Hi, I'm not an expert, but I have a couple of guesses as to what might be going on: I assume that the fridge is running off a DC circuit, with the alternator of your van putting out 12V, and the refrigerator powered from that? Is the fridge working correctly when you connect it directly to the battery (no inverter or other stuff in between)? Is the DC output that the
fridge is getting from the van battery the same as the AC output from the mains? If it's not, then the fridge might not be able to properly control its internal temperature, and the cooling elements will turn on and off randomly until something fails. The voltage difference could be caused by a bad connection, or by a low-voltage cutout on the inverter. The first thing to do would be to check that the fridge is not getting any power from the 12V circuit at all. Check the battery connection, and also try to connect it to the battery directly, without going through the inverter. If it's not getting any power at all, either it's not getting connected to the DC circuit, or it's not working right. If it's the former, the wiring is probably bad. If it's the latter, then you may need a new fridge (on warranty).