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Old 04-28-2014, 06:01 PM   #1
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Gas furnace

My gas furnace on my 2007 Keystone Challenger wont heat up/start. I can hear the whoosh of the gas lighting...then it goes out and recycles again. The gas is on (full bottle) and all the other gas appliances work. Any suggestions?
Thanks again.
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Old 04-28-2014, 08:18 PM   #2
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Gas Furnace recycling but won't light

I had the same problem a couple of times. When the furnace starts it goes through a series of actions to be able to stay ignited. I found that using an air gun with a 12" extension on the nozzle cleaned out the fire box, gas nozzle, and sail switch of over-winter exhaust rust and soot crude that had chiped off the inside of the combustion chamber during the winter. If you have a screen over the exhaust port check that it is not plugged by the blower pushing the crude out the exhaust pipe. Blow as much of that crude out (you can only tell by the chunks that come flying out in all directions) as you can. Make sure the sail valve works by inserting the air nozzle into a hole in the blower housing and you will hear the blade fluttering by the nozzle tip as it spins. All this is done from outside by removing the furnace cover. Please wear safety glasses and be ready for a sooty/rusty/flakey shower. I do this every spring when I bring the RV out of storage. Hope this helps and good luck.
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Old 04-29-2014, 08:12 AM   #3
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Obviously it's lighting. You have an issue with the flame not getting on the sensor good, the sensor or wire bad, or a bad board. I'd clean first, always.
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Old 04-29-2014, 10:30 PM   #4
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Quote:
Originally Posted by DieselOne View Post
I had the same problem a couple of times. When the furnace starts it goes through a series of actions to be able to stay ignited. I found that using an air gun with a 12" extension on the nozzle cleaned out the fire box, gas nozzle, and sail switch of over-winter exhaust rust and soot crude that had chiped off the inside of the combustion chamber during the winter. If you have a screen over the exhaust port check that it is not plugged by the blower pushing the crude out the exhaust pipe. Blow as much of that crude out (you can only tell by the chunks that come flying out in all directions) as you can. Make sure the sail valve works by inserting the air nozzle into a hole in the blower housing and you will hear the blade fluttering by the nozzle tip as it spins. All this is done from outside by removing the furnace cover. Please wear safety glasses and be ready for a sooty/rusty/flakey shower. I do this every spring when I bring the RV out of storage. Hope this helps and good luck.
Good advice. Also look for Mud Dauber (wasp) nests.
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