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  1. #1
    Join Date
    May 2008
    Location
    Ontario
    Posts
    34

    Default furnace motor buzz

    Tempstar High Efficiency furnace had a hum/buzz typical of a motor trying to start: With the panel removed, and depressing the cut-out switch the fan motor (or something on the electronic panel attached to it) made this sound. The thermostat was set to OFF (set to engage neither furnace nor A/C), and the fan setting on the thermostat at Auto. I didn't think the fan would be trying to start under this scenario.

    When I changed the fan setting at thermostat to ON the fan would spin - after a brief delay (3-4 seconds) but with the same noise.

    The house is vacant, gas turned off, and only the AC has been used in the last several months.

    The fan is dirty - lots of vibration when it did run (7 years old).

    The prospective buyer is having a tech in tomorrow, but in the meantime, I'm curious. Any ideas?

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  2. #2
    Join Date
    Mar 2007
    Location
    Plano, Texas
    Posts
    4,170

    Default Re: furnace motor buzz

    Sounds like a transformer, not the motor.

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  3. #3
    Join Date
    Mar 2007
    Location
    New Mexico
    Posts
    1,258

    Default Re: furnace motor buzz

    Transformer. I just minimized the buzzing on my rental property furnace, and it was doing exactly the same thing. I loosened the screws a little bit and isolated the transformer from the metal bracket with a piece of paper. I can still hear it, but it's much quieter.

    Jim Robinson
    New Mexico, USA

  4. #4
    Join Date
    Oct 2003
    Location
    Rockwall Texas
    Posts
    4,519

    Default Re: furnace motor buzz

    Furnace motor buzz?

    Good Lord, these kids will try anything nowadays for that buzz.

    We used to slam a few beers for a buzz, but I get thats not exciting anymore.


  5. #5
    Join Date
    Aug 2008
    Location
    Pleasant Hill, Iowa
    Posts
    140

    Default Re: furnace motor buzz

    Jim & Jim are correct, it has a 40 VA transformer making the noise. They do this all the time. It's in the way it is mounted. I have seen people hang them so they don't touch anything. Poor way of doing it. All transformers buzz.

    Dan


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