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Old 06-29-2020, 05:57 AM   #1
Rozeboom
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Furnace

Does anyone know why furnace blower never stops blowing even when thermostat is off domestic thermostat duo
 
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Old 06-29-2020, 06:40 AM   #2
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Try turning off all power to your rig including disconnecting the battery. Does it come back on when you turn the power back on?

Recommend you add info on your model to your signature box or put it in your profile to help folks diagnose.
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Old 06-29-2020, 06:50 AM   #3
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What do you have your fan set on? Anything but auto will cause that.
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Old 06-29-2020, 07:18 AM   #4
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What do you have your fan set on? Anything but auto will cause that.
This is likely the issue. Set blower to AUTO.
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Old 06-29-2020, 07:32 AM   #5
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2016 Montana 3721 domestic furnace all power has been shut off both thermostats are on auto have installed new control board and new sail switch furnace blower runs all the time does not make any difference where thermostat is set. Off fan cool furnace blower runs constant
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Old 06-29-2020, 07:58 AM   #6
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May be time to take it in or get a mobile tech.
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Old 07-03-2020, 01:16 PM   #7
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Fan is set in auto position
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Old 07-03-2020, 06:16 PM   #8
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Originally Posted by Rozeboom View Post
Fan is set in auto position
try high or low
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Old 07-03-2020, 06:23 PM   #9
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Mine was the circuit board.
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Old 07-07-2020, 09:19 PM   #10
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My guess is the circuit board got wet
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Old 07-12-2020, 01:55 PM   #11
Rozeboom
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Just had that issue with my 2016 3075. Control board universal board about 100 bucks make sure jumper pin is correct
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Old 07-12-2020, 02:42 PM   #12
Daryles
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sometimes mine does that. Pull the fuse, count to 10. Put fuse back in. This is the same as pressing the reset button outside.
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Old 07-13-2020, 09:02 AM   #13
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Originally Posted by Rozeboom View Post
2016 Montana 3721 domestic furnace all power has been shut off both thermostats are on auto have installed new control board and new sail switch furnace blower runs all the time does not make any difference where thermostat is set. Off fan cool furnace blower runs constant
Have 2012 3750FL and had same problem. Tech found pinched wire and replaced.
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