I have a kitchenaid dishwasher KUDP01FLSS0 that is not cleaning the top rack. I popped open the door and the middle spray arm is anemic, if it even turns at all. You can hear water dribbling inside instead of blasting as it used to be.

I had a repair man out twice. The first time, he chastised me for not cleaning my dishes and showed me gunk on the screen behind the cutter. He cleaned it and it worked a bit better, but a week later, same problem. He came back out and the screen again had all sorts of gunk - soft stuff, not like seeds or toothpicks. He cleaned it again and now a week later, same thing. For 8 years, we had NO issues. Now, it clogs 3 times in 3 weeks and we are even more conscience of rinsing first? Something else must be wrong. It is like there is not enough flow to flush out the screen during the cycle. Certainly, there is not enough recirculation pressure to get the upper spray arms working well.

Could this be a problem with the impeller? Pump motor? Why would the screen gum up 3 times in 3 weeks when it never happened before in 8 years? Any advice appreciated.

There is an interface between the motor shaft and the chopper shaft that was worn out and stripped. They fixed it by replacing the entire pump sump assembly and it works like new. The parts were around $150 but the parts and labor are ccovered under my home warranty (minus the $55 deductible). So I am a happy camper once again. I hope this thread can help others with the same problem. It is worth fixing.