When a residential dishwasher cleans items on the bottom rack effectively but leaves dishes, cups, or bowls on the top rack dirty, the issue is typically caused by a clogged upper spray arm, a low water fill level, or a blocked water feed tube connection at the back of the tub. If mineral scale or food debris blocks the tiny water jets on the rotating upper spray arm, water cannot reach the upper rack. You can troubleshoot spray arm circulation easily by inspecting the nozzles. You can verify that your corrective action is successful when removing the upper spray arm, clearing out trapped debris from the holes, and verifying that the rear water supply funnel clicks securely into place restores powerful cleaning jets to the top rack.
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