The top rack doesn't get clean. I ran it with the door open partially with the switch engaged. Everytime I checked, there was no water or spinning going on with the top and middle spin arms. Me and the floor got a nice shower. Water level adequate but experimented adding more water just in case. Even unnecessarily cleaned the filter where the water enters the dishwasher. Even though I got wet everytime I opened the door I would have expected more water pressure. It hardly reached the top but did deflect out in my face with an uncomfortable force.
The large screen in the bottom is clean. The housing under the screen was clean. I removed the 3 torx screws in the bottom and found a small white plastic ball which appears to direct water up the upper tube or the bottom spray arm, depending on impeller rotation direction. No plugs in the tube up to the top or the arms. I removed the motor and the impeller is clean and without damage.
Could the motor be weak enough to only send water to the lower arm? But yet it always comes out the bottom. Is there some control switch preventing the motor from reversing for top cycles? When I set the control to top rack only, it still only comes out the bottom. I removed our water softener to take to our new house and this problem started. Any possible connection? Boy I hope not cause it ain't coming back.