Washer does not heat water; cycle may run long or stop with E05.

Safety: Unplug the washer. Heating components are live during operation; never test with covers removed and power applied.

• Access the heater: On most Neff washers, the heater is mounted at the bottom of the tub, accessible from the rear panel. Remove the rear cover to expose the heater terminals.
• Check wiring: Inspect the heater terminals and wiring harness for signs of burning, corrosion, or loose connectors. Reseat any loose plugs.
• Test the element: Disconnect the heater wires. Use a multimeter on resistance mode; a typical reading is 20–30 Ω. Infinite resistance indicates a failed element that must be replaced.
• Test the NTC sensor: The NTC is usually integrated into or near the heater. Measure its resistance at room temperature (commonly 4–20 kΩ depending on type). If open, shorted, or not changing with temperature, replace it.
• Replace heater if needed: Loosen the central nut on the heater clamp, gently push the bolt inward, and pry the rubber seal free. Remove the old heater, clean the seat, insert the new heater, and tighten the nut evenly to avoid leaks.
• Leak check: After reassembly, run a short hot wash and inspect the heater area for any water seepage.