Ignition Control Board Fried, No AC After Board Replacement

[Darkojin]

We have a Goodman GMS80804BNBC with NEST Learning Thermostat. The ignition control board fried (PCBBF123) so we got a replacement that says it is compatible (50A55-743), but the AC would not turn on after plugging in everything where it looks like it should go. We found out that the blower motor was burned out so we replaced that as well, with the same part number. The wiring was matched up to the way it was on the previous board based on where the wires were and the markings on the board, but it seems wrong based on wiring guides I have found and was hoping that someone here might be able to figure this out and save us the trouble of having to call in expensive repairs. At this point, my best guess is that board is not actually compatible or needs to be wired up differently, and have ordered a new board that matches the original one.

Unsure how to share pictures directly, so here is Google Drive folder with photos of the wiring, including for the thermostat. Google Drive 

[aguilarmateo]

hi Darkojin, 

Sorry to hear the situation that you are experiencing with your Nest thermostat, I know it could be frustrating, but I'm here to help! You can contact our support department for further assist: Contact us

Let me know if you have any questions. 

Best regards, 

Chris

[Darkojin]

We got it figured out, it was the board that was the issue. While the instructions for it said it was a replacement for our original board, it had some of the resistors in the wrong locations so it was not working for us. A new board that was a direct replacement of the original board and everything works just as it did before.