Dishwasher does not drain completely; small pool of water remains in sump after cycle.

Safety first: Disconnect power before working on the drain system.

• Inspect drain hose: Remove and flush the hose to clear grease or debris. Ensure there are no kinks.
• Check non-return valve: Access the sump outlet and inspect the check valve for debris preventing full closure. Clean or replace the non-return valve.
• Test drain pump: Run a drain cycle and listen for normal pump sound. If weak, consider replacing the drain pump.
• Verify hose height: Ensure the hose is installed at the correct height to prevent backflow.