Washer-dryer does not heat water; cycles take unusually long and E05 appears.

Safety first: Unplug the appliance. Water and electricity are a dangerous combination.

• Access the heater: On many Teka washer-dryer combos, the wash heater is located at the rear of the tub, accessible from the back panel. Remove the rear cover.
• Visual inspection: Look for signs of overheating, burnt connectors, or limescale build-up around the heater gasket.
• Test the element: Disconnect the heater wires. Use a multimeter set to ohms to measure resistance across the heater terminals. A typical value is 20–30 Ω; infinite resistance indicates a failed element.
• Check the NTC sensor: The temperature sensor is usually mounted in or near the heater bracket. Measure its resistance at room temperature and compare with Teka specifications (commonly 5–20 kΩ). If open or shorted, replace.
• Replace faulty parts: If the heater is defective, loosen the central nut, push the bolt inward, and carefully pry out the element. Clean the seat and install the new heater with a light smear of silicone-safe lubricant on the gasket.

Warning: If the heater and sensor test good, the fault may be on the PCB heater relay, which should be diagnosed by a professional.