Safety: Disconnect power and water. Be prepared for residual water in the base when removing components.

E09 is a common Neff error indicating a failure of the heating element, usually integrated into the circulation pump.

Confirm no heating: Run a hot program and open the door after 15–20 minutes. If the water is cold and E09 appears, proceed.
Access circulation pump: Remove the dishwasher from the cabinet and take off the base panel. Locate the circulation pump with integrated heater.
Check wiring: Inspect the heater terminals and wiring for burning or loose connections. Reseat connectors.
Measure heater: Disconnect the heater terminals and measure resistance with a multimeter. An open circuit indicates a failed heater.
Replace assembly: On most Neff models, the heater is not separately replaceable; you must replace the entire Neff circulation pump / heater assembly. Transfer any seals and clamps as per service instructions.
Leak check: After reassembly, run a short cycle and inspect the base for leaks before pushing the dishwasher back into the cabinet.

Dishwasher completes cycle quickly with cold dishes and E09 displayed; no heating.

Possible Causes