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Old 09-24-2016, 04:29 PM   #1
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2012 25' FB Flying Cloud
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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.
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Old 09-24-2016, 04:55 PM   #2
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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.
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Old 09-24-2016, 05:35 PM   #3
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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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Old 09-24-2016, 06:08 PM   #4
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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.
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Old 09-24-2016, 06:28 PM   #5
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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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Old 09-24-2016, 06:36 PM   #6
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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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Old 09-25-2016, 02:54 PM   #7
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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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Old 09-25-2016, 07:50 PM   #8
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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.
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Old 09-25-2016, 09:44 PM   #9
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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
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Old 09-26-2016, 06:38 AM   #10
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Debris clogging the orifice? Never fires. Igniter not sparking?
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Old 09-26-2016, 07:44 AM   #11
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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.
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Old 09-26-2016, 05:21 PM   #12
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2012 25' FB Flying Cloud
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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......
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Old 09-27-2016, 02:08 AM   #13
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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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