Safety first: Unplug the refrigerator before removing any covers or panels.

Steps to address SY CF:

1. Confirm the code: Note when SY CF appears (immediately at power‑up or after running). This can help a technician later.
2. Inspect harness between boards: Access the dispenser/control panel and the rear main control board. Trace the communication harness between them. Look for crushed sections where the door closes, or where the harness passes through the cabinet.
3. Reseat connectors: Disconnect and reconnect the harness at both the UI and main control board, ensuring each connector clicks fully into place.
4. Visual inspection of boards: Check for burnt components, discoloration, or corrosion on both boards. Any visible damage usually means the board must be replaced.
5. Replace suspect board: If wiring is intact, the most common repair is replacing the main control board. If that does not resolve the issue, the user interface board may also need replacement.

Due to the cost of boards and the need for accurate diagnosis, consider professional service if you are unsure.

Refrigerator displays SY CF; cooling may stop or become erratic.

Possible Causes