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-   -   Igition control Unit Buzzing (https://www.askmehelpdesk.com/showthread.php?t=304904)

  • Jan 17, 2009, 01:35 PM
    Tomaso
    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?
  • Jan 17, 2009, 01:38 PM
    Tomaso

    I just posted this I meant a Robert Shaw 780 715U
  • Jan 17, 2009, 03:25 PM
    hvac1000
    Brand of furnace?
    Exact model number of furnace?
  • Jan 18, 2009, 12:34 PM
    Tomaso
    Sears Power Miser
    Model # 867.762621
    Serial # 8331 75913
  • Jan 18, 2009, 12:36 PM
    Tomaso
    Maunfacturer (very faded info here) looks like SUGF 075AG02
  • Jan 18, 2009, 12:45 PM
    hvac1000
    2 Attachment(s)
    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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