Microwave displays E4 and will not start any cooking program.

Safety: Unplug the appliance before cleaning internal components.

• Clean the cavity and sensor area: Locate the steam/humidity sensor opening (often on the top or side of the cavity). Clean the area thoroughly with a mild detergent and soft cloth to remove grease and steam residue. Do not use abrasive pads.
• Ventilation check: Ensure vents are clear so steam can escape properly; blocked vents can cause abnormal humidity readings.
• Power reset: After cleaning, leave the door open for 30 minutes to dry, then reconnect power and test.
• Inspect sensor connection (qualified persons): Remove the outer cover, trace the small harness from the sensor to the control board, and verify the connector is secure and wires are intact.
• Replace sensor if needed: If E4 persists, replace the humidity sensor with a Gorenje-compatible part and retest.