I hope it's just the thermostat in your case. For me, not so lucky.
I chased it down to being a shorted circuit in the ceiling somewhere between the roof mount A.C. unit control box to the furnace. I ended up having to run a new dual lead/single wire from the furnace through the corners of a cabinet and up into the ceiling. Once in the ceiling I was able to fish the wire utilizing speaker and lighting holes to get it to the control board area in the AC unit where I tapped into the original circuit from the thermostat.
I figured it out by disconnecting the thermostat after the furnace started and it kept running. I then disconnected the 2 leads at the furnace and using a meter I Ohm'ed out the thermostat to furnace leads. That's when I confirmed they were shorted together. Then I disconnected the leads at the AC unit and was able to narrow it down to be shorted from the AC box to the furnace.
The cause is undetermined. But, it may have been a staple or a rodent are my two guesses. With no signs of rodents at the time I think it was a staple that was shot through the wire because at the time of diagnosing it I pulled the wire as hard as I could in the ceiling and the furnace clicked off once.
Good luck with your findings.
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*Current: 2005 Ford F350 Crew Cab Dually 6.0 diesel 4x4*
*Retired: 1987 F350 Crew Cab Dually 6.9 turbo diesel
2007 Forest River WildCat 32QBBS
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