Dishwasher displays F4; may not start or may stop unexpectedly.

Safety: Turn off power before removing the inner door panel.

• Check door closure: Ensure the door closes firmly and is not obstructed by racks or dishes.
• Inspect latch strike: Verify the metal strike on the tub is not bent. Adjust slightly if needed so the latch engages fully.
• Test door switch: Remove inner door panel, locate the latch/switch assembly, and test continuity when the latch is closed. Replace the latch assembly if the switch is faulty.
• Secure wiring: Ensure all connectors to the latch are tight and not corroded.