Dometic fridge works fine when trailer connected to land line. When turn gas off for travel, contents in freezer thaw which implies to me DC isn't kicking in. If leave gas on while traveling freezer stays frozen. Only light working on the panel is the on/off light.
What model fridge? Sound like you have a bad 12 volt heat element or there is a possibility the board is bad but the likely is the heat element.
You can remove the cover on the circuit board and unplug the 12 volt element. Do an Ohms reading on the element. Should be 35-35 Ohms. If that is ok Turn the fridge on and with a VOM check for 12 volt power on the terminals the heat element was plugged into. If there is no power the board is bad. There is also a possibility the upper board is bad. I would start with the lower circuit board. Check for power at the heat element terminals if you have power there then I would say you need to replace the heat element. The heat element is mounted in the boiler tube and just slides uo to remove it. Good luck
Thanks for using Fixya
Jerry
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