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Old 06-07-2011, 09:07 AM
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Default Furnace

Anybody on here worked on their forced air furnace in their RV? I have an older trailer with a suburban furnace, and the furnace stopped working last weekend. I know there is two limit switches and a sail switch inside, but I'm wondering if I have to take the whole unit out to get to them or if I can just pull the guts out somehow? I'm going to test the thermostat this weekend when I get a chance, but thinking beyond the thermostat.
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Old 06-07-2011, 09:30 AM
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I know in my '87 Tioga Class-C, I have the same furnace, sounds like.

Sometimes I found the contacts in the therm-stat get a little oxidized, and won't trigger the furnace.
A little strip of brown paper grocery bag dragged between the points is abrasive enough to solve that problem. (Old electronic tech trick. )

But another time about 10 years ago the circuit board failed, and the high voltage sparker ignitor wouldn't work. Ended up replacing the board.

Hope that helps some.
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Old 06-07-2011, 02:05 PM
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would the fan still spin in there when your ignitor wouldn't work?
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Old 06-07-2011, 03:04 PM
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Quote:
Originally Posted by woodzy View Post
would the fan still spin in there when your ignitor wouldn't work?
Yes , when Therm'stat calls for heat, blower fan starts and runs about 30 seconds as a purge cycle, and to "prove" unblocked intake and exhaust.
Sail switch does this.

Then you hear the gas valve "click" on , then the ignitor is supposed to light the flame.

Mine would get thru to the gas valve "click" then nothing........ then it would shut down.
On my furnace, usually I can hear the "snap-snap-snap" of the ignitor spark, when working normally.

I yanked the whole furnace out , about the size of a microwave oven, and took it to a reliable RV dealer. They determined the circuit board was bad. I think it cost about $100, parts & labor. But that was 10 years ago.

Maybe check simple stuff first, like disconnecting and re-connecting electrical plugs on the unit.

Just remembered my furnace has a little sight glass on it so I can see if the flame is lit or not.
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Last edited by Snowizard; 06-07-2011 at 03:06 PM.
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Old 06-07-2011, 03:11 PM
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Wiz is right on...... Circuit board are a common issue....
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Old 06-08-2011, 09:15 AM
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thanks fellas.
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Old 09-01-2011, 09:17 PM
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Get it fixed up?
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