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09-24-2016, 04:29 PM
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#1
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3 Rivet Member
2012 25' FB Flying Cloud
Parker
, Colorado
Join Date: Aug 2015
Posts: 131
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Furnace not very hot
Was in the Colorado high country last week, got down to 30 degrees and the furnace in my 2012 25 flying cloud ran all night without shutting off with temp set at 60. Air is warm coming out of the vents, but not as hot as last year. I've been in colder temps and has worked just fine. Any ideas for a fix?
I opened the outside cover and cleaned out any lint and dirt I saw, with no change. Thanks for your help.
__________________
2012 25FB with solar
2012 Toyota Tundra 5.7L V8
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09-24-2016, 04:55 PM
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#2
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Rivet Master
2016 25' Flying Cloud
Venice
, Florida
Join Date: Apr 2015
Posts: 1,024
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Temp may be set to low, 30 outside in not extremely cold so 60 inside & working not to hard sounds normal to me. Another possibility is you low on gas causing poor gas pressure to the furnace.
__________________
Joe
Venice, FL
2016 FC 25RTB
TAC FL-47
2018 Nissan Titan XD Cummins Diesel
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09-24-2016, 05:35 PM
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#3
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4 Rivet Member
2017 25' Flying Cloud
Gold Country
, California
Join Date: May 2015
Posts: 334
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I'm interested to know what the issue is, please keep us informed.
Have you tried it again at lower elevation? Did you have the fan set to "on"? (Not sure if that's even an option)
It seems very strange that it would work, but not well
Good luck!
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09-24-2016, 06:08 PM
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#4
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Rivet Master
1991 34' Excella
Princeton
, New Jersey
Join Date: Aug 2003
Posts: 7,070
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The furnace should have cycled given that temperature difference unless something, a window, was wide open.
I would call the manufacture and ask what could reduce the BTU input.
__________________
WBCCI 12156 AIR 3144 WACHUNG TAC NJ6
2004 Excursion 4x4
1991 34 ft. Excella +220,000 miles, new laminated flooring, new upholstery, new 3200 lbs axles
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09-24-2016, 06:28 PM
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#5
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4 Rivet Member
2015 27' FB International
Howard
, Ohio
Join Date: Dec 2014
Posts: 267
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Colorado high country, what altitude? Furnace output will be reduced at altitude maybe as much as 4% per 1000ft. If the furnace works fine at low altitude that may be your issue. See if your manual mentions anything about rating and altitude.
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09-24-2016, 06:36 PM
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#6
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Rivet Master
1995 25' Excella
xxxxx
, xxxxxx
Join Date: Apr 2015
Posts: 2,349
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Are you sure the furnace actually lit? Was the exhaust hot?...Running continuous all night would use a lot of propane.
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09-25-2016, 02:54 PM
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#7
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4 Rivet Member
1973 31' Sovereign
Middletown
, California
Join Date: Oct 2013
Posts: 424
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Is the exhaust gas hot when it comes outside? If so might have a duct leak that is dumping your heat somewhere. If the exhaust vent is not hot you have a restriction in the gas supply or low pressure, maybe a dead bug in the gas jet or a mud dauber egg sack in a gas line. Can you watch the flame at the burner through an inspection port? The furnace should cycle on/off at those temperatures. Something not right.
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09-25-2016, 07:50 PM
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#8
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3 Rivet Member
2012 25' FB Flying Cloud
Parker
, Colorado
Join Date: Aug 2015
Posts: 131
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I was having the issue at 10,200 ft so altitude may be part of the problem. Vent outside was hot, just not as hot as usual. I also have a propane line at the tank that is kinked pretty hard as the space between the guage and the cover is tight.
I'll replace this, and fire it up again now that I'm home at 6,000 ft and report back. Thanks for all the suggestions.
__________________
2012 25FB with solar
2012 Toyota Tundra 5.7L V8
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09-25-2016, 09:44 PM
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#9
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Rivet Master
2012 23' FB International
Woodstock
, Ontario
Join Date: Aug 2014
Posts: 1,423
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It is a fairly new trailer so the gas jet is not likely at fault, but that is a common issue.
If all of the above suggestions.don't work try cleaning the jet
JCW
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09-26-2016, 06:38 AM
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#10
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Site Team
2007 30' Classic S/O
Somewhere
, South Carolina
Join Date: Apr 2010
Posts: 6,436
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Debris clogging the orifice? Never fires. Igniter not sparking?
__________________
S/OS #001 2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Dexter 4 Piston Disc Brakes, Carslile Actuator, Equal-I-Zer, Dill TPMS. Campfire cook. BMV-712. DEMCO 21K Lb Cast Iron coupler
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09-26-2016, 07:44 AM
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#11
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Rivet Master
2014 27' FB Eddie Bauer
Chelsea
, Michigan
Join Date: May 2010
Posts: 1,792
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If the furnace was running all night then it's unlikely that there is a problem with gas getting to the point of ignition as the furnace has some "fail safes" to prevent it from running if there is no flame. My money is on a leak somewhere in the hot air supply. It's possible that one of the ducts slipped off a coupling somewhere in the system and the hot air is simply being distributed in a manner other than as designed (perhaps it's all going into the belly pan?) Start at the furnace and follow the ducts as far as you can to see if there is a leak.
__________________
Bob Martel
WBCCI# 5766
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09-26-2016, 05:21 PM
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#12
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3 Rivet Member
2012 25' FB Flying Cloud
Parker
, Colorado
Join Date: Aug 2015
Posts: 131
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I had installed adjustable vents recently. When I fired it up today at 6000 ft. it's running much hotter and the vent under the dinette was completely closed. I was checking the bedroom one before. I opened it, and now the flow throughout the trailer is back to normal. Nothing in the vent tube, and the outside vent air is scorching. My thoughts are:
1. The altitude reduced efficiency.
2. With the main dinette vent closed (which is closest to the furnace), the majority of the heat wasn't flowing and was keeping it from distributing to the rest of the trailer properly.
I'll be at 8,000 ft the weekend for one last trip of the season, let's see what happens then......
__________________
2012 25FB with solar
2012 Toyota Tundra 5.7L V8
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09-27-2016, 02:08 AM
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#13
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4 Rivet Member
1973 31' Sovereign
Middletown
, California
Join Date: Oct 2013
Posts: 424
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With a vent closed the firebox could have been overheating and cycling the burner off and on by an over temperature switch. Fan running all the time but average heat output way down.
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