Customer Questions and Answers for Upper Wash Arm by Whirlpool

Stan, The upper spray arm isn't the likely issue, especially since you've checked and cleaned it. The next check needs to be at the water supply. First check and make sure the float and switch operate, raise and lower the float to make sure it moves freely and you can hear the switch "click". Then start the dishwasher on a regular wash cycle, allow the dishwasher to fill and wash for a few minutes (5 mins.) then unlatch the door and remove the lower rack. The water level in the bottom of the tub should be at most 1/4 inch below the element it should be closer or touching the element, if not there's not enough water in the dishwasher to properly distribute the water and produce enough pressure to operate the spray arms(s) and clean the dishes on all levels.