The fridge has a mind of its own
QWe have a Waeco Coolmatic 12v fridge and when it reaches the right temperature, the compressor turns off, but not completely in one go. It starts to shut down, then cycles up and down with each cycle getting shorter. It’s only seconds during each cycle until it turns off completely, it also appears to be noisy. Do you have any ideas?
ATONY REPLIES… Normally problems with the 12V compressor fridges are shown by a fault code. This may be in the form of beeps or a flashing light. One code (3 beeps/flashes) means low voltage at the fridge but as you do not mention beeps or flashes, the fault is within the fridge.
Normally the thermostat has a largish difference between turn off and turn on temperature so it should never oscillate on and off as yours seems to do. I suspect this may well be a problem thermostat that needs replacing.
Noise from compressor fridges can be caused by part of them resting against a bulkhead or some such but, once you rule that out, I think it could be lack of gas or motor/compressor bearing failure.