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Old 02-14-2010, 07:56 AM   #1
RailroadMike
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Join Date: May 2006
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Furnace Problem

I have had the rig in storage for about three months...Got it out yesterday and filled the propane bottles. I have gas going to the stove and fridge but the furnace comes on runs for a few minutes blowing cold air and shuts off. If I turn the furnace off and wait a minute or two it and then turn it on I have the same thing. So far it has not tried to start itself. Any help would be great...Got to tow it to cold northern Nevada and would like some heat....Thanks
 
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Old 02-14-2010, 08:12 AM   #2
HamRad
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Railroadmike,
Sounds like the igniter is not working properly. You obviously are getting propane and you have 12 volt power. The only thing you are not getting is an ignition of the propane. This is controlled by a board on the unit. It most likely is the igniter is broken and the board will not send a signal to the valve that lets propane flow to the furnace. It will usually try about 3 times to ignite and then shut down. If you listen closely you can often hear the clicks.

Pull the unit out and you'll see the board. Remove and take to RV parts place and see if they have a replacement. About 115 to 130 or so $$$$.

Good luck. And let us know what you find.

HamRad
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Old 02-14-2010, 06:42 PM   #3
8.1al
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If the sail switch is stuck or bad it will not ignite also but before tearing into anything I would make sure there is propane to the furnace. You could always loosen the line where it connects to the furnace
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Old 02-17-2010, 02:22 PM   #4
sreigle
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Check your battery. The furnace will not fire if the 12v control board is not receiving a minimum voltage. 10.6 rings a bell but I don't remember for sure. Even when plugged in to shore power, it requires 12v from the battery to fire. The converter feeds the battery but without a good battery the furnace will not light. I've heard and read of many with this problem and the cause was the battery. The battery could be good enough to run the fridge and stove but not the furnace.

If your battery is good, then I'd remove the thermostat from the wall and unplug it for a couple of minutes so it resets. Then plug it back in and try again. Our dealer had us try this once. Our thermostat has a single plug on the back.

If none of the above, then the next likely culprit would be the sail switch or control board but I'd check that battery first.

Good luck and please let us know what you find. Yours may be something entirely different.
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Old 02-17-2010, 04:37 PM   #5
8.1al
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Try this troubleshooting guide suggested by Ozz
http://www.rvforum.net/miscfiles/Furnace_Trouble-2.pdf
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Old 02-25-2010, 12:18 PM   #6
RailroadMike
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Hello all....Thanks for the help...turned out to be a bad board....Mike
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Old 02-25-2010, 05:08 PM   #7
HamRad
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Mike,
If you don't mind me asking about what was the price for the board? Just wondering about what various outfits are charging.

Glad you got it fixed. Did you do it yourself?

Thanks,
Dennis
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