Think air behind water. The drain must be properly vented for it to withstand the rush of water from a washing machine pump. If the washer drains into a dry well, then the dry well is probably clogged with lint. The easiest way to fix this is to seal up the washing machine waste hose against the open PVC pipe.
Then, can overloading a washing machine cause it to leak?
The washer can leak if it is overloaded or out of balance. If you have a washer that features a spray rinse function, interfering with the cycle by manually advancing the timer can cause the washer to leak. The manual advance can often cause the spray rinse cycle to go on too long and overflow.
Why does my washing machine keep filling up with water?
Water Inlet valve. The Water Inlet Valve on your washing machine is used to fill the tub with cold, warm or hot water for the wash and rinse cycles. To verify that the valve is at fault, unplug the washer when the symptom occurs. If the washer continues to fill, then the water inlet valve is defective.
What size pipe to use for washer drain?
The former requirement of 1 1/2-inch pipe is not enough to handle the fast drainage of modern washers. As with all plumbing fixtures and appliances, a washing machine drain pipe must also contain a P-trap. Position the trap between 6 and 18 inches above the floor, with a standpipe of 18 to 30 inches above that.