Model - RXYMQ48PVJU

I found this unit with a grounded compressor and burned PCB. Replaced both and initiated a testrun followed by a shutdown on code E5. I checked the stopvalves, incoming power, and all connections including compressor wiring for correct orientation. I also checked to make sure the refrigerant was equalized.

Here's what happens:

I have an amp meter clamped on one of the lines. The unit will initiate compressor start and will drive to about 5 amps go up to about 18 amps, ramp back down to about 5 amps, and back up again. This all happens within 5-10 seconds. Unit will initiate a slight delay and start the process over again. Every time the compressor attempts to start, it will visibly shudder.


I don't have an inverter checker, however I used Mode 2 28 to test the phase balance. All measured about 9 V.A.C. (It seems kinda low but Daikin says okay).

I really can't believe a new compressor would be DOA, but I suppose it's possible.

Any ideas or other things to check?