Dometic thermostat problems

[Kirk W]

8 hours ago, Bojack said:

Hey my furnace won’t turn off,

Welcome to the forums! It would help a great deal if you would tell us that make and model of the furnace you have and also of the thermostat. Posting pictures also may help. 

A typical RV furnace is controlled by a single pair of wires that go from the furnace to a thermostat of some type for control. If one removes the two wires and shorts them together it will do exactly what you describe so the most likely cause of the problem is your thermostat. I would first take the thermostat from the wall and remove the two wires to see if that doesn't resolve the problem. If it does we then figure out what is wrong with the thermostat If it does not, there are possibilities inside of the furnace or in the wires between the thermostat and the furnace. More information is needed to go beyond this. 

[clark261]

If you can't turn on your heater or air conditioner, your thermostat might be broken. Dead batteries or wiring problems can occasionally be the cause of power outages. The thermostat is unable to send and receive electrical signals due to wiring issues, which makes it ineffective.

Despite attempts to turn the heater or air conditioner off, defective thermostats frequently blast them continuously. The cause in this situation can be faulty thermostat calibration or frayed wiring.

To inspect the wiring for damage, you can remove the thermostat from the casing. If you don't observe any damage, you can either have the device professionally inspected or just obtain a new one.