Interior light stays on all the time, even when the door is closed, causing the cabinet to warm up.

Safety: Unplug the unit before accessing the door switch or control board.

A constantly lit interior light in a De Dietrich wine cooler usually indicates the door switch circuit is stuck in the 'open door' state.

• Check door closure: Ensure the door fully closes and that the gasket is not preventing full contact.
• Test the switch: Locate the door reed switch in the frame and the magnet in the door. With a multimeter, verify that the switch changes state when the door is opened and closed.
• Adjust magnet position: If the magnet is misaligned, adjust or replace the door trim so it lines up correctly with the switch.
• Replace faulty switch: If the reed switch does not operate correctly, replace it with a compatible De Dietrich part.
• Board check: If the switch works but the light remains on, the control board's input circuit may be faulty and require replacement.