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    cweeni00's Avatar
    cweeni00 Posts: 2, Reputation: 1
    New Member
     
    #1

    Jun 18, 2012, 01:30 PM
    Central Air blower not working
    I have a 5 year old Newmac CL 115 Wood/Oil combination furnace with central air connected. When I started the air conditioner this season the blower would not turn on in auto mode. The blower works fine in auto for heat, and I can force it to start with the ON function for A/C. Also, I have two thermaostats, one for Oil, one for Wood. Everything worked fine last season. Any ideas?
    Thanks in advance
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #2

    Jun 18, 2012, 04:14 PM
    Quote Originally Posted by cweeni00 View Post
    I have a 5 year old Newmac CL 115 Wood/Oil combination furnace with central air connected. When I started the air conditioner this season the blower would not turn on in auto mode. The blower works fine in auto for heat, and I can force it to start with the ON function for A/C. Also, I have two thermaostats, one for Oil, one for Wood. Everything worked fine last season. Any ideas?
    Thanks in advance
    Check/test the A/C fan relay and or the setup that is being used to activate the blower fan in the A/C mode.
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
    Ultra Member
     
    #3

    Jun 18, 2012, 09:57 PM
    The only difference between the two modes is that a fan switch mounted on the heat exchanger activates fan in heating mode and a fan relay does this in cooling mode. Trace the G from T-stat, usually the green wire where it ties at furnace. That wire will lead you to the fan relay. The coil may be bad in that relay. It should be a 24 volt coil that you can test with an ohm meter. If open, replace it for about $5.00.
    cweeni00's Avatar
    cweeni00 Posts: 2, Reputation: 1
    New Member
     
    #4

    Jun 19, 2012, 01:24 PM
    How do I check the relay with a multimeter? There is a black and a white wire leading from a copper coil. Do I check across those two wires? Do I check when the fan is off or on?
    drtom4444's Avatar
    drtom4444 Posts: 3,282, Reputation: 145
    Ultra Member
     
    #5

    Jun 19, 2012, 03:42 PM
    You got it. Those are the coil wires that go to plug-on terminals.

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