Upper rack dishes remain dirty while lower rack is mostly clean.

Safety first: Turn off power before removing spray arms.

• Clean upper spray arm: Remove the upper spray arm and flush it under water. Clear all jets with a toothpick.
• Check feed tube: Ensure the vertical feed tube at the back of the tub engages properly with the upper rack connector when the rack is pushed in.
• Inspect seals: Check the rubber seals where the feed tube connects to the tub and spray arm. Replace if cracked or missing.
• Verify pump performance: If both arms are weak, test the circulation pump as described earlier.