Dometic refrigerator · 2 model lines
Dometic refrigerator: 3 + 7 flashing + 20 s beep
Dometic documentation for 2 model lines lists “3 + 7 flashing + 20 s beep” as “The burner or cooling unit is defective”.
Check your model first. The same code can mean different things on different models. Find the model number on the appliance's data label, then use the matching row below.
What this message means by model
| Model line | What the manufacturer says | Source |
|---|---|---|
| Dometic RM8xxx / RMS8xxx / RML8xxx / RMSL8xxx | The RM8/RMS8/RML8/RMSL8 operating manual lists 3 + 7 flashing + 20 s beep as: The burner or cooling unit is defective. | Dometic RM8xxx, RMS8xxx, RML8xxx, RMSL8xxx Absorber Refrigerator Operating Manual |
| Dometic RMD8xx1 / RMD8xx5 | The RMD8 numbered-button operating manual lists 3 + 7 flashing + 20 s beep as: the burner or cooling unit is defective. | Dometic RMD8555 Absorber Refrigerator Operating Manual |
What you can safely check
- Turn the refrigerator off if cooling is unsafe or any odor or leakage is present.
- Record the display and avoid repeated resets.
Stop and call a technician for
- Burner, burner nozzles, cooling unit, and refrigerator controls are service-only.
Do not open gas, electrical, or cooling-system components; use only documented front-panel actions and call qualified RV service for repeated faults.
Write this down before you call
- 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
Other codes on Dometic RM8 / RMS8 / RML8 refrigerators
Full table: Dometic RM8 / RMS8 / RML8 refrigerators
- 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+ sig…
- 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 + 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 interna…
- external-to-internal power switching failure External-to-internal power switching failure as: Automatic switching from external to int…
- Ground contact, gas valve Ground contact at the gas valve and says to replace the internal batteries that power the…
- 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 be…
- Undervoltage detection (internal batteries) Undervoltage detection in the internal batteries means the batteries that power the elect…
- Gas operation despite mains supply voltage The refrigerator switches to gas operation when mains supply voltage is too low and will …
- Flame not ignited in GAS/Automatic mode Flame not ignited in GAS or automatic mode can be reset from the front controls and tried…
- 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…
- 230V not available or voltage too low 230V is not available or voltage is too low; below about 195V the refrigerator stops work…
- 12V not available or voltage too low 12V is not available or voltage is too low and points owners to the 12V connection, on-bo…
- 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 …
- DC power not connected DC power is not connected and points owners to the 12V connection, on-board battery, and …
- Flame not ignited in internal power mode Flame not ignited in internal power mode can be reset from the front controls and tried a…
- 230V heating element defective A 230V heating element defective fault can only be repaired by an authorized service prov…
- 12V heating element defective A 12V heating element defective fault can only be repaired by an authorized service provi…
- Flashing + acoustic signal 20 s A flashing display with a 20-second acoustic signal can only be repaired by an authorized…
- Interior lighting is switched on The interior-lighting fault can be caused by the refrigerator door not being completely c…
Other codes on Dometic RMD8 refrigerators
Full table: Dometic RMD8 refrigerators
- AC plug + temperature bars flashing + 20 s beep The AC heater element or cooling unit is defective
- DC battery + temperature bars flashing + 20 s beep The DC heater element or cooling unit is defective
- gas flame + temperature bars flashing + 20 s beep The burner or cooling unit is defective
- temperature bars flashing The temperature sensor has no contact or is defective
- AC plug + warning triangle flashing + 20 s beep AC power supply is not available or insufficient
- DC battery + warning triangle flashing + 20 s beep DC power supply is not available or insufficient
- gas flame + warning triangle flashing + 20 s beep The burner flame is not ignited during gas or automatic operation
- 15 s beep every two minutes The interior light is switched on / The interior lighting is switched on
- battery mode low-voltage 15 s beep In battery operation, a signal every 15 seconds indicates low voltage detection in the in…
- external-to-internal power switching failure External-to-internal power switching failure as: automatic change-over from external to i…
- 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+ sig…
- 3 + 8 flashing + 20 s beep GAS or automatic mode did not ignite the flame
- 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 + 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