Great Post Richard!
Just this weekend I had a call from a client that was perplexed after having a local Key West Florida
refrigeration tech come aboard and tell him he needed a new compressor on his refrigeration system. The tech saw the flashing 3-LED error code and announced that, “well that code means the compressor is failing to start. That means it is dead and needs to be replaced.” The price
to install a new compressor was quoted at $1000 ($500 for the compressor and then $500 for labor) but fortunately the client called me to ask a few questions and 30 minutes later we had his unit up and running. Turns out the day before he had installed a new alternator
and in the process had loosened up the DC ships ground. Bingo…that was all it took to cause a voltage drop on start-up large enough for the controller to kick out and give the 3-LED error flash. What amazed the client is that he was watching both his ships DC voltage display and a hand held volt meter and he said he never saw the voltage drop during start-up. But as Richard has often said before, unless you have “superman eyes”, you can’t see what the controller sees!