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    jbox1973's Avatar
    jbox1973 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jun 23, 2009, 07:54 PM
    Blower works on heat butnot a/c
    On my central unit the heat works fine but turn on the a/c the blower motor won't come on. I replaced the relay.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Jun 24, 2009, 03:41 AM
    It could be the

    Thermostat
    Thermostat low voltage wiring
    Defective circuit board if one is used in the system

    These three will be a good start.
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