Top rack dishes are not getting clean while bottom rack is mostly fine.

Safety First: Turn off power and water if removing major components.

• Clean upper spray arm: Remove and flush the upper spray arm; clear any blocked jets.
• Check feed tube: Inspect the vertical feed tube at the back of the tub for cracks or disconnections from the sump and upper arm.
• Verify rack position: Ensure the upper rack is fully pushed in so the spray arm hub engages the feed tube properly.
• Diverter check: If lower arm works but upper does not despite clear arm and tube, the diverter may be faulty and require replacement.