Hitachi RAS20-FSN (VRF) Advice/Manual needed

[james10]

I have just picked up a site with the above units on and one of them is giving an error 51 message, i have never worked on these units before so any help or advice would be greatly appreciated.
Thanks in advance
James

[joe-ice]

book says its an abnormality of current sensor for the inverter compressor.not reading current when compressor should be running or faulty pcb 2 board

[james10]

Thanks Joe Turned out to be the Compressor PCB

[fordjarini]

51 = Abnormality of inverter current sensor. Failure of sensor or inverter PCB
Alarm codes : http://www.hitachiaircon.com/argws/html/helpingyou/en/AlarmCodes.pdf

HITACHI : http://www.hitachiaircon.com