Wonder if anyone can help, as daikin tech cant seem to help!

Was working on a RCY100L7W1 outdoor unit, three phase. Went to site to re-comission system but once power was turned back on nothing happend. PCB had gone down. Changed PCB but still nothing. Tested current on wiring center and that was fine, all 3 phases there. Problem was with the transformer. So iv now changed that. switched it on and the LED on the PCB was constantly flashing, indicating a faulty PCB according to the wiring diagram. Daikin can not suggest anything it may be and im stumped.

Still have all three phases on the supply and at least now power is getting to the PCB. have nothing on 123E terminal. Only suggestion iv had is the indoor PCB but i cant see it being that as im not getting power leaving the unit.

Any suggestions would be greatly appreciated!