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    ttown78's Avatar
    ttown78 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 31, 2007, 06:13 PM
    Central heat blower
    We have a Trane unit, the furnace is in the attic. My husband had it set to ON to keep the fan running. I switched the setting to Auto so the program would take over. The furnace will click on but the fan will not run. What could it be?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Dec 31, 2007, 10:09 PM
    Defective blower control.
    Did you just replace the thermostat?
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
    Ultra Member
    		  
    #3

    Jan 1, 2008, 09:15 AM
    The furnace will run on high speed when in the "on" position on the thermostat , when fan is in the "AUTO" position the furnace will run in low speed operation, the low speed portion of the motor may be bad or the fan- limit switch may faulty or the normally closed contacts in the fan relay may not be making contact. Hope this helps, Mike
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