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Washing machine drain overflows with new washing machine water volume got a solution?. Answered

All other plumbing works great, this one backs up with new washer water volume during spin?  Can I run a snake down the vent? Any other suggestions?  I ask this because there doesn't seem to be an open airwary when draining high volume of water.  When washing machine stops draining the water flows down the pipe.  It is just when it is too much volume that the problem occurs.  Probably a gallon of water ends up on floor.   Need some advice.

Note that adjacent to laundry room is half bath and plumbing there is working fine, also kitchen sink and dishwasher are  within 15 feet and no problems from them. 

Looking for advice.



3 years ago

Just had that exact problem. The miniature threads of fabric dislodged by washing action are reducing the outflow pipe around bends and seriously reducing flow rate.

Clearing the fabric flem with a wire hanger solved the logjam for me.

As it turned out, our 1958 home had a 1 1/2 inch line from the washer to our sewer. We had to open the wall and install a larger capacity line for the efficient outflow from a new washer. Problem solved. BTW, tried everything else first as this solution cost money and required help. I thank everyone for their suggestions. jakmalak

Wow ! Bigger then an 1 1/2" that has to be a turbulent flow from the new washer.

I'm wandering if it was iron pipe and did you replace with PVC ?

Your washer may just be pumping too much water for the piping to handle

If none of the earlier suggestions work, you could try actually connecting your washer outflow to the drainage system, rather than simply letting the water pour down a pipe.

You should have a dedicate connection on the trap for your washing machine.
Using the overflow or air vent system can't work with newer machines as they pump out more water than this tiny pipe can handle.
It should work fine though if you just leave the hose hanging in the sink.


3 years ago

It could be that the drain pipe diameter is to small. Better washers with high speed pumps could overwhelm the line. A drain line relies on gravity and that will only create so much downward pressure so the speed of the drain will depend on the size of the pipe. You may have to replace that section with a larger one. I don't think they make governors for washer pumps.

If I was in your metaphorical shoes, I'd probably run a snake down the drain pipe first, then if still having problems I'd probably disassemble the trap and check it. for more information, is the water coming up from around the top of where the washer drain goes into the house drain? if not then you might have a crack somewhere in the pipe that when the water level gets high enough, or the pressure high enough it leaks water.
we've had so many washer drain problems over the years I can't even remember all the fixes. good luck.