Neff Backflow from sink / slow leak through valve

Water remains in the bottom of the dishwasher between cycles, even when not in use.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Incorrect drain hose installation, Faulty non-return valve, Inlet valve not sealing fully

Safety: Turn off power and water before working on hoses or valves.

Check drain hose loop: Ensure the drain hose forms a high loop under the worktop to prevent sink water from flowing back.
Inspect non-return valve: Access the sump or drain pump outlet and check the non-return valve flap for debris or damage. Clean or replace if it does not close properly.
Check inlet valve: If clean water slowly appears in the tub, the Aquastop inlet valve may be weeping. Replace the Aquastop hose assembly.

Medium 3/5

Non-Return Valve

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