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Furnace troubles

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Johm

RVF Regular
Joined
Dec 13, 2020
Messages
10
Our furnace keeps going off and on. 2020 Montana fifth wheel.

We are in sub freezing weather. It lights comes on then goes out. Fan runs normal. Propane feed is good as water heater and stove top works.
 
Last edited:
We are in sub freezing weather. It lights comes on then goes out. Fan runs normal. Propane feed is good as water heater and stove top works.
 
Yikes. I would call a mobile tech and get it fixed quickly, rather than freezing while trying to figure it out.
 
Thanks but there are none in this area. Trying to bribe the local RV dealer but they are reluctant to work on a camping world product. We had a list of defaults looked at by camping world before we moved over here and none of them were fixed, have had to fix them all ourselves. We would never go or recommend them to anyone. Now the furnace in 20 degrees and a foot of snow.
 
IF you have access and are comfortable doing so try cleaning the igniter and burner. Was the furnace functioning prior to this problem?
 
IF you have access and are comfortable doing so try cleaning the igniter and burner. Was the furnace functioning prior to this problem?
Yes, it’s a Dometic. I’ve changed the sail switch. I’ve made sure the propane is good by lighting the stove top and water heater. It will come on, ignight for a few seconds then the burner will go out and the fan runs. It will oscillate like that until the room temperature is met.
 
Most likely the pilot lite sensor. Consider a Buddy heater till you can get it fixed. A pilot lite sensor is an easy fix and could be a bad connection.
 
The burner on an RV furnace has a spark ignition (no pilot flame). The burner lights with full flame and the spark rod is then used for flame rectification. In other words, when the burner first tries to light the rod throws a spark to the burner and lighting the propane, then after the gas valve opens the spark rod is used to sense flame by using the flame to conduct electricity. If the spark rod is dirty you may or may not see the anything wrong with it, but use a scrubber pad to clean it to a nice shine. When the burner does light is the flame nice and strong and mostly blue in color? If it has yellow in it the burner itself may be partially plugged (spiders are good for this) or I have seen an orifice get partially plugged. Use nothing stronger than a toothpick to poke the hole in it. Also, you can have a board fail on it and it will act like that. My water heater did pretty much the same thing. I purchased a Dinosaur Board through Amazon and fixed it. HERE is a site that has some good troubleshooting instructions.
 
Guess either they froze to death or got buried by the snow or forgot about us..........
 

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