After the dishwasher cycle finishes, the water drains out the bottom as it is supposed to. Then some (not all) of the water drains back into the bottom of the dishwasher, and a pool of water remains. Can you tell me what parts I need to troubleshoot it?
Is it fresh clean water or the drain water that left the DW?
Clean water would indicate the water valve on the DW not shutting completely off. Dirty water would indicate a plumbing problem. Does your DW drain hose rise (higher at some point), prior to where it goes into your house plumbing?
I have the same problem with my dishwasher@ After a full cycle runs in my dishwasher, clean water slowly drains back into dishwasher - over the course of a day, it usually fills the bottom. What to do?
Yes, the DW drain hose rises quite a bit before it enters the garbage disposal. It looks like it is the same water that the DW just finished pumping out, because when you hear the pump shut off, water immediately flows back into the DW. It appears clean, but I’m guessing it is the same water that just got pumped out.
Is it a new disposer buy chance? Water can’t run uphill, so if the hose rises higher then where it exits into the side of the disposer, you sure it’s actually draining? If you hear water running into the disposer, then my next question is why isn’t it going out the drain of the disposer into your house plumbing?
Not sure you’ve got a DW problem, unless it really isn’t actually draining.
It is normal for these dishwashers to have about a 1/4 inch of water in the tub. These pumps will self-destruct if run dry.
The drain hose must loop up about a foot higher then where it enters the house plumbing. Usually held with a strap to the bottom of the cabinet top.
If not when your pump shuts off the water in the hose drains back into the dishwasher, this causes a vacuum in the hose which can suck water up out of the drain. Same idea as siphoning gas out of a car.
Many installations use an air gap (siphon break) mounted on the cabinet top to overcome this problem.
Here is an install sheet for a GE that shows both the loop and an air gap install.
http://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=31-30515.pdf
Note that usually the higher loop is sufficient.
Also a partially clogged house drain will make this worse.