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    trazmo's Avatar
    trazmo Posts: 6, Reputation: 1
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    #1

    Dec 31, 2009, 11:14 AM
    Furnace blower motor
    My furnace blower motor will run properly on "Auto" but will not operate at all on "On".
    What's going on?

    Thanks,
    trazmo
    trazmo's Avatar
    trazmo Posts: 6, Reputation: 1
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    #2

    Dec 31, 2009, 11:16 AM

    I forgot to mention, I have replaced the thermostat (Honeywell electronic).

    Trazmo
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #3

    Dec 31, 2009, 12:02 PM
    Time for you to revist your thermostat install. The G terminal is what controls the manual operstion of the blower. If not the wiring then check the thermostat setup program to be sure all your settings are correct.
    trazmo's Avatar
    trazmo Posts: 6, Reputation: 1
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    #4

    Dec 31, 2009, 12:31 PM

    Thanks for the input. Done what you suggest, all is correct. I was having the problem before the new thermo, that's what prompted me to install it.
    Any other thoughts?
    Thanks,
    Traz
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #5

    Dec 31, 2009, 12:53 PM
    If it is working correctly at this point the job is done since I am sure you caulked or plugged the area where the thermostat wire comes through the wall on the back side of the thermostat. This prevents inner wall drafts from creating problems with the thermostat temperature sensing device.
    parttime's Avatar
    parttime Posts: 1,440, Reputation: 113
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    #6

    Dec 31, 2009, 01:27 PM

    What type of furnace? Model?
    trazmo's Avatar
    trazmo Posts: 6, Reputation: 1
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    #7

    Dec 31, 2009, 02:53 PM

    Comfortmaker
    GUH100A016CIN
    parttime's Avatar
    parttime Posts: 1,440, Reputation: 113
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    #8

    Jan 1, 2010, 08:04 AM

    trazmo, are you sure of the model #? Can't seem to find anything using that number. I think HVAC1000 (he's the expert) thinks your problem is solved, you might need to repost. Good luck
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #9

    Jan 1, 2010, 08:43 AM
    I just picked back up on this. I misread the post and thought the problem was over. Usually the furnace blowers ON thermostat selection is controlled by a relay. On newer furnaces this relay is located on the circuit board but older units have a stand alone relay. I have located your furnace BUT I have no wiring diagram for it. Does you furnace have a circuit board?
    trazmo's Avatar
    trazmo Posts: 6, Reputation: 1
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    #10

    Jan 1, 2010, 08:54 PM

    Yes, it has a circuit board
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #11

    Jan 2, 2010, 06:42 AM
    Usually the circuit board contains the blower relay. See if there is 24 volts from the thermostat green wire to ground. This is at the G terminal in the unit. The G terminal is what activates the blower when using the ON selection at the thermostat.
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    trazmo Posts: 6, Reputation: 1
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    #12

    Jan 3, 2010, 08:32 PM

    I checked out the board and a lead was burnt out. I reapaired it an now motor run normally in both the "on" and "auto" positions. Thanks for the suggestions they led me in the right direction.
    Over and out,
    trazmo
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #13

    Jan 3, 2010, 08:47 PM
    Glad you got it running.
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