A few months ago, I had someone working on my outdoor a/c unit, and he accidentally shorted out the control board in the furnace (it's a Goodman gas furnace GKS91155DX). He replaced the board, and the a/c did end up working, but when I tried to start the heat today, the burners would not stay on for longer than a few seconds before cutting out.
After ruling out the usual culprits (flame sensor, bad ground, etc.), I turned my attention to the control board, and after a little research I came to realize that it was the wrong board! The one in my furnace was PCBBF122, while the one listed in the service manual for my model is PCBBF112.
Does anybody know whether these boards are generally interchangeable? The terminals are mostly the same, except that the "wrong" board has 2 extra terminals -- one for "LO HEAT" and the other for "EAC-H".