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  1. #1
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    Jan 2020
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    Replacement blower motor loud

    Need some opinions...

    The blower motor in my nearly 30 year old Rheem Criterion recently died. We had the blower motor replaced with an OEM spec motor. Now when the heat kicks on there is a annoying humming or vibration noise coming from the unit. At first, I thought it was the washing machine running on spin cycle downstairs... Called the HVAC technician back out and now they are saying that the fan and possibly housing need to be replaced.

    I don't mind having this stuff replaced if needed, but does this sound plausible? There was absolutely no sound, other than the sound of air coming out of the vents, prior to the motor dying. The technician is saying that with the unit being as old as it is, it isn't uncommon for the old fan to vibrate when a new motor is installed (new motor is spinning faster than the old one). For one, this was not stated prior to having the motor replaced. Had it been said that it is common for the fan to make noise when they installed this new motor, I would have gone ahead and replaced the fan as well to save on the labor. I also have a hard time believing this is the case... The fan is metal. Unless it was damaged when pulling the motor, I find it hard to believe that it has deteriorated over time and is now vibrating due to the new motor spinning faster than the old.

  2. #2
    Join Date
    Jul 2010
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    nebraska
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    Could be the fan bent when trying to get it off a 30 year old motor. Hopefully they checked the rest of the furnace out very well and you don't need to put a bunch of money into what's the equivalent of a car with 800,000 miles.

  3. #3
    Join Date
    Nov 2006
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    Athens, Ohio
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    It is possible that the replacement motor is not wired correctly. Another possibility is that the original motor was set for the incorrect speed but the new one IS on the correct speed.
    Did the tech measure the temperature rise to ensure the new motor is on the appropriate speed?
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


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  4. #4
    Join Date
    Aug 2002
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    Southold, NY
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    Could be any # of things. What does the contractor say?

  5. #5
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    Jan 2020
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    Thread Starter
    Thanks for the replies. Not sure if the tech measured temp rise. The tech did say that neither motor is an ECM motor so they said they could not adjust the speed up/down.

  6. #6
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    Jan 2020
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    Thread Starter
    Tech said I needed to replace the fan and housing and the noise would go away.

  7. #7
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    Aug 2002
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    Southold, NY
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    Quote Originally Posted by bcampbe7 View Post
    Tech said I needed to replace the fan and housing and the noise would go away.
    Maybe get a second opinion!

  8. #8
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    Dec 2002
    Location
    Houston,Texas
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    Some of those older Rheems/Ruuds had a 3/4 hp blower motor, even the 75,000 btu had the 3/4 hp motors. They could have had the original motor on a lower hp setting.
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  9. #9
    Join Date
    Dec 2007
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    Quote Originally Posted by bcampbe7 View Post
    Thanks for the replies. Not sure if the tech measured temp rise. The tech did say that neither motor is an ECM motor so they said they could not adjust the speed up/down.
    Hard to believe unless it is a belt drive motor. Even then things can be done.
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  10. #10
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    Quote Originally Posted by bcampbe7 View Post
    Thanks for the replies. Not sure if the tech measured temp rise. The tech did say that neither motor is an ECM motor so they said they could not adjust the speed up/down.
    Baloney! Get a better tech.
    AOP Rules: Rules For Equipment Owners.

    Free online load calculator: http://www.loadcalc.net/


    There = not here. Their = possessive pronoun. They're = they are
    It's = contraction of it is. Its = the possessive form of it
    Too = also. To = expressing motion. Two = 2
    Then = after that, next. Than = indicates a comparison.
    Questions should end with a question mark "?" Statements end with a period "."

  11. #11
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    Aug 2002
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    Quote Originally Posted by kdean1 View Post
    Baloney! Get a better tech.
    Actually he probably just need a Tech not a Parts changer!

  12. #12
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    Jan 2020
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    Thread Starter
    Thanks for all of the help and ideas thus far.

    Tech came back out today. This is the original tech that installed motor. The tech that came out on Friday was different. The tech today set fan to medium and told us to use thinner air filters. Even without a filter, the noise is still there, albeit a bit quieter since fan is now on low. Tech said that the fan was not damaged when he removed it from the old motor. He did say he is going to talk to his boss to see if he had any more ideas.

    I am wondering if the new fan could be bad. I can’t see that being very probable though.

  13. #13
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    Aug 2002
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    Well I hope he is not a moron and just set the fan to a lower speed tap without testing the temperature rise.

    Wow, I really hope.

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