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I have a sears forced-air furnace that automatically lights. It will go on when I first turn up the thermostat. It burns and produces heat for about 10 to 15 minutes. Then the burner goes out and it starts blowing cold air. At that point it goes into an endless cycle of the igniter firing, no gas being supplied to the burner, and then igniter firing again. I have changed the filters... Larry

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You probably have a bad Thermo-couple . It is a copper looking rod that sets in the flame of the pilot lite It also has a copper wire that goes to the main valve and connects with a 1/4-3/8 nut or a metal clip. The purpose of this part is to tell the computer that the flame is lit and all is good, but it fails often with the same symptoms.
Be very carefull not to touch the white ceramic igniter, for it will fall apart and that will cost you 40.00 bucks to replace. The last time I replaced my thermo coupler on my furnace, it cost 9-10 bucks and most hardware or heating supply will have it.
. But remember use the proper tools, don't just grab any old pliers, look very carefully and u will be ok.
good luck, mule460

Posted on Oct 17, 2008

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