Hi I have 10 year old Whirlpool Dishwasher model DU900PWKQ0. It loads water in fine but will only drain the water when there is just a small amount of water in the bottom Once the amount makes it up to the door, it wont drain. It drains fine when the amount of water is small but does not drain at all otherwise. I checked the check valve and replaced it, I also opened up the inside all the way down to the food chopper and cleaned it out. I checked the float and the Float switch. All are fine. I checked the hose and also ok as I noted when the amount of water is small in the dishwasher it drains fine. Any further thoughts on this is appreciated.

BTW can you tell me where the food chopper is located on your diswasher and how you accessed it? I am looking for the food chopper on mine. I think needs to be cleaned out. But cannot figure out where it is, based on diagrams on this site.

Is your dishwasher whirlpool model DU900PWKQ0. If not the parts will not in the same place as mine.