Mini Split Help

[brogsie]

I have a Daikin mini split with one head. We had a power outage and the compressor would not run after. I replace all the PCB's inside and outside and still not working. I am getting a U4 communication error code, then a U2 power error code after resetting. I ran a temp data wire (no help). I've checked the power to the compressor and the head both good. I have tried resetting with power on and off many times. Any one have any ideas what the problem could be? Thanks for any help.