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Furnace completes cycle but the (24volts)wont keep the gas valve on.

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Depending on which model you have there is a fan limit switch or a fan control or pc board that will bring the fan on once the furnace warms up some so that it doesn't blow cool air. This could be malfunctioning or the blower it;s self is malfunctioning which could be a fan relay, compasitor, or the blower motor it's self.

Posted on Sep 29, 2008

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