Your assistance please.

I was recently advised by an electrical contractor specialising in aircon that the reason my fujitsu AOTS12LDC inverter unit was not working was because the pcb needed replacing - quotes on the way! I've just looked again at the job sheet and realised the engineer/technician is looking at replacing both the controller pcb and the inverter pcb.

My initial question is, is it usual for both to be replaced in this manner. During the visit he took the top off the indoor bedroom unit (and had a quick look in) and went outside too look at the outdoor unit (did nothing more outdoors than write serial numbers down).

?