Had a client this morning describe a problem for which I have no answer. So I thought I would post it here.
When the washer drains they get suds, not actual water, overflowing from the drain opening. While no water comes out, it is of course wet.
They have had the builder out, who has supposedly for some reason scoped the pipe and confirmed no blockage.
They have had an appliance guy out who says everything is fine with the machine.
They have changed soap brands/type and amounts.
They brought the washer with them when they moved and did not have this problem in their old house.
While I can think of a number of reasons for this drain to back up and overflow, I can’t come up with any for it to cause just suds to overflow. The circumstances seem to indicate that it is a problem in the drain plumbing. A vent problem?