F26 displayed; washer-dryer may not respond correctly to door open/close, or may not start.

Safety first: Unplug the appliance before working on the door system.

• Check door strike and hinges: Ensure the door closes fully and the strike engages the lock. Replace a broken strike and adjust hinges if needed.
• Inspect door lock switch: Access the door lock assembly and test the door-closed switch with a multimeter. It should show continuity when the door is closed and none when open.
• Verify wiring: Confirm the harness from the door lock to the main control is intact and firmly connected at both ends.
• Replace lock assembly: If the switch does not operate correctly, replace the entire KitchenAid door lock assembly.
• Test operation: Reassemble, restore power, and start a cycle to confirm the error is cleared.