Display shows E10; refrigerator may not defrost properly and may show irregular temperature readings.

Safety: Unplug the appliance before accessing the control board or defrost wiring.

Steps:

• 1. Power reset: Disconnect power for 15 minutes to reset the control logic. Restore power and monitor if E10 reappears after a full cooling/defrost cycle.
• 2. Check defrost components: Verify that the defrost heater and defrost sensor are functioning (see E3 and E4 procedures). A failed component can cause the board to log a defrost control error.
• 3. Inspect main control board: Access the board at the rear of the unit. Look for signs of overheating around the defrost relay area.
• 4. Manual defrost test (if service mode available): Some Hansa models allow entering a service mode to force a defrost cycle. If the heater does not energize in forced defrost but tests good, the board is likely faulty.
• 5. Replace main control board: If defrost components are good and E10 persists, replace the main control board with the correct Hansa part number.

Note: Incorrect defrost control can lead to heavy ice buildup and poor cooling, so address E10 promptly.