Customer Questions and Answers for Dishwasher Pump Filter by Whirlpool

Jim, Unless you can see that the filter screens and bottom tabs are clogged with debris or sediment, that's probably not the issue. When it comes to poor cleaning on the top rack, your first check needs to be to make sure the dishwasher is filling properly. remove the lower rack, and start a wash cycle, let the machine run a few minutes(3-5) unlatch the door, and wait a few seconds then open the door and check if the water level in the bottom of the tub is in contact with, or partially covering the heater element, if not, there is not enough water in the machine to properly pressurize the pump and reach the top spray arm to wash properly. You will also need to check the docking port WP6-917647 on the manifold and make sure the rubber flappers are in the proper position and swivel properly. If there is not enough water in the tub, you will want to replace the fill valve 99002628 or W11082871 depending on serial number.