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Old 01-31-2011, 10:28 PM   #1
3 Rivet Member
1973 31' Sovereign
Fort Worth , Texas
Join Date: Jul 2010
Posts: 102
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furnace wont run with dust cap on

I can get my furnace to run if I leave the cover for the pilot off (yes it does shoot 3" of flame out of the hole). When I cover it up it will run for a little bit but then the flame and pilot will go out. Any ideas?

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Old 02-01-2011, 04:38 AM   #2
Formally 'tiger'
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1974 Argosy 28
1978 Argosy Minuet 6.0 Metre
Wauwatosa , Wisconsin
Join Date: Oct 2010
Posts: 680
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The pilot heats a thermocouple. The heated thermocouple keeps the pilot gas flowing as well as allowing the burner gas to flow when the wall thermostat calls for it.

The first thing I would suspect is a dirty pilot. If any soot has built up, this would cause a weaker pilot flame. So when the burner flame comes on the pilot flame either goes out or becomes so weak, that the thermocouple cools down and closes the gas valve.
Use a toothbrush and clean the pilot.
If that does not solve the problem I would replace the thermocouple.
Hope this helps.

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Old 02-01-2011, 06:19 AM   #3
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1986 25' Sovereign
Plant City , Florida
Join Date: Mar 2010
Posts: 225
Could it be that the fresh air intake is blocked thus sufficating the flames?
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Old 02-01-2011, 06:41 AM   #4
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1971 27' Overlander
Currently In: Skowhegan , ME
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You might also try the pilot orifice......we had the same thing happen to ours "after" I cleaned it (the holes are tiny, and it doesn't take much to clog them up). You can replace it for $5.00, and my pilot has not gone out since.


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