Dishwasher displays E13 and may not start; often associated with door lock or door switch issues.

Safety first: Disconnect power before working on the door assembly.

• Check door closure: Ensure the door closes firmly and is not obstructed by overfilled baskets or protruding utensils.
• Inspect latch hook: Examine the metal or plastic latch on the tub frame for bending or breakage. Replace if damaged.
• Access door lock: Remove the inner door panel to expose the door lock assembly. Check for cracks, burnt contacts, or loose connectors.
• Test switch continuity: With a multimeter, verify that the door switch closes (shows continuity) when the latch is engaged.
• Replace faulty lock: If the switch does not operate correctly, install a new SMEG door lock assembly and reassemble the door.