Washing machine drain pipe overflow

Old 04-11-16, 05:38 PM
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Talking Washing machine drain pipe overflow

Hi all,

I'm hoping you can help me with a water problem I've been having.

Recently, my wife and I installed a new concrete pad in our laundry room, raising the height of the washing machine by about 3 inches. Since we moved the washing machine, and reinstalled it, the standpipe has overflowed when we do laundry. (Maybe about 2-4 cups worth a load?)

We've forced in the drain hose/tube as far as it will go, but it didn't help.

Any advice is appreciated!!

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Old 04-11-16, 06:09 PM
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Try lengthening the standpipe.

It doesn't matter how far you push the hose into the pipe. You aren't trying to create a seal. The water needs to have air allowed in to drain with the water.

Your standpipe may be too small in diameter.... I can't tell from picture. It should be 2" pipe..... and looks like 1-1/2" in the picture. The 1-1/2" trap is the restriction point. At one time 1-1/2" was the norm but washer pumps got stronger moving more water faster overwhelming the smaller size.
Old 04-11-16, 06:58 PM
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To small a pipe as mentioned or the trap or drains plugged up.
Old 04-12-16, 04:25 AM
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If that same Washer discharge used to work with the same sized drain pipe . . . . something has changed.

I'd suspect that there was some coagulated/solidified detergent on the inside of the pipe which may have slaked off (during movement or re-positioning) and partially blocked the pipe by wedging itself in the elbows.

Before doing anything mechanical, I'd try putting a few gallons of hot (boiling ?) water down the drain slowly and letting it sit a bit to dissolve any waxy soap build-up that might be present.

That's my 2
Old 04-12-16, 04:31 AM
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As washer repair man I think you have a blockage in drain. Did you replace trap when work was done? Remodel could have broken up gunk in pipes and lodged further down stream. No matter how far down pipe you push drain hose will not fix problem.

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