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09-18-2020, 09:13 AM
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#1
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Established Member
Join Date: Apr 2020
Location: Smithfield
Posts: 25
M.O.C. #26123
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Furnace won’t ignite
Hey everyone.
I have an Atwood AFMD 35131 Furnace.
When I turn the thermostat on I either get cool air blowing (instead of hot) or it just shuts off.
Circuit board has no blinking lights indicating “Internal Control Failure”. What does this mean to me? I tried cleaning up the circuit board the best I could but it already looked pretty clean. I also checked the sail switch which was clean.
Do I just need a new circuit board? Easy enough for a novice to complete?
Thanks!
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09-18-2020, 09:23 AM
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#2
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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You don't say what year rig you have. When our 2017 had that problem last winter the sail switch needed to be replaced. They had a batch of bad ones and never told anyone. I had thought it was a control board also, but replacing that didn't fix it, replacing the sail switch did.
__________________
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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09-18-2020, 09:25 AM
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#3
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Established Member
Join Date: Apr 2020
Location: Smithfield
Posts: 25
M.O.C. #26123
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Thanks for the reply.
It’s a Montana 375FL.
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09-18-2020, 09:40 AM
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#4
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,710
M.O.C. #7992
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__________________
2006 3000RK
2009 Ram 2500
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09-18-2020, 09:42 AM
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#5
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,710
M.O.C. #7992
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For future reference there are several manuals downloaded to this forum. You can find them here: https://www.montanaowners.com/forums/downloads.php
__________________
2006 3000RK
2009 Ram 2500
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09-18-2020, 09:47 AM
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#6
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Established Member
Join Date: Apr 2020
Location: Smithfield
Posts: 25
M.O.C. #26123
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Thanks. I did look over the manual. Just not sure how to proceed.
I guess I need a volt meter if I’m going to further diagnose.
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09-19-2020, 09:06 AM
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#7
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Established Member
Join Date: Apr 2020
Location: Smithfield
Posts: 25
M.O.C. #26123
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Update to close thread.
Pulled the burner out and it was significantly corroded.
Cleaning it up with a wire brush and it is now igniting and running perfectly.
I noticed water in the furnace when I took the cover off.
I had a bug screen on over the exhaust. I’m now learning these screens can promote the entry of water into the exhaust, leading to my issue.
Thanks for the replies guys.
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09-19-2020, 10:09 AM
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#8
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Montana Master
Join Date: Oct 2015
Location: westminster md
Posts: 2,325
M.O.C. #17894
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Quote:
Originally Posted by Gbailey9099
Update to close thread.
Pulled the burner out and it was significantly corroded.
Cleaning it up with a wire brush and it is now igniting and running perfectly.
I noticed water in the furnace when I took the cover off.
I had a bug screen on over the exhaust. I’m now learning these screens can promote the entry of water into the exhaust, leading to my issue.
Thanks for the replies guys.
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There are several other treads addressing water in those atwood furances. Shearch the forum.
__________________
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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09-19-2020, 10:27 AM
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#9
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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 Gbailey9099
Update to close thread.
Pulled the burner out and it was significantly corroded.
Cleaning it up with a wire brush and it is now igniting and running perfectly.
I noticed water in the furnace when I took the cover off.
I had a bug screen on over the exhaust. I’m now learning these screens can promote the entry of water into the exhaust, leading to my issue.
Thanks for the replies guys.
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I've always had bug screens on my furnace(s) and never a problem with water entering. BTW it is helpful for people to have year, make, and floorplan to help in the future. Might want to add a signature with this information.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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09-19-2020, 03:50 PM
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#10
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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Good job. Thanks for the follow up. None of us figured on that to be the fix.
__________________
2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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09-19-2020, 08:01 PM
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#11
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,782
M.O.C. #24086
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Others have made covers for the furnace vent. I did the same.
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