same problem
I would love to hear how it turned out. I have what appears to be identical problem except beating on out sid edidn't fix it !
Wasn't getting 12 volts to the thermostat asnd a temporary jumper form a lite switch fixed the problem for the moment. Furnace seems to want to run, however, intermittently, regardless of whether thermostat is OFF or on heat. A little unclear on the off and reset switch. Off would seem to turn the furnace off but why you would leave it in the reset mode which I am guessing is really the run mode. I have 1 2018 Thor Miramar. Took to dealer several times and no fix. eager to ehar how your problem turned out.
Thanks
Larry
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