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    Mdot 2483's Avatar
    Mdot 2483 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 20, 2009, 07:18 PM
    Fan won't run when in auto or on
    I have a 20 year old heil furnace and the blower won't run in auto or on mode but it will run when I straight wire the fan. The wiring diagram is not on the furnace
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jul 21, 2009, 12:05 AM
    It could be something in the low voltage signal circuit or a fan blower relay. At least you know the fan motor is good. W/O a wiring diagram you will have to trace down the defective part using a meter.
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