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In this Troubleshooting session we find a thermostat ( 9420A381) set to heat, furnace kicks on, and lights for 7 seconds then shuts off. We find that the thermostat started out with good voltage out on the white signal wire but it slowly dropped from 12.2V to 3V. There is an internal issue with the thermostat so we replace it. Check it out.
Here we have a Dometic 3 button thermostat (3316250.712) would intermittently turn on at night and stay on regardless of set temp. The customer would wake up in a sauna. Adjusting the temp down under current temp on the thermostat didn’t change the result. I like to call this the run a way furnace. The replacement part we installed (3316230.714) is a kit and comes with the 3 button thermostat and control box.