E6 appears on the display; water pump may not run, or the unit fills but does not circulate water over the evaporator.

Safety first: Unplug the ice maker and drain water from the tank before removing the pump.

• 1. Listen for pump operation: When starting a cycle (before unplugging), note whether you hear the small pump running. Silence with E6 suggests pump failure.
• 2. Access the water tank: Remove the top cover and ice basket. Locate the water tank and the small pump at its base with hoses attached.
• 3. Check for blockages: Disconnect the pump outlet hose and inspect for limescale or debris. Clean hoses and the pump inlet filter with warm water and vinegar.
• 4. Inspect the pump impeller: Remove the pump (usually held by clips or screws). Open the pump housing if possible and check that the impeller spins freely. Remove any debris.
• 5. Verify wiring: Reseat the pump connector on the harness and at the control board.
• 6. Replace pump if needed: If the pump does not run when powered and wiring is intact, replace it with an H.Koenig-compatible circulation pump.

Warning: Ensure all hoses are reconnected securely to prevent leaks when reassembling.