Originally Posted by trailraider
Shut the t-stat off,killed the main breaker, the furnace breaker( same as inverter) and it continues to run.
You have a circuit breaker on your furnace???
Circuit breakers are typically for 120 V items like outlets and
microwave and roof AC.
Things like the furnace blower are 12 v and have blade FUSES.
As mentioned try pulling the furnace FUSE and it will stop.
You might try giving the control board a whack as it could be a stuck
I had a previous trailer that had a furnace that would come on by itself
even if the Thermostat was turned off.
I pulled it off the wall to replace it and found the installer had stripped
the wires way long on the back and 2 wires were touching.
It could be a stuck relay or a short in the thermostat wire due to a screw
stuck thru the wire or poor connection that's shorting together either
at the T-stat end or the furnace end.
Having said all that if you pull the right fuse it will stop unless it's
haunted or something
Please tell us what you find.