there is a mains heater somewhere that is used to make the fridge work.you will need to remove the fridge to find it.once you find it you will need to check the resistance of the mains heater and if there is a resistance then check for mains at heater terminals.there will be a 12v heater as well so make sure you test the correct one (will be marked up with the voltage on the heaters).i would try to find where the mains is attached to your motorhome before getting to involved.
ck
May 2008