Update: I have fixed the kitchen sink drain problem now, which was a difficult all day affair with a trip to HD and a subsequent thorough snaking of the basement pipes. The trpa was not the issue, I had a clogged run across the basement ceiling. Sadly it was not the source of my dishwasher problem.
I did some more diagnosis, the check valve and drain pump are good, the water is not coming back into the dishwasher from the sink (and never was). The d/w pumps down as expected at the end of each cycle. But I do get water 'build up' after a cycle, and the drain pump clears it away as needed.
So....I believe the water inlet valve is not shutting off completely, it allows water to enter the d/w slowly over time, and the pump has to run to remove that water.
For $40 I've ordered a new Bosch water solenoid, I'm going to start there. I should technically investigate a bit more, and if the valve was $200 I would....
Quote:
Originally Posted by 1990C4S
- it's not a bad fill valve, the water never goes above the normal fill volume
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When I wrote that point above I failed to consider the fact that the drain pump will cover up a leaking inlet valve by getting rid of the excess water...mea culpa. Probably the sort of thing a repair guy sees once per week.