How to Reset Dometic Furnace Codes

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Dometic furnaces are electronically controlled and have diagnostic codes for identifying problems. If a Dometic furnace has a problem, it will usually set a code, alerting you to the problem. If your Dometic furnace has failed or is not running as it should, you can reset its codes to factory defaults to identify the problem and correct it. Resetting Dometic furnace codes does not affect any other functions, such as temperature control or humidification. Resetting the codes on a Dometic gas or electric furnace requires turning off power to the unit and unplugging it if possible. You must also be able to access the digital control panel without difficulty. The reset process is different for gas and electric furnaces and some models may require different steps than what is described below.

Resetting Dometic Gas Furnace Codes

Dometic gas furnaces with a rotary encoder reset their diagnostic codes by cycling the power to the furnace off and then on for 15 seconds. Dometic gas furnaces with an electronic controller reset their diagnostic codes by cycling the power to the furnace off and then on for 30 seconds.

Resetting Dometic Electric Furnace Codes

Dometic electric furnaces reset their diagnostic codes by cycling the power to the furnace off and then on for 30 seconds.

Rotary Encoder Code Reset

Rotary encoder codes are reset by holding the up arrow button and the down arrow button simultaneously for five seconds.

Electronic Controller Code Reset

Electronic controller codes are reset by holding the up arrow button and down arrow button simultaneously for 10 seconds.

Confirming the Diagnostic Codes

After resetting the codes, the furnace will indicate which code has been reset and the operation will be prompted on the digital control panel. Write down the diagnostic code that is displayed and make a note of which code has been cleared.

Conclusion

In some cases, a reset diagnostic code may not identify the exact problem with your furnace. In other cases, the code may accurately identify the malfunction but not provide a solution. In either of these cases, you should contact a qualified technician to identify and repair the problem. If your furnace has failed or is not running as it should, you can reset its codes to factory defaults to identify the problem and correct it. Resetting Dometic furnace codes does not affect any other functions, such as temperature control or humidification. In some cases, a reset diagnostic code may not identify the exact problem with your furnace. In other cases, the code may accurately identify the malfunction but not provide a solution. In either of these cases, you should contact a qualified technician to identify and repair the problem.