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Older coleman furnace in mobile home model 8631a was called by older couple who own it. Was told that standing pilot has gone out twice within two weeks never had problem before. Questioned owner if problem only seem to happen when trying to operate answer was yes (obviously) what could cause this ?

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There is a coulpe of reasons that the pilot would go out.
1. Thermocouple is dirty, try cleaning it.
2. Thermocouple is no in the pilot flame. Look and make sure it is directly in flame.
3. Pilot dirty. Flame has to be blue not yellow.
4. At the gas valve the thermocouple comes to it. use a wrench, usally 5/16ths, or 3/8s in. and make sure thermocouple is tight going into gas valve.
5. WORST case is that the heat exchange is cracked and blower motor is blowing it out. Hope this helps. thank you.

Posted on May 18, 2011

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