E9 error displayed; freezer may not cool and interior light or controls may behave erratically after a power event.

Safety first: Unplug the freezer before touching the control board.

Initial reset:

• Disconnect power for at least 10 minutes to allow capacitors to discharge.
• Reconnect and observe whether E9 clears. If it returns immediately, proceed.

Inspect main control board:

• Remove the rear lower panel to access the main PCB housing.
• Open the housing and visually inspect the board for burn marks, swollen capacitors, or moisture damage.
• Check all connectors for secure fit and correct orientation.

Corrective actions:

• Reseat connectors: Unplug and re-plug each connector to ensure good contact.
• Surge protection: If E9 followed a power surge, consider using a surge protector after repair.
• Replace main PCB: If E9 persists and there is evidence of board damage or known EEPROM corruption, replace the main control board with the exact Blomberg part number specified for your model. Ensure any configuration jumpers or DIP switches are set according to the service documentation.

Test: After replacement, restore power and verify that the display initializes normally, cooling starts, and E9 does not reappear.