Washing Machine Draining Back Into Sink

If you re going to connect the washing machine drain hose to the sink drain before the p trap the entire drain including the trap needs to be constructed of a 2 inch pipe.

Washing machine draining back into sink.

Increasing the inside diameter of the drain pipe to 2 might help more. The reason you want to have the drain pipe slightly larger is to allow for ventilation. How to fix the problem. The outside diameter of the drain hose attached to the washing machine is 1.

If the washing machine drains push it back into place but check as you do so that the hose isn t becoming pinched. The output from a washing machine is under pressure and a standard 1 1 2 inch sink p trap assembly is too small to handle it. The plumber has been here twice and installed a vent in the pipe but it still happens. I live in a raised ranch.

It s common for the washing machine to share a drain with a sink and if the laundry room is near the kitchen it could be the kitchen sink. About 7 years ago we installed the sink in this bathroom. Leave any drain cleaner time to work then repeat the drain test from step three. In either case you probably have a clog in the drainage pipe after the two combine.

In that case the first place where the air can leave is the vent but if the vent is clogged that means that the air will exit through the sink drain. The toilet and shower are backed up to the laundry room. Drain hose from washing machine pushed too far down into the drain pipe. Both drains may empty into a toilet waste line and be.

If the sink doesn t back up on its own when you do the dishes or run the faucet the clog is probably deeper in the pipes and only responds to the large volume of water being drained from your washing machine.