Furnace ignites a few seconds then quits

[ATSL77]

Just to let you know what was wrong was that the unit was just dirty. I'd attribute most of it to a ton of soot in the chamber. I cetainly appreciate everyones advice and input. Thanks again.

[david686]

It does sound like the sail switch. The formed owner even had the control board replaced because of the problem. I pulled out the sail switch, tested it and saw that it worked only sometimes, replaced it and the heater works every time now.

[steveturk]

I had this exact same problem with the Suburban furnace in my 1978 Argosy motorhome last year. It turned out to be the Limit Switch. I replaced it along with the gasket and it took care of the problem.

[Mike Leary]

Originally Posted by david686

It does sound like the sail switch. The formed owner even had the control board replaced because of the problem. I pulled out the sail switch, tested it and saw that it worked only sometimes, replaced it and the heater works every time now.

The sail switch is the last thing I'd check, in my twenty years and four Air Streams, I've never had one go out, but we've full-timed and the furnace gets regular use. Everything else have failed, in spades. It's almost better, especially on older furnaces, when it's removed and cleaned, to replace everything that could cause the same problem: air, but no heat.