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    Hershey107's Avatar
    Hershey107 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 26, 2008, 09:06 PM
    Honeywell CT47A 4447 Thermostat Fan
    Hello,

    My question is about my thermostat. The thermostat works fine. The furnace cycles normal... It calls for heat when it should and the blower motor operates when asked. Only thing I have a problem is... While everything is good with the fan on "Auto".. When I switch it to "Manual On".. to circulate the air in the home while furnace is off.. the blower does not come on. Any help would be appreciated. There is obviously power to the motor since it does operate on "Auto" but not on Manual. Maybe Tstat?

    Thanks!

    :)
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 26, 2008, 09:22 PM
    The green wire controls the blower in the on mode. There is also usually a relay that turns the blower on in the on mode. It is probably the relay but check to be sure you have 24 volts on the green wire to common in the furnace.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #3

    Oct 27, 2008, 06:13 AM

    In HEAT mode, the furnace controls the fan, not the tstat.
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