Dryer stops mid-cycle and displays E03; clothes remain wet and drum may be hot.

Safety first: Unplug the dryer and allow it to cool completely before working near the heater or ducting.

• Clean airflow path: Remove and thoroughly clean the lint filter. For condenser or heat pump SMEG dryers, remove the condenser unit (if user-removable) and rinse it under warm water until clear. Ensure the air intake grilles are free of dust.
• Check exhaust duct (vented models): Inspect the flexible hose and wall vent for kinks, crushed sections, or lint buildup. Clean or replace the hose if restricted.
• Inspect NTC sensor: Access the heater housing or air duct (usually from the rear or front lower panel). Locate the NTC sensor (small probe with two wires). Disconnect and measure resistance at room temperature; compare to SMEG specifications (typically around 5–20 kΩ at 20°C). Replace the NTC if readings are out of range or unstable.
• Check wiring: Inspect the harness from the NTC to the main control board for damage or loose connectors. Reseat connectors firmly.
• Control board / heater relay: If the NTC and airflow are fine but E03 persists, the heater relay on the control board may be sticking, causing overheating. Replacement of the control module is recommended.