Display shows E3 and the refrigerator interior light and controls may behave erratically.

Safety first: Disconnect mains power before removing the control panel or display housing.

E3 on some SMEG refrigerators indicates an ambient (room) temperature sensor fault used for adaptive control.

• Step 1 – Locate sensor: The ambient sensor is often located behind the top control/display panel or in a small grille on the front fascia. Remove the trim or panel carefully using a plastic pry tool.
• Step 2 – Inspect connections: Identify the small NTC sensor and its two-wire connector. Check for loose fit, corrosion, or broken wires. Reseat the connector.
• Step 3 – Check cable routing: Ensure the harness is not pinched where it passes into the cabinet or door. Repair any visible damage with proper splices or replace the harness if necessary.
• Step 4 – Replace sensor if needed: If the sensor body is cracked or readings are out of range (if tested with a multimeter), replace it with a SMEG-compatible ambient NTC sensor.
• Step 5 – Test operation: Reassemble the control panel, restore power, and verify that E3 clears and that temperature control responds normally.
• Step 6 – PCB diagnosis: If the error persists with a new sensor and intact wiring, the main control board may be defective and should be evaluated by a technician.