Display shows E11 and the door alarm may sound even when doors are closed.

Safety first: Disconnect power before removing control covers or door switch housings.

Inspection:

• Locate the door switch or magnetic reed sensor (usually in the cabinet frame or control housing).
• Check that the door closes fully and that gaskets are not preventing proper contact.
• Verify that the door magnet (if used) is present and aligned with the sensor.

Testing:

• Press the mechanical switch by hand; you should hear a distinct click.
• Test continuity across the switch terminals while pressing and releasing; replace if it does not change state.

Corrective action: Replace any faulty door switch or reed sensor. If the sensor is good but E11 persists, the main control board may be misreading the input and require replacement.