe
`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`	Poor cooling, increase in interior temperature, compressor does not run Possible Cause: Battery capacity exhausted, connection interruption, defective main switch, blown supply line fuse, low battery voltage, loose/corroded cables, cable cross section too small, defective compressor	Charge battery, check/reestablish electronic and supply line connections, replace main switch or fuse, replace/repair cables, ensure correct cable cross-section, or contact authorized service agent	DIY Check / Tech Fallback
`N/A`	The 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 until opening gap is within 2 mm to 5 mm, and ensure drawer is securely clicked in place upon closing	DIY Safe
`N/A`	The 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 properly latched	Adjust the door latch position so the opening gap is in the range of 2 … 5 mm, and ensure the drawer is properly latched and secured when closing until a clear click is heard	DIY Safe
`N/A`	Under or over voltage (1 flash) Possible Cause: Supply voltage is outside of the set operating range	Check supply voltage and battery charging status	DIY Safe
`N/A`	Excessive fan current (2 flashes) Possible Cause: Fan load on the electronics unit is more than 1 A	Check fan and electronics for short circuits or failure	DIY Safe
`N/A`	The motor does not start (3 flashes) Possible Cause: Rotor is jammed or pressure difference in the cooling system is too high	Check for mechanical blockages in the compressor and cooling circuit	DIY Safe
`N/A`	Speed too low (4 flashes) Possible Cause: Cooling system is overloaded, minimum motor speed cannot be maintained	Reduce load, improve ventilation around the unit	DIY Safe
`N/A`	Overheating of the electronics unit (5 flashes) Possible Cause: Cooling system loaded too heavily or ambient temperature/settings too high	Improve ventilation, clear cooling space, check ambient conditions	DIY Safe
`N/A`	Temperature sensor errors (Constant flashing) Possible Cause: Temperature sensor is defective	Contact an authorized service agent to replace sensor	Professional Intervention Required
`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`	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.	DIY Safe
`N/A`	Poor cooling, increase in interior temperature. The 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), or cable cross-section too small	Charge the battery, establish a connection, replace main switch, replace supply line fuse, replace battery, clean corrosion and tighten loose cables, or replace cable with appropriate cross-section	DIY Safe
`N/A`	Error indicator LED flashes 1 time (Under or over voltage) Possible Cause: Supply voltage is outside of the set range	Check battery voltage and supply lines	DIY Safe
`N/A`	Error indicator LED flashes 2 times (Excessive fan current) Possible Cause: Fan load on the electronics unit is more than 1 A	Check fan and wiring for shorts or overload	DIY Safe
`N/A`	Error indicator LED flashes 3 times (The motor does not start) Possible Cause: Rotor is jammed or pressure difference in the cooling system is too high	Check if compressor/motor turns freely and check cooling system pressures	DIY Safe
`N/A`	Error indicator LED flashes 4 times (Speed too low) Possible Cause: Cooling system is overloaded, minimum speed of the motor cannot be maintained	Improve ventilation and reduce thermal load	DIY Safe
`N/A`	Error indicator LED flashes 5 times (Overheating of the electronics unit) Possible Cause: Cooling system is loaded too heavily or temperature set too high	Improve compartment ventilation and check operating environment	DIY Safe
`N/A`	Error indicator LED flashes constantly (Temperature sensor errors) Possible Cause: Temperature sensor is defective	Replace the temperature sensor	Professional Intervention Required
`N/A`	Significant temperature increase in compartments Possible Cause: Door kept open for long periods or poor ventilation	Minimize opening time, ensure adequate air circulation and clearance around refrigerator	DIY Safe
`N/A`	Battery management system shuts down refrigerator Possible Cause: Low vehicle battery voltage protection activated	Contact vehicle manufacturer; ensure vehicle engine is running or use a battery monitor during DC operation	DIY Check / Tech Fallback
`N/A`	Door not locked correctly on the opposite side Possible Cause: Misaligned double-sided door latch	Push on the top and bottom of that side until it locks in place; check or replace with adjustable door latch	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
`N/A`	Insufficient cooling performance and shortened lifespan Possible Cause: Insufficient air flow around the refrigerator and furniture installation	Ensure minimum spacing of >= 50 mm / 2 in around the unit and proper ventilation	DIY Safe
`N/A`	Insufficient air flow resulting in shortened lifespan and reduced cooling performance Possible Cause: Inadequate spacing around refrigerator when installed in furniture	Ensure minimum spacings of >= 50 mm / >= 2 in are maintained for ventilation	DIY Safe

Dometic NRX

Technical Specifications

Master Troubleshooting & Diagnostics Matrix

Frequently Asked Questions

Q: What does climate class of SN (Sub Normal) mean?

Q: What’s the cooling performance in warmer ambient temperatures?

Q: How to operate an RMxxxx with a solar panel?

Q: My RMxxxx needs to be replaced. What would be an alternative?

Q: The refrigerator does not work In AC power mode?

Q: The refrigerator does not work In DC power mode?

Q: The refrigerator does not work In GAS mode?

Q: In automatic mode: The refrigerator is being operated with gas although it is connected to The AC power supply?

Q: The refrigerator is not cooling adequately?

Q: WARNING type fault messages

Q: ERROR type fault messages