Model : LGC180H4BH2Y
Serial : 5605A05156
The customer called and a/c was not working, also no air coming out of the vents. I went there and found the error code 11. It is "24 VAC power loss at TB34-1 on A55 (M1) board. P113 pin 1."
I checked voltage but there was 24 vac on pin 1. And I did unit test. Out door and blower fans were working fine but when I did cooling and heating test, nothing happened. No fans, no blower, no compressors kicking in.
I tried to jumpered compressor contactors on the board and all working good. I think the A55 board issues but I just wanted to make sure that it was the board issue. So I called Lennox tech support but they didn't answered the phone. I was waiting almost 2 hours. Tried next day, it was the same.
So before I replace the board, I want to make sure my diagnosis is right. Or do I have to check anything else?
I am pretty new on this board.
Thank you.
Dale
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