Washer-dryer stops during wash or rinse; display shows E05 and water in drum may be cold.

Safety first: Unplug the appliance and allow it to cool before working near the heater.

• Access NTC sensor: On most SMEG washer-dryer combos, the NTC is mounted in the heater bracket at the rear or bottom of the tub. Remove the rear panel to access it.
• Inspect wiring: Check the NTC connector for corrosion, loose pins, or damage. Reseat the connector firmly.
• Test NTC: Using a multimeter, measure resistance across the NTC terminals at room temperature. Typical values are around 20 kΩ at 20°C (check SMEG service data). If reading is open-circuit or near 0 Ω, replace the NTC sensor.
• Check heater: While there, test the heating element for continuity and insulation to earth. A shorted heater can sometimes trigger sensor-related errors.
• Replace faulty parts: Install a new NTC sensor (and heater if needed), ensuring it is fully seated in the heater pocket with good contact.
• Test cycle: Reassemble panels, reconnect power, and run a 60°C wash to confirm proper heating and that E05 does not reappear.