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

Safety warning: Disconnect power before touching the control board. Static discharge can damage electronics.

• Power reset: Unplug the cooler for at least 10 minutes to allow capacitors to discharge. Plug it back in and check if E9 clears. If it returns, the board may be faulty.
• Inspect wiring: Remove the rear service panel and locate the main control board. Check that all harness connectors are fully seated and that no pins are bent or burnt.
• Look for visible damage: Examine the board for burnt components, bulging capacitors, or scorch marks, which indicate board failure.
• Surge protection: If the error followed a power outage or lightning storm, consider using a surge protector in the future to protect the replacement board.
• Replace main control board: Order a "Phiestina main control board" for your exact model. Label and disconnect all connectors from the old board, remove mounting screws, and install the new board. Reconnect all harnesses firmly.
• Test operation: Restore power and verify that the E9 code is cleared and that cooling and controls operate normally.