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My coworker Brian’s furnace went out and during troubleshooting he came across a bunch of water deposits on the Bryant CES0110057-01 control board, as seen here (full res). I first suggested that he clean the deposits off with vinegar, but after doing so he found that one of the jumper wires on this single sided PCB seemed to have corroded in half, as seen above or here (full res).
He asked that I take a look at it, and in doing so I decided to replace it and the jumper next to it, as seen here. I touched up one other iffy looking solder point near the bottom of the board, but otherwise everything else looked good. He’s taking the board home to try now and hopefully this will fix the problem. A new control board for the furnace is $140, and it’d be best if he didn’t have to pay that.
UPDATE: I’ve been told that repairing this jumper fixed the problem. Yay!