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Thread: What on Earth is this sound coming from the compressor? (video)

  1. #1
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    Question What on Earth is this sound coming from the compressor? (video)

    Goodman GSX140251KA / 1503148998

    Amp draw and voltage at the contactor were steady. I believe it was drawing about 7 amps with an RLA of 10.9. Pressures were steady as well at 139 and 370. SH and SC were 9.9 and 1.4 respectively.


  2. #2
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    That is weird. I don't have a clue.

    Sent from the Okie state usin Tapatalk

  3. #3
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    My wife says aliens are trying to communicate with you through it.

    Sent from the Okie state usin Tapatalk

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  5. #4
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    That's weird. Normally they use the fillings in my teeth.

  6. Likes R600a, CEAS-AC-TECH liked this post.
  7. #5
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    Chattering contactor? What metering device you have? Goodman install guide says for TXV superheat and subcooling 7-9 degrees.

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  9. #6
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    It was definitely coming from the compressor.

  10. #7
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    Check the wires at the compressor itself? Run system with the outdoor fan motor deenergised for a short time to try to isolate. Does it have a start assist kit installed? What does the points look like at the contactor?

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  12. #8
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    The only thing I have seen do anything sorta similar was a trane with the suction lines passing under the coil and was rubbing in a cyclic pattern but it wasn't nearly as on and off.

    Sent from the Okie state usin Tapatalk

  13. #9
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    That sounds like a pin is about to burn off the compressor. Let's not talk about how I know this
    You don't squat with your spurs on.
    And you NEVER put the torches away before pressure testing.

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  15. #10
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    Quote Originally Posted by Restaurant mech View Post
    That sounds like a pin is about to burn off the compressor.
    Are you saying that the Fusite could be failing? It's been making that noise since at least last year.

    I share this link about Fusites for my customer who may be reading this thread and for anyone else that doesn't know the term Fusite.

  16. #11
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    I'm saying that I hear 60 hertz . Likely not the fusite itself at this point but it sounds like an intermittent connection.
    I'd be pulling the plug off the compressor and having a really good look at all connections.
    Sometimes you can have a connector just tight enough to start the compressor, but once the compressor runs and vibrates a little the connection comes loose and you can hear the miniature arcing
    You don't squat with your spurs on.
    And you NEVER put the torches away before pressure testing.

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  18. #12
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    Intermittent flood back.... My guess from the sound. TXV hunting?

    Sound is no load/full load.
    “A dying culture invariably exhibits personal rudeness. Bad manners. Lack of consideration for others in minor matters. A loss of politeness, of gentle manners, is more significant than is a riot.”
    ― Robert A. Heinlein

  19. #13
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    I once put my elbow on a cap while trying to amp draw a motor....

    It lit me up internally the same way that compressor sounds.....

    Look at all the wiring, make sure nothing is arcing, make sure there is no wires hooked up wrong at contactor, replace the cap and make sure its wired correctly, add a hard start.

    I would also be suspicious of the contactor.

    pull the compressor harness and make sure there's no issues with it.

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  21. #14
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    You have a SH of 10 and SC of 1.4? Sounds to me like a compressor that is starving and every once in a while it gets enough freon to quiet down. Check your discharge temp, my guess is it is running high. I have heard some scroll rattle/knock when they are running low on juice.

  22. #15
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    Quote Originally Posted by BNME8EZ View Post
    You have a SH of 10 and SC of 1.4? Sounds to me like a compressor that is starving and every once in a while it gets enough freon to quiet down. Check your discharge temp, my guess is it is running high. I have heard some scroll rattle/knock when they are running low on juice.
    That just reminded me of a crazy tenant that was telling me about how some other tech came out and over charged his ac so bad that the rod was knocking. It was a scroll.

    Sent from the Okie state usin Tapatalk

  23. #16
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    Quote Originally Posted by R600a View Post
    That just reminded me of a crazy tenant that was telling me about how some other tech came out and over charged his ac so bad that the rod was knocking. It was a scroll.

    Sent from the Okie state usin Tapatalk
    Yeah funny how that can work isn't it.. In this case even with a fixed MD 1.4 SC is low. The other thing could be poor air flow which 10 SH with that low of SC could indicate.

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  25. #17
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    Sounds exactly like a scroll with an unloader. But I've never seen that on a smaller unit.
    I do a triple evac with nitro to remove non condensables.

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  27. #18
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    Hopefully its registered so you get that compressor free

  28. #19
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    California has a decades-old law that prohibits registration to qualify for the full warranty. I've successfully processed a number of 6-10 warranties on equipment that wasn't registered.

    Most techs locally either don't know about the law or pretend that they don't. A manager of a local Rheem wholesaler claimed he didn't know about it. A rep at Lennox's warranty department pretty much did the same. Convenient.

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  30. #20
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    Man .... we are running out of GOOD things to say about California

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