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  1. #1
    Join Date
    Jun 2014
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    3
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    Diagnosing buzzing ac

    My AC is buzzing, no start. I have three capacitors.

    1. 30uf is testing right around 30.
    3. 4uf is testing 3.5
    3. 15uf is testing 40uf !! Is this the culprit?

    Motor is free and spins smooth but will not start with help at all.

    Of course common knowledge is a low test is a bad capacitor, but I can't seem to find discussion on if it's too high.

    This is a 30 yr old GE unit. Yeah I know it's on its last leg but I'm just curious to see how long it lasts!

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    27,207
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    Quote Originally Posted by silver007 View Post
    My AC is buzzing, no start. I have three capacitors.

    1. 30uf is testing right around 30.
    3. 4uf is testing 3.5
    3. 15uf is testing 40uf !! Is this the culprit?

    Motor is free and spins smooth but will not start with help at all.

    Of course common knowledge is a low test is a bad capacitor, but I can't seem to find discussion on if it's too high.

    This is a 30 yr old GE unit. Yeah I know it's on its last leg but I'm just curious to see how long it lasts!
    it was on its last legs 10 years ago!

    3 run caps?

  3. #3
    Join Date
    Jun 2014
    Location
    Dover, DE
    Posts
    11,849
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    Please call your service provider. Per the site rules we can’t offer DIY assistance here.
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

    Local 486 Instructor & Service Technician

  4. #4
    Join Date
    May 2004
    Location
    Salt Lake City/Tooele
    Posts
    5,436
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    Your not going to get any diagnostic assistance or help here. May want to try another site, just the rules here.

  5. #5
    Join Date
    Jan 2010
    Posts
    19,279
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    Probably that GE cube. Those were some tuff compressors.
    No pun intended.

  6. #6
    Join Date
    May 2004
    Location
    Salt Lake City/Tooele
    Posts
    5,436
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    Quote Originally Posted by VTP99 View Post
    Probably that GE cube. Those were some tuff compressors.
    No pun intended.
    They were bullet proof. Had a condo complex with a bunch of those grinding away, you sure knew it was summer time when you drove through that complex....LOL I can still remember the model numbers on those they started with BGTA (Big, Gut, Tits and A$$).

  7. Likes VTP99 liked this post.
  8. #7
    Join Date
    Mar 2010
    Location
    Woodbridge, VA
    Posts
    263
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    Does the motor have open windings? Are the capacitors you listed the correct size for the application? Just because it's a 30 doesn't mean it supposed to be a 30. Plus you could be barking up the wrong tree. I think you need to have someone look at this and find the real culprit of what's going on.

  9. #8
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    44,180
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    Some of those units used 2x run caps for the pump... in parallel...

    Best to get a pro out... more to it than it appears to be...
    GA-HVAC-Tech

    Your comfort, Your way, Everyday!

    GA's basic rules of home heating and AC upgrades:
    *Installation is more important than the brand of equipment
    *The duct system keeps the house comfortable; the equipment only heats and cools (and dehumidifies)
    *Cheap is not good, good is not cheap; however expensive is not a guarantee of quality!
    Choose your contractor wisely!

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