Display shows dO or door icon; alarm sounds even when door appears closed

Safety: Unplug the refrigerator before accessing switch wiring or removing trims.

How to fix:

• 1. Check door closure: Ensure nothing is obstructing the door. Inspect gaskets for deformation that might prevent full closure.
• 2. Locate the door switch: It may be a plunger switch in the cabinet frame or a hidden magnetic sensor behind the liner. For plunger types, press it by hand and see if the interior light turns off.
• 3. Test the switch: With power off, remove the switch (usually clipped in) and test continuity with a multimeter while pressing and releasing it. Replace if it does not change state reliably.
• 4. Magnetic sensor models: If there is no visible switch, the sensor is behind the liner and the door has a magnet. Check that the magnet strip in the gasket is intact and not damaged. A missing or weak magnet can prevent detection.
• 5. Wiring and board: If the switch tests good, inspect wiring back to the control board for breaks. If wiring is intact, the board input may be faulty and require professional replacement.

Tip: As a temporary measure, you can usually silence the alarm via the control panel, but do not ignore a real open-door condition as it will spoil food.