I have recently installed a fdc125vn with 2 srk60 wall mounts controlled by 1 hard wired controller. I had an issue with communication on first starting up but found that a problem with the cable to be the cause. Replaced faulty cable and my young assistant (bosses son) wired it up 1 to 3 and blew too pieces. I have replaced the outdoor and both indoor pc boards as per Mitsubishis help line instruction. Lights on outdoor pc board now normal, no light on inverter board, switch on and we have 2 red light flash green flash constant on outdoor. Disconnected slave indoor unit and fault goes away but outdoor unit does not run.
Mitsubishi says disconnect indoor fans but both of these run and indoor unit performs as normal, vanes move etc. Have put in separate control wire to faulty indoor unit but still no joy. Any help gladly accepted.