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

    Feb 16, 2009, 09:26 PM
    Siren noise at end of furnace cycle.
    My furnace makes almost a siren sound when it shuts off, I can hear it through my return. What is this and how do I fix it?

    P.S. It also makes the big bang sound at the end of the cycle but I've read a bit about that.
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #2

    Feb 17, 2009, 04:51 AM
    What you describe sounds like an air leak of some type, or a motor that is approaching dry-seize failure. My "big bang theory" (I just couldn't resist) is duct warping.
    jdegiulio's Avatar
    jdegiulio Posts: 3, Reputation: 1
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    #3

    Feb 17, 2009, 09:06 AM
    Should I replace the motor?? Is that hard to do?
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #4

    Feb 17, 2009, 05:51 PM
    Well, confirming the source of the noise should come first. You haven't mentioned a brand/model # so I have no idea what kind of furnace you have.
    jdegiulio's Avatar
    jdegiulio Posts: 3, Reputation: 1
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    #5

    Feb 17, 2009, 08:41 PM
    It's a Rheem Criterion II Gas Furnace Model RCBA-4882GG24. The sound happens at the beginning of the cycle and at the end now. It sounds like a fan, but maybe not. I first heard it in through my return upstairs.

    Thanks.

    John
    KC13's Avatar
    KC13 Posts: 2,556, Reputation: 99
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    #6

    Feb 18, 2009, 04:30 AM
    I would observe from closer range, to pinpoint the source of the noise.
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