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Old 11-17-2019, 10:23 AM   #1
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2016 27' Flying Cloud
Woodinville , Washington
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Propane Heater Won't Stay Lit

AS = 2016 FC 27 FB

After the AS has sat for several weeks, I turn on the propane tanks.
I light the propane stove to ensure that I do have propane then turn the stove off.
I turn on the propane furnace and then go outside and stand by the furnace exhaust.
Approx. five seconds later, the furnace fan comes on.
Approx. ten seconds later, the propane lights, as I now hear a rush of exhaust and feel heat in the exhaust.
That lasts approx. ten seconds and then stops (although the fan continues).
Approx. ten seconds later, that cycle repeats.
Approx. ten seconds later, the fan shuts off.
If I go back inside the AS, turn the heater/heat pump control off for approx. ten seconds, then turn the furnace on again, the whole cycle repeats.

The problem is that the propane burning won't stay on after apparently being lit and after several on & off cycles of propane burning, the heater shuts down.

Any ideas re how to keep the propane furnace on?

Richard Wills
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Old 11-17-2019, 10:40 AM   #2
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I do not know how to trouble shoot the furnace. When we had a problem I called a mobile RV service. They came and pulled the furnace and worked on it in their truck that had 12 volt and propane connections. They also worked on the regulator and the gas supply line. They fixed it well. Yours may be a thermocouple, a loose connection, or a bad board. There is a thermocouple that has to be hot to keep the gas flowing. The Suburban furnace is common in the RV industry.
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Old 11-17-2019, 11:18 AM   #3
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My guess, based on your description:
There is an obstruction (cocoon, wasp nest, or spider web).

Anything that obstructs airflow (combustion intake/exhaust or internal air circulation) can cause the furnace to overheat, which activates an internal high temperature sensor, which causes the gas valve to close.

example>
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Old 11-17-2019, 11:28 AM   #4
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I have the same symptoms, but only on rainy days. I had the service department take a look at it a couple of months ago when I was having other work done in JC. They cleaned out a bunch of dirt and stuff, but could not make it fail (dry day). The unit continues to fail on rainy days. Living in Arizona, rainy days are the exception.

My thinking is that either the circuit card is failing or the flame sensor is failing. I have both parts now and will proceed next time it rains...
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Old 11-18-2019, 10:35 AM   #5
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mud dauber in chimney

You could have a mud dauber nest in the furnace chimney. This is easy to repair - and to remedy using a Camco screen.
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Old 11-18-2019, 11:09 AM   #6
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Carlisle , Pennsylvania
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Hi

You could have "stuff" anywhere from the air intake clear through to the top of the chimney.

You could have dirt in the burner it's self.

You could have a bum regulator ( look at the flame).

You might still have air in the line (try try again ...).

You could have a broken thermocouple / loose thermocouple lead.

You could have a broke control board.

First step (as noted above) is to clean everything out. Check the obvious stuff. Past that start playing with swapping out parts.

Bob
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Old 11-18-2019, 11:15 AM   #7
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Does the water heater run on propane correctly?

If WH runs ok then turn on stove top burners at same time If propane system supplies those propane thirst appliances then that’s good sign for propane system.

What is the brand of furnace?
Any fault code lights on control board?
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Old 11-18-2019, 11:16 AM   #8
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1981 31' Excella II
New Market , Alabama
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I just cleaned out my Atwood Furnace and it was a mess. There were dirt dauber nests on the burner, the burner was full of lady bugs and the jet nozzle was full of no-see-ums and it was almost clogged. It would run but put almost no heat. It runs great now and does not smell like burnt lady bugs. I also had to replace the main gas regulator at the tanks. I was only getting about 6in of water.



Perry
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Old 11-18-2019, 11:36 AM   #9
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2005 19' International CCD
Phoenix , Arizona
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We were having problems with no heat being generated but the fan would blow cold air. There is a reset button inside the furnace area. We did that and it now works. Good luck.
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Old 11-18-2019, 06:29 PM   #10
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2018 25' Flying Cloud
jupiter , Florida
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Propane Furnace issues

Quote:
Originally Posted by Rgentum View Post
AS = 2016 FC 27 FB

After the AS has sat for several weeks, I turn on the propane tanks.
I light the propane stove to ensure that I do have propane then turn the stove off.
I turn on the propane furnace and then go outside and stand by the furnace exhaust.
Approx. five seconds later, the furnace fan comes on.
Approx. ten seconds later, the propane lights, as I now hear a rush of exhaust and feel heat in the exhaust.
That lasts approx. ten seconds and then stops (although the fan continues).
Approx. ten seconds later, that cycle repeats.
Approx. ten seconds later, the fan shuts off.
If I go back inside the AS, turn the heater/heat pump control off for approx. ten seconds, then turn the furnace on again, the whole cycle repeats.

The problem is that the propane burning won't stay on after apparently being lit and after several on & off cycles of propane burning, the heater shuts down.

Any ideas re how to keep the propane furnace on?

Richard Wills

Had same issue last summer in Michigan first time boon docking! Replaced the circuit board. Easy fix!
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Old 11-20-2019, 07:20 PM   #11
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Quote:
Originally Posted by azflycaster View Post
I have the same symptoms, but only on rainy days. I had the service department take a look at it a couple of months ago when I was having other work done in JC. They cleaned out a bunch of dirt and stuff, but could not make it fail (dry day). The unit continues to fail on rainy days. Living in Arizona, rainy days are the exception.

My thinking is that either the circuit card is failing or the flame sensor is failing. I have both parts now and will proceed next time it rains...
A very rainy day in Dewey today. Went to the Airstream and the furnace was failing just like above. Tried the easy fix first and replace the circuit board, but the symptoms did not change. Put the original board back in.

Pulled the gas valve and replaced the igniter/flame sensor and found the old one had a very loose probe. The problem is fixed and that is the good news.
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Old 12-01-2019, 11:04 AM   #12
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2005 22' Interstate
Columbus , Indiana
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Don’t over think it

I had virtually same symptoms. After replacing several components since my ohm meter told me the thermostat switch was good. It was the $30 thermostat. But ask the warden, I’ve been wrong before. Goo Luck.
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Old 12-02-2019, 11:34 AM   #13
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2015 25' Flying Cloud
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I had a similar problem and it was the “sail” sensor. Easy fix and not very expensive. I carry a spare now.
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Old 12-02-2019, 02:14 PM   #14
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Quote:
Originally Posted by Mustardt53 View Post
I had a similar problem and it was the “sail” sensor. Easy fix and not very expensive. I carry a spare now.

This is the first thing that I would look at(also known as a flame sensor), these sensors can be cleaned with some fine sandpaper or green scrubby - try that to see if it helps. If not it might be bad. Something this new you will not have a thermocouple (that is what the flame or sail sensor is for. Check your exhaust/intake (like others have said) as this would also cause something like that, short of these then you look at the main board but these tend to be expensive and in my opinion they get changed out a lot of times when there is nothing wrong with them.


John
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