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    Sylvann's Avatar
    Sylvann Posts: 1, Reputation: 1
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    #1

    Dec 17, 2010, 05:42 PM
    Furnace blowing cold air
    My furnace keeps blowing cold air and will not heat up the house. I changed the filter and it ignites and flames go on but do not stay on long before they shut off.
    Covertaire's Avatar
    Covertaire Posts: 13, Reputation: 2
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    #2

    Dec 17, 2010, 06:58 PM
    Check and see if your furnace has a flame sensor. It may be corroded or failed.
    Dennis1523's Avatar
    Dennis1523 Posts: 54, Reputation: 2
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    #3

    Dec 17, 2010, 08:01 PM
    Yes it is the flame sensor/milivolt generator or your fan motor is not kicking on in time before the limit switch says fk it cut the gas off. In that case you need a fan motor of a cooler cut in time on your cam stat/fan limit switch. You can always turn the fan to on at the stat to isolate the problem. If it don't come on it is the fan motor.

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