Display shows E6 and the interior light or fan operation may be erratic when doors are opened or closed.

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

• Check door operation: Open and close the affected door while observing the interior light and fan. If they do not respond correctly, a door sensor issue is likely.
• Locate door sensor: On many Grundig models, the door sensor is a magnetic reed switch embedded in the cabinet frame, activated by a magnet in the door. Look for a small plastic cover or sensor area around the top or side of the opening.
• Inspect magnet and alignment: Ensure the door gasket and hinge are not warped, causing misalignment. Verify the magnet is present and firmly seated in the door edge.
• Test the reed switch (if accessible): With the unit unplugged, access the switch wiring and test continuity while placing a magnet near the sensor. Replace the switch if it does not open/close correctly.
• Check wiring: Look for pinched or broken wires where they enter the cabinet. These may require professional repair if embedded in foam.
• Replace faulty sensor: Install a compatible Grundig door reed switch or sensor assembly. Refit any covers and ensure the door closes smoothly.
• Restore power and test: Plug the fridge back in and verify that the E6 code clears and that lights/fans respond correctly to door opening.

If the sensor and wiring are good, the main PCB input circuit may be faulty and should be evaluated by a service technician.