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

    Oct 14, 2009, 08:30 AM
    FWA blower motor
    I just turned on my furnace for fall season - the fan/blower does not come on in the auto position but does work properly in the on position - question is , is this a sensor, motor or thermostat issue? Thank You
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 14, 2009, 09:55 AM
    Depends upon the unit but there is a item called a fan control or relay that controls the blower in the heat mode. When you switch the thermostat to the ON position instead of auto you are using the A/C relay instead of the fan heat control.

    On older units they look like this.
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