Dometic · 28 codes

Dometic RM8 / RMS8 / RML8 refrigerator fault codes

Every fault code, display message, and status light listed in Dometic's manuals and support pages for Dometic RM8xxx / RMS8xxx / RML8xxx / RMSL8xxx. Select a code for what it means, what you can safely check, and when to call a technician.

Confirm your model

Codes are model-specific. Match the model number on the appliance data label to one of these before using the table:

RM8xxx, RMS8xxx, RML8xxx, RMSL8xxx, RM8501, RM8505, RMS8501, RMS8505, RML8555, RMSL8505

Where to look and what to record

Interior data label model, product number, serial number
Front display code or lamp state photo
Power module/display board part number if service requests it
Door position and parking-mode photo if service requests it
Battery type and replacement date
Front display code or alarm pattern photo
Selected energy mode and campsite power status
Internal battery and LP supply status from normal owner controls

Code table

Code	What the manufacturer says
2 + 8 flashing + 20 s beep	230 V mode is not available or the voltage is too low
4 + 8 flashing + 20 s beep	12 V mode is not available or the voltage is too low; AES models also call out the D+ signal
3 + 8 flashing + 20 s beep	GAS or automatic mode did not ignite the flame
15 s beep every two minutes	The interior lighting is switched on
2 + 7 flashing + 20 s beep	The 230 V heating element is defective
4 + 7 flashing + 20 s beep	The 12 V heating element is defective
7 flashing	The temperature sensor has no contact or is defective
3 + 7 flashing + 20 s beep	The burner or cooling unit is defective
3 + 8 flashing brightly	During internal-battery operation, the flame was not ignited
3 + 7 flashing brightly	During internal-battery operation, the burner or cooling unit is defective
internal battery 15 s beep	An acoustic signal at 15-second intervals indicates undervoltage detection in the internal batteries
external-to-internal power switching failure	External-to-internal power switching failure as: Automatic switching from external to internal power supply does not function, so the refrigerator does not function and gas operation is not possible although batteries are inserted.
Ground contact, gas valve	Ground contact at the gas valve and says to replace the internal batteries that power the electronics.
Tank stop mode: gas operation blocked 15 minutes	Tank stop mode blocks gas operation for 15 minutes.
Recurring beep	A recurring beep can be caused by the refrigerator door not being completely closed or being left in parking mode.
Undervoltage detection (internal batteries)	Undervoltage detection in the internal batteries means the batteries that power the electronics should be replaced.
Gas operation despite mains supply voltage	The refrigerator switches to gas operation when mains supply voltage is too low and will automatically switch back to 230V operation when voltage is sufficient again.
Flame not ignited in GAS/Automatic mode	Flame not ignited in GAS or automatic mode can be reset from the front controls and tried again.
AC power not connected or AC voltage < 190 V	AC power may not be connected or AC voltage is below the operating threshold; below about 195V the refrigerator stops working on 230V.
230V not available or voltage too low	230V is not available or voltage is too low; below about 195V the refrigerator stops working on 230V.
12V not available or voltage too low	12V is not available or voltage is too low and points owners to the 12V connection, on-board battery, and fuse.
Refrigerator does not function; gas operation not possible although batteries are inserted	The on-board power supply was interrupted while gas operation was starting; no automatic switching is performed during ignition.
DC power not connected	DC power is not connected and points owners to the 12V connection, on-board battery, and fuse.
Flame not ignited in internal power mode	Flame not ignited in internal power mode can be reset from the front controls and tried again.
230V heating element defective	A 230V heating element defective fault can only be repaired by an authorized service provider.
12V heating element defective	A 12V heating element defective fault can only be repaired by an authorized service provider.
Flashing + acoustic signal 20 s	A flashing display with a 20-second acoustic signal can only be repaired by an authorized service provider.
Interior lighting is switched on	The interior-lighting fault can be caused by the refrigerator door not being completely closed or being left in parking mode.

Do not open gas, electrical, or cooling-system components; use only documented front-panel actions and call qualified RV service for repeated faults.

Do not service LP hardware, burners, electrical circuits, wiring, or refrigerator controls; use only documented front-panel reset and call qualified service for repeated ignition faults.

Do not service LP hardware, electrical circuits, wiring, or refrigerator controls; use only normal front-panel operation and call qualified service for repeated faults.

Troubleshooting guides

Official manuals and support pages