Dishwasher powers on but will not start a cycle; Start button unresponsive or program will not begin.

Safety: Disconnect power before removing the door panel or control fascia.

• Check child lock: Many Neff models have a child lock. Look for a key symbol on the display and follow the user manual to deactivate (often holding a specific button combination).
• Confirm door closure: Ensure the door closes firmly and is not obstructed by dishes. Listen for the latch click.
• Test door switch: If the machine powers but will not start, the door lock switch may not signal closed. Access the lock assembly and test continuity when the latch is engaged. Replace if faulty.
• Inspect control panel: Remove the inner door panel to access the user interface board. Check for moisture ingress or corrosion at the ribbon cable. Dry and reseat connectors.
• Replace UI board: If specific buttons do not respond and the board shows signs of damage, replace the Neff control panel / UI module.