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ComfortMaker Furnace Problem
My 10 year old Comfortmaker a/c and gas furnace have a problem; here is the issue:
Due to severe electrical surges two transformers blew out on the original Honeywell ST9120 circuit board. The last time it blew the circuit board itself. So i purchased a new board which is a universal replacement and has its own on-board diagnostic. I installed the board and when I fired it up it began to give one flash which means open limiter switch.
I do not know what that is so I just checked all of the switches that measure heat or whatever and they all test the same for values. Also, the new board is not a direct replacement and the wiring diagram for it is slightly different so I am not sure I have the new board wired correctly. I had left off one of the wires because I was not sure where it went---it is the fat white wire coming from the blower, along with the other fat ones, red, orange, black and blue. I thought the white wire should go to neutral on the board, but it show having 120v when the switch is closed for operation.
Anyone who can help me with this rats nest? I could not get local help and the temperature is dropping---just before the last surge, everything worked beautifully. Can submit many photos if needed.
Thanking in advance.......
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