1974 trillium - Fiberglass RV


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Old 07-18-2018, 10:46 AM   #1
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Name: Mel
Trailer: 1974 trillium
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1974 trillium

My duo therm 65211-2 glen aire gravity sealed combustion wall furnace, the pilot will light for10-12 seconds, then I get a flashback and the pilot shuts off. I took the outside vent cover off and cleaned out some wasp nest and I donít think there are any more obstructions. Any help would be appreciated. Thanks Mel.
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Old 07-18-2018, 11:16 AM   #2
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Name: Dave W
Trailer: Trillium 4500 - 1977, 1978 (2), 1300 - 1977, 1973, and a 1972
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Not sure what you mean by a flashback.
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Old 07-18-2018, 11:33 AM   #3
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Trailer: 1974 trillium
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Hello David and thank you for replying. When I try lighting the pilot and still holding the red pilot button in, it will stay lite for 10/12 seconds while holding in the red button and then a flame shoots out the pilot hole in front of the furnace and shuts off?
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Old 07-18-2018, 01:47 PM   #4
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I could be wrong, but it sounds like the furnace is trying to light the main burner, but does not have enough air. You may need to remove the whole furnace and clean the air intake that runs down the back of the furnace.

At this point it should be noted that the odds of successfully removing the furnace are probably less then 50/50. The outside vent is installed from the outside. There are two concentric ducts. On the inside is the exhaust tube. Surrounding that is the combustion air intake. These are supposed to telescope so that if you remove the rivets on the outside, the whole exterior vent slides out in two pieces. The trouble is that the exhaust vent get very hot, and this causes it to rust. Typically fusing the two pieces together. The outside combustion air duct will likely still slide, but since the inside exhaust part will not fit through it, (without doing some damage) the combustion air duct is stuck as well.

Some have had luck using PB Blaster and letting it soak in for some time. I currently have all of mine soaking:
PB Blaster Penetrant | Canadian Tire

You can down load the manuals for your furnace in the document center:
http://www.fiberglassrv.com/forums/d...20furnaces.pdf
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