Hi there. I'm having a big headache with one "Carrier Mistral 500 Plus Diesel" unit.

Here, in Bulgaria, it's hard to find good service for such units. They either rush to replace parts, without attempting to find what the problem is or mess them up completely.

The unit in question had a hard time with someone of the second variety. That someone has completely destroyed one of the IC's on the logic board (OEM #133500). I've managed to identify it as the relay driver and with the help of good professionals we were able to repair the damage as much as possible.

Now the unit works fine using the diesel engine, but won't start the 3-phase electrical motor when plugged in. The motor itself works fine when jump started.

I was hoping to get some kind of wiring diagram to help me identify the problem, before going on with purchasing a spare board (~ 400 quid) and find out that nothing changes.

Thanks in advance.