Originally Posted by caaek
have a dc fridge the unit turns on fan runs about ever 3min fan stops and unit beeps does not get cold
Without knowing more details like brand of unit, error light indication or not, etc it's a guessing game
. But the the No 1 and 2 problems are voltage issues getting to your unit. To rule
this out before you go down any further rabbit holes run a temporary power cable directly from your ships battery
to the refrigeratin unit.
I know...I know...I know...you checked it with a volt meter and you are seeing 12.3v, so it can't be your wiring
. I hear that all the time, but the electronic control module is more sensitive than your volt meter and could be cutting the unit off to protect it. So before you waste time/money on other fixes, rule
out that you have good power getting to the unit by running the temp wire and seeing what happens.
Report back with these results and more unit details and we can help you with the next trouble shooting step.