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    Tomaso's Avatar
    Tomaso Posts: 5, Reputation: 1
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    #1

    Jan 17, 2009, 01:35 PM
    Igition control Unit Buzzing
    When I turn my home heating unit on, Fan on Auto, I hear the gas come on and ignite, but the fan doesn't come on. I hear a buzzing noise coming from the Ignition Control unit. If I turn the fan on, the house heats nicely, but the (Robert Shaw 180 715U) Ignition control unit keeps buzzing. Any tests or suggestions?
    Tomaso's Avatar
    Tomaso Posts: 5, Reputation: 1
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    #2

    Jan 17, 2009, 01:38 PM

    I just posted this I meant a Robert Shaw 780 715U
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #3

    Jan 17, 2009, 03:25 PM
    Brand of furnace?
    Exact model number of furnace?
    Tomaso's Avatar
    Tomaso Posts: 5, Reputation: 1
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    #4

    Jan 18, 2009, 12:34 PM
    Sears Power Miser
    Model # 867.762621
    Serial # 8331 75913
    Tomaso's Avatar
    Tomaso Posts: 5, Reputation: 1
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    #5

    Jan 18, 2009, 12:36 PM
    Maunfacturer (very faded info here) looks like SUGF 075AG02
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
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    #6

    Jan 18, 2009, 12:45 PM
    The item that is buzzing is the ignition module which has little to do with the blower itself. If you turn the fan to on and it works then the fan motor itself is good but the heating fan control device is probably defective. They can be a fan and limit on some units as in the picture below.
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