smell from gas furnace

Old 03-30-09, 12:33 PM
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smell from gas furnace

I have a Carrier gas furnace -forced air. At various times (no pattern) we get a burning smell without the furnace actually runnning. It seems to oocur when the thermostat calls for heat, the ignitor starts to glow and the small fan for the exhaust kicks in. The smell starts and the furnace buners do not kick in. A couple of minutes later the the furnace re-cycles and everything is ok. The smell is hard to describe, maybe burning electrical insulator?, not sure.
The furnace was checked over twice by my service company. Any ideas?
Old 03-30-09, 01:08 PM
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Hard to say. Possibly a circuit board or ignition module that is overheating and getting primed to fail. If practical, I'd take any cover off the circuit board and look for evidence that some part of it is being scorched.

Transformers are another thing that could stink if they overheat. You could do a sniff test or cautiously put a hand on the transformer to see if it's getting hot during one of those episodes.

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