Hi all,
I have a Trane XR80 furnace with a control board 50A65-475 (attached). I've taken some photos of what looks like corrosion/burn marks.
Symptoms:
My heat stopped working but the inducer fan would kick on and off. The system turns and the diag LED flashes 3 times then pauses which notes a pressure switch failure.
Steps I took to narrow to the IC board.
1: Tested the pressure switch with multimeter, no continuity when off, when the inducer fan runs I have continuity so it seems the switch is functioning properly
2: I inspected/removed inducer fan and cleaned area/cleaned nipple where switch connects, all seems good there.
3: I tested voltage to the pressure switch after the inducer fan kicks on. Here's the gotchya/weird part.
a: If I just use a jumper wire to call for heat on the system, the pressure switch does not get 24v like expected for a second or two.
b: If I push slightly on the IC board while jumpering, flexing the board a bit, I get 24v to the pressure switch momentarily as expected and I also get ignition and the system starts heating.
Question: obviously there's something off with the board and ordering a new one is the best route, however I can't get one for a few days at minimum and it got down to -1 here last night in Colorado. Wondering if anyone has ever tried to debug/solder or find clues as to how to debug these boards? I see what looks like corrosion on mine as well as some darker marks on the back side, but I don't see any halo'd solder joints on the back.
Any ideas I'm open to, I just need heat for a few days until the new board gets here.
Thanks!
I have a Trane XR80 furnace with a control board 50A65-475 (attached). I've taken some photos of what looks like corrosion/burn marks.
Symptoms:
My heat stopped working but the inducer fan would kick on and off. The system turns and the diag LED flashes 3 times then pauses which notes a pressure switch failure.
Steps I took to narrow to the IC board.
1: Tested the pressure switch with multimeter, no continuity when off, when the inducer fan runs I have continuity so it seems the switch is functioning properly
2: I inspected/removed inducer fan and cleaned area/cleaned nipple where switch connects, all seems good there.
3: I tested voltage to the pressure switch after the inducer fan kicks on. Here's the gotchya/weird part.
a: If I just use a jumper wire to call for heat on the system, the pressure switch does not get 24v like expected for a second or two.
b: If I push slightly on the IC board while jumpering, flexing the board a bit, I get 24v to the pressure switch momentarily as expected and I also get ignition and the system starts heating.
Question: obviously there's something off with the board and ordering a new one is the best route, however I can't get one for a few days at minimum and it got down to -1 here last night in Colorado. Wondering if anyone has ever tried to debug/solder or find clues as to how to debug these boards? I see what looks like corrosion on mine as well as some darker marks on the back side, but I don't see any halo'd solder joints on the back.
Any ideas I'm open to, I just need heat for a few days until the new board gets here.
Thanks!
source https://hvac-talk.com/vbb/showthread.php?2223413-Any-way-to-repair-ignition-control-board-on-furnace&goto=newpost
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