Fridge works great on Gas and 240, but seems to not work on 12v anymore. 

Any usual suspects, things to check ect?

First check with your multimeter that there is voltage at the fridge.

Yes, plenty of 12 volt power at rear of fridge.

Jacks
More than likely the relay is not working at the rear of the fridge . There should be 12v on the power board all the time from the on board caravan battery to allow operation . Then their should be 12v power from your vehicle when plugged in to the caravan.  When you turn the switch to 12v  the relay turns on to allow the power from the vehicle to the fridge element at the rear of the fridge .Depending which model there may be a 12v d+ wire that turns the relay on when the vehicle is started . these circuits all need to be checked for operation . Refer to 12v circuit diagram in your manual for your fridge model .

A faulty relay is more than likely the common problem .
-- Edited by Triggy on Tuesday 28th of October 2025 11:09:59 PM

I replaced the relay and the 12 volt system on the fridge is like new again.

Thanks.