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06-29-2020, 05:57 AM
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#1
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Established Member
Join Date: Dec 2009
Location: Maple Grove
Posts: 28
M.O.C. #9990
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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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06-29-2020, 06:40 AM
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#2
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,931
M.O.C. #20477
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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.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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06-29-2020, 06:50 AM
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#3
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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What do you have your fan set on? Anything but auto will cause that.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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06-29-2020, 07:18 AM
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#4
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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Quote:
Originally Posted by DQDick
What do you have your fan set on? Anything but auto will cause that.
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This is likely the issue. Set blower to AUTO.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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06-29-2020, 07:32 AM
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#5
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Established Member
Join Date: Dec 2009
Location: Maple Grove
Posts: 28
M.O.C. #9990
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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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06-29-2020, 07:58 AM
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#6
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,931
M.O.C. #20477
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May be time to take it in or get a mobile tech.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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07-03-2020, 01:16 PM
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#7
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Established Member
Join Date: Dec 2009
Location: Maple Grove
Posts: 28
M.O.C. #9990
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Fan is set in auto position
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07-03-2020, 06:16 PM
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#8
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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Quote:
Originally Posted by Rozeboom
Fan is set in auto position
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try high or low
__________________
Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
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07-03-2020, 06:23 PM
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#9
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Montana Fan
Join Date: Feb 2018
Location: Arlington
Posts: 136
M.O.C. #21176
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Mine was the circuit board.
__________________
2011 Volvo 780 485 HP/1750 TQ 13 Speed 32000 lb ET air ride hitch
2016 Montana 3820FK Legacy package
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07-07-2020, 09:19 PM
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#10
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Established Member
Join Date: May 2017
Location: ormond beach
Posts: 49
M.O.C. #19826
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My guess is the circuit board got wet
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07-12-2020, 01:55 PM
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#11
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Established Member
Join Date: Dec 2009
Location: Maple Grove
Posts: 28
M.O.C. #9990
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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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07-12-2020, 02:42 PM
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#12
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,693
M.O.C. #24086
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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.
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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07-13-2020, 09:02 AM
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#13
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Established Member
Join Date: Dec 2019
Location: Mesa
Posts: 19
M.O.C. #25527
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Quote:
Originally Posted by Rozeboom
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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Have 2012 3750FL and had same problem. Tech found pinched wire and replaced.
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