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    billrratledge's Avatar
    billrratledge Posts: 2, Reputation: 1
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    #1

    Apr 19, 2009, 03:13 PM
    Furnace works well but fan only w/manual on/not auto
    I have furnace/AC made by Comfortmaker, model RPJ II with a White Rogers Digital Comfort Set II thermostat.

    Furnace comes on, but not fan when on auto. When I turn fan on manually using thermostat all is well.

    Is this a thermostat problem or fan control on furnace and can I fix?
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Apr 19, 2009, 04:33 PM

    Most likely a fan control problem. The t-stat should not control the fan in the heat position.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #3

    Apr 19, 2009, 04:49 PM
    I agree with joshdta. The furnace turns the blower on in heating mode. The thermostat in cooling mode. Sound like you have a control board that's gone bad.(time delay on the blower heat relay is bad.)
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