Im having issues with a 16 seer Amana 2 stage HP. On start up theres a humming or grinding noise from the scroll, then it fades away. System was installed by customers patio, big mistake. So apparently it makes same noise when shut down, ive only heard it on start up. Upon looking at it i found crankcase heater not energizing when system is off. No power coming from board. I was hoping the grinding noise was liquid in the compressor, doesnt explain noise when shuts down though. Ordered new board, units 6 months old, same frickin problem the control board/CCH isnt sending anything out, amana apparently has no answer for it. Will call back in am to find out what the deal is with boards.
I stopped by another customers house has a Amana 14 seer single stage, no txv, no control board on this 14 seer, just a good old fashion contactor same frickin noise on start up of compressor. Units not by patio or a window so no issue, but afraid to swap the 16 seer out only to replace it with another pump with same problem. Any help guys?