"Marina" wrote in message

Drain needs cleaning. Not, it is not normal unless the drain is
stopped up.




Doesn't there need to be something to allow air to escape?
I'm drawing a blank on the correct term.

There needs to be a loop or air gap in the line from the DW to the drain.
that is to prevent siphoning back to the DW. The sink drain should still
drain in the normal manner and yes, the plumbing system needs to have a
vent. But if the drain is clogged, the water will have no place to go, but
up into the sink.