Duo Therm Thermostat Issue?

Question

Last night, at 25 degrees outside, we were running our Duo-Therm on furnace mode. At 2 a.m., I woke up very hot and went into the living room area to turn down the thermostat. No matter how low I turned it, the furnace wouldn't cycle off. Finally I just turned the whole thing off. Woke up DH, who went outside and looked at the heater, and all seemed fine - no overheating or any other noticeable issues. After a while, we turned it back on and it worked fine. Cycled on and off normally for a half hour and we went back to bed. This morning it was still fine.

Has anyone else experienced this? Could it be any sort of furnace problem? Is it a precursor to the thermostat going out? Any other explanations? Thanks.

nemo45 · Answer

The blower will not go off immediately and will run until furnace bonnet reaches a set temperature allowing it to cool down.

enblethen · Answer

It does take some time for the furnace to cool down before the fan will shut off.
Does the thermostat work both the AC units and furnace?
You could have a failing thermostat. Remove the cover and see if you can find make and model of the thermostat.
Some thermostats can be reset by removing the fuse.

pompomgirl · Answer

That was the first thing DH said.  I had given it PLENTY of time to cool down.  I was roasting to the point of sweating while he slumbered on, and the thermostat was set to 63. It's a standard Duo-Therm thermostat.  I wouldn't be surprised if that is the case - lots of things on this coach date back to 1997. We got it with three smoke/CO detectors, and they were dated 2014, 2010, and 1997 (the one over the bed, argh).  The 1997 one has been replaced.

lj2654 · Answer

yep, sounds like a thermostat going, had to replace mine last year and put a digtal one in with a new control box.

dutch_12078 · Answer

A couple of RV's ago, I had a Duo-therm thermostat do the same thing. The contacts controlled by the bi-metal coil had welded together. I was able to separate them and dress the contacts with a matchbook striker, allowing the furnace to operate normally until I could locate a replacement. In our newer RV's, I've replaced the mechanical thermostats with Honeywell digitals as one of the early changes I make as soon as we get them.

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Duo Therm Thermostat Issue?

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