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    sgdos's Avatar
    sgdos Posts: 3, Reputation: 1
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    #1

    Aug 16, 2007, 09:04 AM
    A/C blower not coming on
    I have verified that the thermostat is working, but cannot get the a/c to turn on. The outdoor unit appears to be OK, and the cooling lines into the house are cold, I can hear the electrical system "humming" but the blower will not turn on. I turned the system to heat and the blower DID kick on, but the system did not ignite. Any help would be appreciated"
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
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    #2

    Aug 16, 2007, 09:08 AM
    The indoor blower is not working? Did you put it to fan "on" at the thermostat ? You may have a bad fan relay , fan motor or possibly a fan motor capacitor.
    sgdos's Avatar
    sgdos Posts: 3, Reputation: 1
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    #3

    Aug 16, 2007, 09:11 AM
    Fan "on" at the thermostat did not get it to kick in. But when I went to the heat cycle, it did...
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #4

    Aug 16, 2007, 09:22 AM
    The heat uses a different relay and motor winding than A/C and fan on. It could be the relay. That would be a simple fix, if it wasn't part of the control circuit board.
    sgdos's Avatar
    sgdos Posts: 3, Reputation: 1
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    #5

    Aug 16, 2007, 09:24 AM
    How do I determine if it is relay and/or part of the control circuit board? This is a Lennox unit (about 4-5 years old)
    acetc's Avatar
    acetc Posts: 1,004, Reputation: 79
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    #6

    Aug 16, 2007, 09:35 AM
    Look in the furnace , if it has a printed circuit board then it will not have a separate relay, put a wire jumper between the green and red thermostat wires in the furnace and the fan should work, if no fan then you would have to check with a volt meter to the motor windings to see if the board is asking the motor to run.
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