Display shows E9 and the refrigerator may not cool properly or may shut down unexpectedly.

Safety: Unplug the refrigerator before accessing the control board. Avoid static discharge by grounding yourself.

Steps:

• 1. Power reset: Disconnect power for at least 10–15 minutes to allow capacitors to discharge. Plug back in and see if E9 clears. If it returns, proceed.
• 2. Inspect main PCB: Remove the rear control cover (usually at the back or top of the refrigerator). Visually inspect the board for burn marks, bulging capacitors, or corrosion.
• 3. Check connectors: Reseat all harness connectors to the board, ensuring they are fully seated and locked.
• 4. Surge protection: If the error appeared after a storm or power event, consider that the board may be permanently damaged.
• 5. Replace main PCB: If no external wiring faults are found and E9 persists, replace the main control board with the exact Haier part number. Transfer each connector one at a time to avoid miswiring.

Note: Some models may require a specific initialization or parameter setting after board replacement; consult the service documentation.