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    ungen94's Avatar
    ungen94 Posts: 1, Reputation: 1
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    #1

    Oct 12, 2007, 02:49 PM
    Furnace Fan
    What problem could cause a fan to run on the furnace if switched to on, but won't kick on if set to auto
    MOWERMAN2468's Avatar
    MOWERMAN2468 Posts: 3,214, Reputation: 243
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    #2

    Oct 12, 2007, 04:21 PM
    Will the fan come on on the manual position? If so it is the thermostat that is defective.
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
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    #3

    Oct 12, 2007, 04:46 PM
    May be thermostat, fan /limit switch, fan relay or motor.
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