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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: 57
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: 3,727
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: 18,792
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: 57
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: 2,407
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: 57
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: 376
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: 30
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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06-10-2023, 04:55 AM
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#10
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Established Member
Join Date: Jan 2019
Location: Grapevine
Posts: 38
M.O.C. #23255
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when this happened to us, it was the control board in the furnace that was bad.
__________________
Scott & Luanne
Grapevine, Texas
2017 RAM 3500 Longhorn DRW
2019 Montana 3121 RL
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06-10-2023, 04:56 AM
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#11
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Established Member
Join Date: Jan 2019
Location: Grapevine
Posts: 38
M.O.C. #23255
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when this happened to us, it was the control board in the furnace that was bad. We had a tech come out and swap out the board.
__________________
Scott & Luanne
Grapevine, Texas
2017 RAM 3500 Longhorn DRW
2019 Montana 3121 RL
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06-20-2023, 09:44 AM
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#12
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Established Member
Join Date: Jan 2021
Location: Easton
Posts: 23
M.O.C. #27975
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I just had the same issue. I noticed that hornets where trying to make a nest inside. I final got it running and smoked the hornets out. Now my vent is covered with a screen to prevent this issue.
I saw them flying through the exhaust tube and started to create a hive inside on the cover.
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06-21-2023, 10:07 AM
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#13
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Seasoned Camper
Join Date: Jul 2005
Location: ringgold
Posts: 53
M.O.C. #4165
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I had similar problem after checking everything I could think of. I removed the burner and most of the holes in the burner were rusted. I used a small wire and cleared all the holes then brushed with wire brush. Then I sprayed it with WD40 then blew it out with air. Reassembled and it has worked fine
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06-21-2023, 11:56 AM
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#14
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Montana Master
Join Date: Jun 2017
Location: POINTBLANK
Posts: 1,814
M.O.C. #19944
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Quote:
Originally Posted by GrahamLock
Thanks all. I will return the unit to the dealer to replace whatever isn't working.
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If you can be without out is so long ... just saying
__________________
 RAM 22' DRW 3500 Crew LB 40 gal reserve tank / RETRAX Bed Cover / 2020 373RD HC
MOPEKA Tank Monitor / Furrion Side&Rear Cameras
Slide Toppers / EMS-HW50C / Sailun 85's
3rd AC / Dometic 320
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