Customer Questions and Answers for Dishwasher Pump And Motor Assembly by Whirlpool

Charles, The 6-4 error code indicates a drain or fill problem " 6- 4-Float Switch Open 1. Overfill switch stuck in “Overfill” position and/or dishwasher not level.2. Drain hose check valve not sealing." You will need to check under and around the float in the bottom of the tub, to make sure it's not stuck in the up position, check the float switch and linkage to make sure it's aligned and operating properly. Then check the drain line and drain loop to make sure the drain is routed properly and not siphoning the water out of the tub. Check the dishwasher for proper level and installation If all checks OK, start the dishwasher, allow it to fill and start the wash cycle, unlatch the door and remove the lower rack. Measure the depth of the water in the bottom of the tub, infront of the lower spray arm, it should measure 1/2 to 3/4 in.deep, if not, there's not enough water supplied to the fill valve to proper fill and circulate the water in the wash cycle.