Washing machine drain pipe overflows

Discussion in 'General Plumbing Help' started by Adam McDermott, Jan 26, 2019.

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  1. Jan 26, 2019 #1

    Adam McDermott

    Adam McDermott

    Adam McDermott

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    I bought a house recently and since I moved in, I can't get the washing machine drain to stop overflowing. I even installed a "water flow restriction" (which is just a C-clamp on the drain hose. I know this is not ideal, and it was a temporary solution) First I completely tore out the old drain pipe, because it was WAY too short of a standpipe, for code. That didn't help. After the flow restriction it no longer overflowed, and I kinda left it at that. But now it's back to overflowing, almost every single drain cycle that the machine does. It's absolutely maddening. Best as I can tell, I need to relocate the drain higher up on my 3 inch pipe, because what I suspect is happening, is that it's entering the pipe at a 90 degree angle, and is not able to go anywhere past that quickly enough, so it backs up back into the washing machine drain pipe, and out the top. It's either that, or the P-trap cant' handle the amount of water flow. I'm unsure of how much flow my washing machine outputs.

    It's weird, because my my old apartment, I never had any sort of issue like this with this same washing machine and I've never heard of this being a problem for anyone. Also weird is the my main 4 inch drain is located so high up on the wall, that I'm required to pump the washing machine to nearly the ceiling, especially if I'm going to have to relocate my drain higher on the 3 inch pipe.

    [​IMG]
     
  2. Jan 26, 2019 #2

    Geofd

    Geofd

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    if its not overflowing when not in use remove the ptrap clean out plug and snake from there
     
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  3. Jan 26, 2019 #3

    Adam McDermott

    Adam McDermott

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    That P-trap is one that I installed brand new less than 2 months ago.
    Are you suggesting that the 3 inch pipe is sending waste into the P-trap and clogging it?
     
  4. Jan 26, 2019 #4

    Geofd

    Geofd

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    there could be a random clog in the 2 inch.....you could remove the 3 inch plug there could be a partial clog in the 3 inch also try the 2 inch snake past the main drain entrance until your snake comes back clean...
     
  5. Jan 26, 2019 #5

    mike fiore

    mike fiore

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    when waste is coming down 3 inch it is probably clogging the inlet from washing machine. that's not the right fitting for application. it should be a wye fitting
     
  6. Jan 26, 2019 #6

    Adam McDermott

    Adam McDermott

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    I agree. Do you think a wye fitting would solve the issue, or should I cut out my washing machine drain and install it on the 3 inch pipe about a foot or two above where it is now? Which do you feel would be easiest? Mind you, I don't have a whole lot of experience fitting piping.

    If I do go the route of moving the washing machine drain pipe higher, is my washing machine going to be able to handle it? It's probably going to have to pump 6-7 feet up.
     
  7. Jan 26, 2019 #7

    Geofd

    Geofd

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    I looked at the pic again...the 4 " is capped off....with out reworking the 3' you could remove the 3" cap and use a threaded adapter...that way its a larger opening and you are going straight into the main rather than draining into the back of the 3" fitting
     
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  8. Jan 26, 2019 #8

    mike fiore

    mike fiore

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    geofd is correct.. you can remove cleanout plug and install male adapter with a 4x2 street y and a end clean out. cap old 2 inch and repipe new trap. I believe that would solve the problem.
     
  9. Jan 26, 2019 #9

    Adam McDermott

    Adam McDermott

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    Ah! I did not know i could add a section to a threaded cap end. This is fantastic!

    This is what i'm looking for, correct?
    What would an example of the male threaded fitting look like?
     
  10. Jan 26, 2019 #10

    nuecor

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    After removing mechanical ventilation, run a cycle on washer, if it doesn't overflow it's the ventilation that's faulty.
     
  11. Jan 26, 2019 #11

    Adam McDermott

    Adam McDermott

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    I'll try this idea. However, it was already overflowing before I installed this mechanical ventilation a couple months ago. I suspect it is not going to change anything :(
     
  12. Jan 26, 2019 #12

    nuecor

    nuecor

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    Yap, if it was overflowing already, then it's something clogging the drain
     
  13. Jan 26, 2019 #13

    mike fiore

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  14. Jan 26, 2019 #14

    Geofd

    Geofd

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    good point!!!!
     
  15. Jan 26, 2019 #15

    Adam McDermott

    Adam McDermott

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    I ran an empty load today at max water setting. It drained all the way down to the last 5 gallons or so until it came out the pipe and then if I ran it again, it would overflow almost immediately. I believe that there is a plug or (hopefully not) collapsed pipe somewhere between my house and the sewer main. I'm going to call a plumber to come snake the 4 inch pipe and see what he finds. I'll also ask him how he feels about my drain configuration while he's here.

    Thanks for the help, everyone!
     
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  16. Jan 27, 2019 #16

    TomFOhio

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    If your going to go off the end of the existing clean out which is how I would do it, I wouldn't put a p-trap in any less than
    3" and a stand pipe as high as you can get it. Around here you are not allowed to use a AAV on a washer drain.
     
    Last edited: Jan 27, 2019
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  17. Jan 27, 2019 #17

    Zanne

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    AAVs are not recommended for washer drains because the diaphragm can warp from the pressure created when the water drains. It takes an AAV that can handle high dfu, but even then, is not ideal.
     
  18. Jan 27, 2019 #18

    Diehard

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    What Zanne says is true, but in the case of a high washing machine flow and full drain line would Close the AAV. It's main purpose in that location is to protect the trap seal.
    Don't think it's affecting the ability to flow properly.
    Sounds like main line partially blocked, assuming the OP doesn't have a septic tank system.
     
    Last edited: Jan 27, 2019

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