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Old 10-06-2006, 02:03 PM   #1
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1972 27' Overlander
Torrance , California
Join Date: Apr 2006
Posts: 3
Furnace Problem

In my 1972 Overlander with a Suburban NT30 furnace, when I light the pilot light, simultaneously the burner lights as well, on a very low flame. I suspect that the gas valve is stuck open or leaks and fills the combustion chamber and is then ignited by the pilot lighter. However, when the ignitor port cover is replaced, the flame is extinguished in a minute, no oxygen I think. If the cover is left open, it continues to burn. When the thermostat is raised, the fan turns on and the burner comes on full force as long as the lighter port cover is open throwing a blue flame from the cover( quite exciting!). With the lighter port cover closed the burner and pilot are extinguished when the fan comes on. Once again, seems to point to no oxygen. Any wisdom from the experts on the forum would be appreciated. Thanks
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Old 10-06-2006, 11:34 PM   #2
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1963 16' Bambi
1962 22' Safari
Yreka , California
Join Date: Mar 2006
Posts: 1,937
First thing we would do... turn off the propane and clean out all the lines. Could be a dead bug or dirt stuck somewhere fouling things up. After you are certain the lines are clean, then check the fittings. Turn fuel back on and use the soapy water routine on the fittings to be sure there aren't any weird leaks. If all that passes, then it is time to check the various parts of the unit for rusted through parts? Or something that needs replacement.

After that... I run out of suggestions. See what others recommend! Good luck!

Mrs. NorCal Bambi (traveling in S Tardis)
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Old 10-07-2006, 07:49 PM   #3
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sounds like the gas valve is leaking by.
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