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04-26-2022, 12:32 PM
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#1
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Established Member
Join Date: Mar 2018
Location: KANKAKEE
Posts: 27
M.O.C. #21356
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Furnace not lighting
Have 2018 HC 305 Furnace not lighting. Battery is good, have Domtec digital thermostat, it looks to be okay, everything else it effects runs. I believe I have plenty of propane. Any suggestions appreciated. The trailer is 50amp but I only have 30amp where I am at.
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04-26-2022, 03:41 PM
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#2
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,455
M.O.C. #23668
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What exactly is it doing when you set the TStat for heat? Fan blow? Try to ignite but doesn’t? Ignites but turns right off? Ignites and runs for several minutes then shuts off?
If the fan is blowing and not igniting, or attempting to ignite then the first thing to check is the sail switch. It’s easily accessible on your rig (same as mine). It could just be dirty and need to be cleaned.
__________________
Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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04-26-2022, 03:52 PM
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#3
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Established Member
Join Date: Mar 2018
Location: KANKAKEE
Posts: 27
M.O.C. #21356
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Thank you for your reply. Where would I see the sail switch?
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04-26-2022, 03:57 PM
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#4
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,455
M.O.C. #23668
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When you pull the exterior panel you can see it. It’s screwed in with 2 screws and should have 3 wires attached. Just unscrew it and pull it out of it’s opening far enough to see the contacts. If there’s lint or dirt in the way it should be fairly obvious. Just blow or brush it out. Make sure it looks clean and moves freely. Reinstall it and try again.
You can look up videos on the subject as well to make sure you know what you’re looking for. This troubleshooting step is a very easy one to check. There is an on/off switch also in that vicinity when you pull the cover off. Make sure it’s on.
If that doesn’t solve it then please report back on exactly what it does when you first set your TStat.
__________________
Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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04-26-2022, 05:08 PM
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#5
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,323
M.O.C. #4831
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There are several manuals in the Files Section that might help you figure out what is what and what is wrong. Here are three of them:
atwood propane furnace.pdf
Atwood Furnace Training Manual
RV Furnace Troubleshooting.pdf
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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04-27-2022, 09:36 AM
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#6
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Montana Master
Join Date: May 2018
Location: livingston,tx
Posts: 558
M.O.C. #21685
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Quote:
Originally Posted by slangvel
Have 2018 HC 305 Furnace not lighting. Battery is good, have Domtec digital thermostat, it looks to be okay, everything else it effects runs. I believe I have plenty of propane. Any suggestions appreciated. The trailer is 50amp but I only have 30amp where I am at.
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Remove your furnace cover and check the exhaust tube with a flashlight, I have found that to be the issue 99.9 % of the time, dirt dabber nest restricting the exhaust air flow.
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05-11-2022, 03:34 PM
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#7
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Seasoned Camper
Join Date: Oct 2019
Location: Peoria
Posts: 80
M.O.C. #25158
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Exactly
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05-12-2022, 05:00 AM
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#8
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,117
M.O.C. #25165
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In addition to dirt dobbers, we have tiny white spiders in the southeast and even a small spider web will block the air flow enough to prevent ignition.
__________________
Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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05-19-2022, 07:21 PM
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#9
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Established Member
Join Date: Mar 2020
Location: Hampton
Posts: 24
M.O.C. #26030
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Sail switch. They are finicky things and can get stuck open with cat and dog fur, dust, hair, etc..... Jump the switch terminals with a paper clip for 15 seconds while the fan is running to see if the furnace lights. I keep an extra one in my tool kit just in case. You can try to blow it out with a spray cleaner in a pinch. Sometimes you have to bend the sail ever so slightly to force the switch to close, but not so much that the sail hits the fan.
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