Dryer shows E42; door may remain locked or unlocked incorrectly; cycle may not start or may stop unexpectedly.

Safety first: Disconnect mains power before accessing the door lock or control board.

• 1. Inspect door lock connector: Remove the front panel or door lock cover to access the lock. Check that the wiring connector is fully seated and free from corrosion or burn marks.
• 2. Check for mechanical damage: Ensure the lock body is not cracked and that the actuator moves freely when the door is closed.
• 3. Electrical test: If competent, use a multimeter to check the lock coil resistance and switch contacts according to service data. Replace the door lock assembly if readings are out of specification.
• 4. Control board inspection: If the lock tests good but E42 persists, inspect the main PCB for burnt tracks or damaged components around the door lock relay (visual only; do not attempt board-level repair unless qualified).
• 5. When to call a technician: Door lock circuit faults often require professional diagnosis and may involve replacing the main control board.