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    elaine12's Avatar
    elaine12 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 29, 2006, 01:19 PM
    Heating unit won't turn on in AUTO setting
    My upstairs heat will not turn on in the AUTO setting . I hear the click on the thermostat for it to turn on but the fan will not blow. I can turn it on to "FAN ON" and it will blow but when I change it back to "AUTO" the fan shuts off and won't come on.
    Any ideas?
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
    Uber Member
    		  
    #2

    Dec 30, 2006, 11:53 AM
    Fan on and heating use different windings in the motor and a different relay to control it. Likely the relay on the control board is bad. You might do some checking, but likely you will have to replace the board.
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