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My Rheem Corsaire furnace is short-cycling. It ignites, the burners stay lit the fans run for a while then the burner shuts off, the fans run until the cooling oft temp is reached then shut off. Right away the furnace starts right back up. It does this until it reaches the temp the thermostat is calling for. I had a problem with the flame sensor last year, but then the burner would light and then go right out.

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Try blowing air thru the pilot tube. You may have a spider web in the burner tube.

Posted on Oct 15, 2010

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