Microwave shows E12 when using sensor cook or reheat functions; standard timed cooking may still work.

Safety first: Unplug the microwave before internal cleaning near sensors.

Steps:

• 1. Clean the cavity roof and sensor area: The humidity (steam) sensor is usually located on the top or side wall behind a small grille. Clean the area thoroughly with a mild degreaser and soft cloth to remove grease film.
• 2. Avoid covering vents: Do not cover the sensor area with plastic wrap or large covers during sensor cooking.
• 3. Test standard cooking: If timed cooking works but sensor modes fail with E12, the sensor or its circuit is at fault.
• 4. Internal inspection (experienced DIYers): Remove the cabinet and locate the humidity sensor module. Check its connector and wiring for damage or looseness.

Note: If cleaning and reseating connections do not resolve E12, the humidity sensor module should be replaced.