Zanussi Partial Drain / Siphon or Installation Issue

Water remains in the bottom of the dishwasher after the cycle, but no error code is shown.

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

Drain hose installed without high loop, Backflow from sink due to blocked trap, Non‑return valve stuck open, Weak drain pump

Safety first: Unplug the dishwasher before adjusting hoses.

Check hose height: Ensure the drain hose rises to the recommended height under the worktop before connecting to the sink trap to prevent backflow.
Clean sink trap: Remove and clean the sink trap and spigot where the hose connects.
Inspect non‑return valve: Access the sump and check the non‑return valve flap for debris preventing closure.
Test drain pump: Run a drain program and observe the flow into the sink. A weak or intermittent flow may indicate a failing pump.

Medium 3/5

Non‑Return Valve

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