I've got one ofthose annoying niggles I can't get to the bottom of. One of my MCB's will trip out for no apparent reason, normally during the night. The circuit it is on is the power, fridge and fire one but even if I turn these off, it will still trip. It will do it during the day too but it will do it when connecting the hook up lead and also when disconnecting it. I am thinking it's maybe the fridge element shorting or the fire one shorting. I've checked all the sockets and all the wires are secure but do not know how to check the fridge or fire elements. Any other ideas or tips before I pay out for an electrician to do a full check. I've got a 2005 Coachman Amara 530/4 if that helps!