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03-26-2023, 08:56 AM
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#1
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Seasoned Camper
Join Date: Oct 2019
Location: Canmore
Posts: 54
M.O.C. #25190
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Furnace not lighting up
We have a 2019 3120RL and recently the furnace stopped working. When I turn it on via the Dometic thermostat, the fan comes on as it should, but the furnace does not light. I reset the thermostat to factory settings, and that didn't solve the problem. The fan comes on, runs for a bit, then shuts off, then on again, etc. Yesterday it worked fine. Today the above. Any ideas?
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03-26-2023, 10:22 AM
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#2
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,622
M.O.C. #20477
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Graham,
Here is a troubleshooting guide load in the files section: https://www.montanaowners.com/forums...?do=file&id=11
Sounds like a sail switch or gas flow issue.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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03-26-2023, 11:36 AM
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#3
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,784
M.O.C. #11455
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I'd bet on the sail switch, common issue.
__________________
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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03-26-2023, 11:54 AM
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#4
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Seasoned Camper
Join Date: Oct 2019
Location: Canmore
Posts: 54
M.O.C. #25190
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Furnace Issues
Thanks all. I will return the unit to the dealer to replace whatever isn't working.
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03-26-2023, 12:57 PM
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#5
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,257
M.O.C. #24086
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Classic sail switch symptoms.
Here's a YouTube video showing how to remove and clean it.
However, sometimes it's a bad black 15A self resetting furnace fuse.
Try swapping it with a regular blue 15A one first.
If that doesn't work, remove and clean the sail switch.
If you determine it's bad here's the info to order a new one.
New sail switch kit part number 33082 which replaces old part number 33063.
Dometic part number 33082
https://www.amazon.com/33082-sail-Sw...95095564&psc=1
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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03-26-2023, 04:48 PM
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#6
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Seasoned Camper
Join Date: Oct 2019
Location: Canmore
Posts: 54
M.O.C. #25190
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Furnace Issues
Quote:
Originally Posted by AZ Traveler
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Thanks to all for the suggestions. I'm still under warranty and headed home, so I'll get the dealer to fix it.
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04-02-2023, 01:19 PM
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#7
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Montana Fan
Join Date: Jun 2018
Location: Jacksonville
Posts: 373
M.O.C. #21993
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Had the same issue, turned out to be the thermal auto reset (Black 15 amp) fuse in the fuse box (there are two), was tripping too early. Replaced it with a blue 15 amp and fixed the issue.
__________________
I was once intelligent beyond my years. Now, I’m years beyond my intelligence.
2020 Montana 3561 Legacy, everything except paint.
2018 Silverado 3500 DRW, 50Gal Transfer Flow, Andersen hitch.
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04-02-2023, 01:36 PM
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#8
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Established Member
Join Date: Jun 2017
Location: Greenville
Posts: 26
M.O.C. #19958
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I am predicting an igniter issue.
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04-03-2023, 08:04 AM
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#9
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New Member
Join Date: Jun 2019
Location: Bushnell
Posts: 7
M.O.C. #24362
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I was out in New Mexico and I could hear mine clicking but not lightning, turned out to be the gap in the igniter. Works great now!
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