I would suspect low pressure from the pump. This is normally caused by the screen at the chopper blade stopping up with food particles. If you remove the lower rack, feed tube, and accumulator, then the inlet protector, this will expose the chopper blade. ( I usually use a shopvac at this point to prevent working underwater). If there is a lot of food particles on the screen, it's definitely losing pressure due to the stopped up screen. Check to ensure the chopper blade assembly hasn't got a broken shaft. If it has, of course, you'll have to replace the chopper assembly. If it's clear, ( no food particles), you should next check the spray arms the for separation. You see, the spray arms are made of a top and a bottom piece, melted together in the manufacturing process. If they separate, you lose water pressure through the separation and the water will only be circulated down low. Part numbers mentioned are as follows: Chopper blade assembly: AP4260709 Lower sprayarm assembly AP4429766 Center sprayarm AP4319201

My recommendation on the water inlet valve is that if it isn't filling properly, replace it. If anything were to happen that it overfilled, it could cause too much property damage if it flooded the home. Part number is AP4500374. =]