Gas Furnace startup Noise (Video)

Discussion in 'HVAC Heating & Cooling' started by Mlang2000, Jan 12, 2021.

  1. Mlang2000

    Mlang2000 New Member

    Joined:
    Apr 10, 2019
    Location:
    Midwest
    This 17 year old gas furnace has made this sound at startup for as long as I can remember. At least 10 years if not always.

    It only lasts for 2-3 seconds then runs quietly until the next startup.

    It does not make this sound in the summer when the A/C comes on. Only the winter heat.

    A friend recently heard it and said it shouldn't do that so...any thoughts?

     
  2. fitter30

    fitter30 Well-Known Member

    Joined:
    Feb 2, 2020
    Occupation:
    Retired service tech
    Location:
    Peace valley missouri
    Venter fan, b lower motor would make sound anytime
     
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  4. plumber69

    plumber69 In the Trades

    Joined:
    Jun 20, 2014
    Location:
    Prince Rupert, British Columbia
    Definitely sounds like inducer. Loose bearings. Id leave it till if fails
     
  5. DavidDeBord

    DavidDeBord Member

    Joined:
    Aug 9, 2020
    Occupation:
    HVAC/Electrical/Refrigeration
    Location:
    Hamersville, Ohio
    That's a multi speed blower motor (3?,4?), & it would be rare, for the blower to be outa balance just on low/medium speed for heat, & not make any noise during the higher speed for cooling.

    So I'm guessing, based only on the video, & your comments Mlang, that it is the Induced Draft Fan, which You need to get fixed as soon as possible, for "When" it "gives up th' ghost", your furnace will go in a "Lock Out", & You will not have any heat.
     
  6. Mlang2000

    Mlang2000 New Member

    Joined:
    Apr 10, 2019
    Location:
    Midwest
    Thanks all, I have a guy coming this week.
     
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