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Old 02-16-2013, 04:47 PM   #1
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Help... Furnace Fan Won't Shut Off!

We just got back last weekend from a trip and we did use the furnace quite a bit. We've had it sitting in front of the house... No issues and I vacuumed and we took off to take it to where we store it.

We have the Duo Therm Comfort Control thermostat that was turned off. Shortly after starting to drive the fan came on and started blowing cool air out of the heater vents. It won't shut off. Thermostat is on "off", we tried pulling the fuse (the one that says "air conditioner controller", and nothing, the only thing that works is shutting off battery power. Got to our location and even plugged in with shore power the only way we can get it to stop running is to have both the battery power shut off on "store" and the circuit breaker that says "conv." turned off.

Any ideas?
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Old 02-16-2013, 04:55 PM   #2
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Sorry, I can't help with that, but I am sure others will chime in with the info you need.
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Old 02-16-2013, 05:46 PM   #3
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We've tried turning the heat up on the thermostat and the heat won't kick on, just keeps blowing cool air. Air conditioner that is controlled by the same thermostat seems to work ok. So strange as the heater worked fine last weekend.
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Old 02-16-2013, 05:48 PM   #4
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Do you have the fan set to Auto or one of the manual settings (High, Medium, Low)?
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Old 02-16-2013, 05:51 PM   #5
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On the thermostat , does it have a switch marked FAN-AUTO or ON. If it does, turn it to AUTO.
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Old 02-16-2013, 06:08 PM   #6
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Ok weird but we replaced the furnace fuse, pulled it and it at least shut off. Doing further research it looks like it may be a bad fan relay,
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Old 02-16-2013, 06:10 PM   #7
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We had tried all settings...auto on and fan off. With the thermostat on OFF it was still running
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Old 02-16-2013, 06:11 PM   #8
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I swear every time we take this thing out something goes wrong!
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Old 02-17-2013, 05:55 PM   #9
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Quote:
Originally Posted by Blonda View Post
I swear every time we take this thing out something goes wrong!
That the joy. Every new trip is an adventure !!
Just don't let it get to you .
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Old 02-17-2013, 06:00 PM   #10
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sounds like a contactor / fan motor relay is stuck
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Old 02-25-2013, 08:49 PM   #11
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Well I wanted to report back that after having the fuse pulled for a couple hours it's now working fine. It must have been the relay and took awhile for the current to clear.
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Old 02-26-2013, 09:24 AM   #12
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Good to hear its working, may want to check the wiring in the 12v fuse panel for loose wiring screw connections on both the battery and negative ground leads on buss bar they have a tendency to loosen out from road vibration.
Check all your wire connections every spring before travels both 12v and 110 wires in load center and transfer switch.
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Old 02-26-2013, 09:38 AM   #13
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Blonda, recheck the setting on your thermostat. Ours has low, high, auto. Auto will shut off the fan, low and high will NOT shut off the fan. These two settings are for continus fans no matter what. This is the way ours works with a Atwood thermostat.
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Old 05-13-2013, 12:26 PM   #14
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So glad I googled this. I too have a furnace fan runnig in my Itasca that won't shut off. Runs in Auto or high and low. I'll get hubby to pull the fuse and see what happens. We are just starting up for the season and usually there is something. Just had it in for a $K of work on an exhaust leak. Everything else seems to be OK. So glad I found you guys.
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