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  1. #1

    New Rheem mod furnace whines

    It's about 6 weeks old. What a beauty! House has never been so uniformly comfortable. And so quiet! Except for one thing -- it makes a whining tone in the middle speeds. Isn't there at high power when coming out of night set back. Isn't there at the lowest 3 or 4 speeds. Just in the middle where it spends most of its time.

    Any idea what could be causing it and how to fix? If I run just the fan, that is right in the sweet spot for the whining noise.

    For what it's worth, the whine used to be at the slowest speeds until the electronic air cleaner was replaced by a pleated passive unit. I'm guessing air flow must have something to do with this noise.

    Thank you!

  2. #2
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,784
    What did your contractor say was causing the noise.
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    How many times must one fix something before it is fixed?

  3. #3
    I asked him about that. He heard it also, but it didn't sound that strong to him. He said let it run a few weeks and see what I think since a new furnace will make new noises. True. Call him back if need be.

    I think it need be.

  4. #4
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,784
    Yea, its hard to diagnose noises onver the internet.

    He may need to call Rheem tech support, if he can't determine what is causing the noise.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    Jan 2005
    Location
    Emerald Coast
    Posts
    965
    Was there a shipping bracket on the blower wheel?
    Do not attempt vast projects with
    half vast experience and ideas.
    ...

  6. #6
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,607
    Good point sleuth, that caught us up one time

  7. #7
    Join Date
    Jan 2005
    Location
    Emerald Coast
    Posts
    965
    Don't even aske me why I thought of that ...


    Do not attempt vast projects with
    half vast experience and ideas.
    ...

  8. #8
    Shipping bracket on blower wheel...

    I'll have to check on that. But it will take me a day or so before I can.

    Thanks.

  9. #9
    Join Date
    Jan 2005
    Location
    Emerald Coast
    Posts
    965
    1) shipping bracket

    2) blower housing has occasionally been the culprit / source of harmonics
    & noise.
    Do not attempt vast projects with
    half vast experience and ideas.
    ...

  10. #10
    Join Date
    Jul 2003
    Location
    Rochester NY
    Posts
    160
    Do you have a return air base the new furnace sits on?

  11. #11
    Finally back!

    So I removed the lower cover and looked for any possible shipping brackets on the blower/wheel. I couldn't see any. Of course, I don't really know where to look or what to look for!

    I did find and remove a few bits of left over wire insulation and grommet laying on the bottom. Had no effect on the whining tone.

    It is a up flow model, but the flow is actually from the side, so the original metal bottom plate remains screwed in place.

    I can very reliably make the tone occur by setting the blower to ON, which is set for 800 cfm.

    Anything else I should look for?

    I have another question, but on a different subject so will make a separate post.

    Thank you.

  12. #12
    Join Date
    Nov 2008
    Location
    Chapel Hill, NC
    Posts
    1,070
    I have the same issue with mine. It's more of a howl/hum than a whine and it's coming from the return air grill at medium speeds (not low or high). Pulling the grill cover out and just leaving the filter in gets rid of it. Putting my hand on the grill cover reduces it so I guess it's some sympathetic vibration (resonance) in the grill slats.

    Might want to look at this.

    Keith

  13. #13
    sktn77a -- My noise definitely comes from the furnace, not the grill. I've even used my nurse-wife's stethescope to localize it!

    But I did have that vibrating grill problem immediately after installation. My contractor fixed it by enlarging the opening and installing a new, stiff grill plate. Fixed it.

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