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Old 05-01-2022, 04:29 PM   #1
phillyg
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Furnace Comes on by Itself

What the title said. Thermostat is off. The furnace blower started up. Had to pull the furnace fuse to stop it. Happened twice now and I removed the fuse and left it out. WTH????
 
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Old 05-01-2022, 05:46 PM   #2
rohrmann
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I'm thinking maybe the actual furnace isn't running, but possibly just the blower fan is running. Possibly the thermostat switch on the fire box is defective and telling the furnace the firebox is hot and needs the fan to cool it off, just like when the furnace turns off but the fan continues to run for a bit after the flame turns off. Might be a problem on the circuit board too. This is the link for the troubleshooting guide on the this site: https://www.montanaowners.com/forums...?do=file&id=11
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Old 05-02-2022, 06:13 PM   #3
DQDick
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Is the heat pump or AC in use when this happens. If so you may have your fan set on high or low instead of auto.
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Old 05-03-2022, 07:39 AM   #4
phillyg
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Originally Posted by DQDick View Post
Is the heat pump or AC in use when this happens. If so you may have your fan set on high or low instead of auto.
No, the thermostat was in the off position, and it was 85 degrees outside.
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Old 05-12-2022, 06:47 PM   #5
dfb
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Originally Posted by phillyg View Post
No, the thermostat was in the off position, and it was 85 degrees outside.
What position is the fan? Fan will run with heat or air or without..
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Old 05-13-2022, 08:20 AM   #6
phillyg
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What position is the fan? Fan will run with heat or air or without..
The fan is set on auto, should the thermostat be on, but neither the AC nor furnace was on. It hasn't happened again, so the mystery goes unsolved.
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Old 05-13-2022, 03:37 PM   #7
dfb
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Originally Posted by phillyg View Post
The fan is set on auto, should the thermostat be on, but neither the AC nor furnace was on. It hasn't happened again, so the mystery goes unsolved.
Fan may have off position..
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Old 05-15-2022, 01:52 PM   #8
mleeder
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Furnace comes on by itself

Had this happen often. Pull into a new site only to find the heater had been running. Bottom line was the wires on the thermostat were loose.
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