Alarm beeps, E8 appears on the display, and the interior light or control panel behaves erratically.

Safety first: Disconnect power before removing trims or panels around the door frame.

Steps:

• 1. Check door closure: Ensure the door closes fully and the gasket is not obstructing. If the door is slightly open, the switch may not actuate.
• 2. Locate the door switch: On many De Dietrich models, the switch is a small plunger or magnetic sensor in the cabinet frame near the top or side.
• 3. Test the switch: For a plunger switch, press it in and out; the interior light should toggle. For a magnetic sensor, place a magnet near the sensor and observe if the light goes off (when powered). With power off, use a multimeter to check continuity when actuated.
• 4. Inspect wiring: Remove the switch from the frame and check the connector and wires for damage. Repair any broken conductors.
• 5. Replace the switch: If the switch does not change state electrically, install a new door switch or sensor of the correct type and rating.
• 6. If E8 persists: The main PCB input may be faulty. This requires board replacement by a technician.