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    bigjeff777's Avatar
    bigjeff777 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jun 13, 2007, 09:08 AM
    Furnace Fan Motor not turning ON
    Hi,

    The fan motor connected to my furnace blower (via a belt) is no longer turning ON reliably.

    I can hear the call for the motor to turn ON, but the mottor just "humms" then turns OFF.
    Then the cycle repeats itself.

    If I manually push the motor pulley during the "humm" then the motor runs fine.
    Again, the motor does not seem to be able to START by itself.

    I usually keep the fan switch on the thermostat set to the "AUTO" position.
    Not sure if it is relevant but note however, that the fan no longer turns ON if I select the "Manual" position (but maybe it is just humming and I can't hear it).

    Any suggestion as to what the cause may be?

    Thanks.

    Jeff Hall
    esquire1's Avatar
    esquire1 Posts: 2,483, Reputation: 209
    Ultra Member
    		  
    #2

    Jun 13, 2007, 10:02 AM
    First check The capacitor. If you can start the fan with a push, your capacitor has failed
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
    Ultra Member
    		  
    #3

    Jun 14, 2007, 01:55 PM
    Most belt drives are not capacitor run motors, it sounds like the motor is going bad.
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
    Ultra Member
    		  
    #4

    Jun 14, 2007, 08:48 PM
    I agree, Sounds like it's time to replace the motor...
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