Washer-dryer does not heat water; cycle runs cold and may extend in time with E05 displayed

Safety first: Unplug the appliance. Heating components are live during operation and can cause electric shock.

• Access the heater: On most Amica washer-dryer combos, the wash heater is mounted at the bottom of the tub from the rear. Remove the rear panel to expose the heater terminals.
• Check wiring: Inspect the heater connectors and wiring harness for signs of burning, looseness, or corrosion. Repair or replace damaged connectors.
• Test heater resistance: With a multimeter set to ohms, measure across the heater terminals. Typical values are around 20–30 Ω (check service manual for exact spec). Infinite resistance indicates an open heater that must be replaced.
• Test NTC sensor: The NTC is usually mounted in or near the heater bracket. Disconnect it and measure resistance at room temperature; it should be within the range specified by Amica (commonly 20–30 kΩ at 20°C). If readings are far off or do not change with temperature, replace the sensor.
• Replace faulty parts: To replace the heater, loosen the central nut, push the bolt inward to release the seal, and carefully pull the element out. Clean the seat and install the new heater with a new gasket, tightening the nut evenly.
• If E05 remains: The control board heater relay or triac may be defective. This requires board-level diagnosis or replacement by a qualified technician.