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11-12-2020, 10:42 AM
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#1
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Montana Master
Join Date: Sep 2017
Location: Willis
Posts: 896
M.O.C. #20587
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Furnace Intermittant
While camping in Central Texas, noticed the furnace would sometimes fail to light and after a few tries would lock out. Checked the normal stuff, tanks, found out how to check manifold pressure, no spark, sail switch okay, etc. After using the fireplace (it was only low of 39) for couple days and fooling around, found the stacon spade connectors on the limit switch were corroded enough to have high resistance. You need a long pair of needle nose to reach it. Once those were clean, all was good. Those little spades are somewhat exposed to the outside environment and only 12 volt so easy to get low voltage across if slight oxidation. Just a heads up for the MOC folks.
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2018 Montana 3791RD (SOLD)
2017 Ram 3500 DRW 6.7 Cummins Aisin, B&W RVK3600 (SOLD)
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11-12-2020, 11:48 AM
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#2
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,707
M.O.C. #7992
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Good find. Thanks for sharing
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2006 3000RK
2009 Ram 2500
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11-12-2020, 12:56 PM
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#3
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,468
M.O.C. #23668
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Good reminder to check the easy things first. It's nice when it's a simple fix...frustrating when it takes a couple days to figure it out. Thanks for the heads up.
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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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12-05-2020, 05:57 PM
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#4
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New Member
Join Date: Nov 2020
Location: Pingree
Posts: 2
M.O.C. #27475
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So I have sort of the same issue. 2020 Montana high country 362RD. The furnace blower will start but then it won’t light and after about 30 seconds the blower shuts off and it flashes an error code. I go out reset the blower and it will run the blower for 30 seconds and then quit. I finally started pulling wires off to check power and I removed 1 wire off the sail switch and then put it back on and the furnace lit and ran great. About every day this happens and I have to go out and repeat this process. Any ideas why this is happening and why would pulling off 1 wire and then putting it back reset everything?
Also the 15 amp fuse on the panel for the furnace will heat up and trip (Has a thermal fuse). Don’t understand why it’s doing this. I will remove the fuse, let it cool down to touch, put it back and then it doesn’t heat up
Any advice???
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12-05-2020, 06:48 PM
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#5
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,318
M.O.C. #17894
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There are a few threads on water entering Atwood furnaces from the outside cover. Do a search.
__________________
2018 Chevy 3500 LTZ Dually Diesel 4x4 CCLB
2011 Montana 3455 SA. 6 point level up. Disc brakes. Curt Q24 Hitch. 5 step glow steps
Progressive EMS. Valterra tank valves. Sailun G637 tires. ARP fridge control. All led lighting. Mor Ryde IS
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12-05-2020, 08:17 PM
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#6
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New Member
Join Date: Nov 2020
Location: Pingree
Posts: 2
M.O.C. #27475
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Redo
Quote:
Originally Posted by VO_VOYAGER
So I have sort of the same issue. 2020 Montana high country 362RD. The furnace blower will start but then it won’t light and after about 30 seconds the blower shuts off and it flashes an error code. I go out reset the blower and it will run the blower for 30 seconds and then quit. I finally started pulling wires off to check power and I removed 1 wire off the sail switch and then put it back on and the furnace lit and ran great. About every day this happens and I have to go out and repeat this process. Any ideas why this is happening and why would pulling off 1 wire and then putting it back reset everything?
Also the 15 amp fuse on the panel for the furnace will heat up and trip (Has a thermal fuse). Don’t understand why it’s doing this. I will remove the fuse, let it cool down to touch, put it back and then it doesn’t heat up
Any advice???
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Started before we got into any wet weather
__________________
[SIGPIC]
2019 GMC SIERRA 3500 BANKS DERRINGER 6” BDS LIFT
2020 MONTANA HIGH COUNTRY 362RD
ME, THE WIFE, 3 KIDS & 2 DOGS
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12-06-2020, 03:47 AM
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#7
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,137
M.O.C. #25165
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Don't discount it anyway. We hadn't had any wet weather when we got our new unit, but it turned out that someone at the dealership used a pressure washer to clean it up before we did our PDI. Water came in through the vent over stove and water got into the furnace, too. May not be your issue, though.
__________________
Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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12-06-2020, 06:41 AM
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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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C'mon it is not that cold here yet for the furnace. The Fireplace should be enough.
Thanks for the info
__________________
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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