If standpipe overflows when washer drains, it’s clogged deeper – call a plumber if snaking fails.
To keep your washing machine drain clean and prevent future clogs and odors: cleaning washing machine drain
Over time, a combination of soap scum, fabric softener, lint, hair, and debris from pockets builds up in the drain hose and the standpipe. This leads to slow drainage, foul odors, and eventually, a flooded laundry room. If standpipe overflows when washer drains, it’s clogged

If standpipe overflows when washer drains, it’s clogged deeper – call a plumber if snaking fails.
To keep your washing machine drain clean and prevent future clogs and odors:
Over time, a combination of soap scum, fabric softener, lint, hair, and debris from pockets builds up in the drain hose and the standpipe. This leads to slow drainage, foul odors, and eventually, a flooded laundry room.