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04-20-2022, 06:33 AM
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#1
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Montana Fan
Join Date: Dec 2017
Location: Kerrville
Posts: 219
M.O.C. #20894
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Furnace occasionally making clunking and thunking noises
The furnace of my 2011 Montana Mountaineer occasionally makes a clunk or thunk noise.
It runs, puts out heat, but once in a while I hear a clunk or thunk. It clunks or thunks again sometimes after 10 seconds, sometimes after several minutes. Right now, the last clunk or thunk I heard was a few minutes ago.
What is this? Is this normal?
FWIW, this morning I woke up to no heat. There was barely any flame from the propane stove. I have a Fairview automatic changeover regulator that I think must not be working. I swapped the tanks and the stove burners are normal again. Also the furnace clunks and thunks are less frequent, and currently has not made a clunk or thunk since I manually swapped the tanks.
UPDATE: Pretty much after manually swapping the tanks (defective automatic changeover regulator?) the clunks and thunks from the furnace have stopped. It made the clunk and thunk noises several times after I swapped the tanks, but it's been running for about 10 minutes and hasn't clunked or thunked.
Still would like to know if those noises are normal and what they are.
__________________
2007 Dodge Ram 3500 QC LB DRW Laramie 6.7L -- Patriot Blue!
2011 Keystone Montana Mountaineer 347THT
2008 Suzuki SV650
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04-20-2022, 08:27 AM
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#2
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,135
M.O.C. #1920
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Scott, see my reply in your other post. It is likely your changeover valve. If you do a search on Amazon, the Fairview valve you have gets good reviews. This is our fourth Montana and haven’t had an issue. It’s usually the little red regulator people have issues with. Good luck.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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04-20-2022, 08:41 AM
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#3
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Montana Fan
Join Date: Dec 2017
Location: Kerrville
Posts: 219
M.O.C. #20894
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Quote:
Originally Posted by rames14
Scott, see my reply in your other post. It is likely your changeover valve. If you do a search on Amazon, the Fairview valve you have gets good reviews. This is our fourth Montana and haven’t had an issue. It’s usually the little red regulator people have issues with. Good luck.
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Oh wow. I saw that little red regulator on the hook-up side propane tank. I'll check out your reply in the other thread! Thanks.
Do you by chance have a link to the correct regulator to buy to replace the little red one?
__________________
2007 Dodge Ram 3500 QC LB DRW Laramie 6.7L -- Patriot Blue!
2011 Keystone Montana Mountaineer 347THT
2008 Suzuki SV650
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04-20-2022, 08:51 AM
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#4
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,135
M.O.C. #1920
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The main issue with the red regulator is noise. Most replace with the Marshall red regulator.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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04-20-2022, 08:55 AM
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#5
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,135
M.O.C. #1920
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This is copied from a post by Carl. He always has the info.
According to previous history and experience here, the regulator is
part # C6121#2049 30psi From Marshall controls.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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04-20-2022, 10:13 AM
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#6
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,455
M.O.C. #23668
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FWIW, the Fairview regulator in our rig failed. All of the appliances still worked except the furnace, which has a higher demand for propane flow. I ended up replacing both the main and the little red changeover regulators with Marshall Excelciors. Haven't had any problems since.
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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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04-20-2022, 11:08 AM
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#7
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,702
M.O.C. #7992
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Also see my response on your other post. It's a free and quick fix if it works. Also, FWIW,
I eliminated the little red regulator several years ago with no adverse effect on anything. I know what the specs say and the purpose of the red regulator, just sharing my results.
__________________
2006 3000RK
2009 Ram 2500
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04-20-2022, 01:01 PM
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#8
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,925
M.O.C. #5651
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Quote:
Originally Posted by jimcol
Also see my response on your other post. It's a free and quick fix if it works. Also, FWIW,
I eliminated the little red regulator several years ago with no adverse effect on anything. I know what the specs say and the purpose of the red regulator, just sharing my results.
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From what I read, it will work fine - until you are in an accident and the rod running across the front breaks off somewhere. Then you have a blow torch shooting out propane. Although, I suppose those valves in the tank should prevent it, so I don't know.
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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04-27-2022, 01:45 PM
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#9
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Montana Fan
Join Date: Nov 2011
Location: Albany
Posts: 407
M.O.C. #11972
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Once in a while I get a clunk when my furnace is running. I have concluded that it is a metal duct popping as it heats up. It normally only happens once during the heat-up cycle and once during the cool-down cycle.
__________________
2012 3150RL. G614 tires. Hardwired surge protector. Level-Up Hydraulic leveling.
2013 F-350 Lariat 6.7 PSD SRW SC LB 4X4 OEM hitch, air self-leveling on rear. 57-gallon replacement fuel tank. DieselSite water separator/fuel filter.
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