Problem with lp furnace
It sounds more like a bad control board. RV furnaces don't have a thermocoupler per say. Gas valve is controlled by board after 12V goes through a high limit switch and a sail switch.
When you call for heat at the thermostat the furnace fan starts. 12V is then sent through a ceramic sensor that will stop flow of electricity if the temp in the furnace is too high. Then the voltage has to pass through a sail switch. The sail switch is a long metal tab that sits in the path of the fan and when it's spinning fast enough to produce enough flow it will cause the tab to push the contacts together.
At that point the signal is back to the board and it will then open the gas valve and spark. Once a flame is sensed at the sparker the igniter stops.
Shutting everything off "resets" the board. I'm not saying that IS your problem but most likely is and further testing would confirm.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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