SY CF
Frigidaire Professional
Main Control to User Interface Communication Failure
Refrigerator displays SY CF; unit may not cool or may behave erratically.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Failed main control board, Failed user interface board, Open or shorted communication harness, Oxidized or loose connectors
How to Fix / Troubleshooting
Safety First: Unplug the refrigerator before removing any covers or boards.
- 1. Visual inspection: Remove the rear access panel to expose the main control board. Look for burnt components, discoloration, or insect/rodent damage.
- 2. Check harness continuity (advanced): If you have a multimeter and skills, test continuity of the communication harness between the UI and main board. Repair or replace damaged wiring.
- 3. Reseat connectors: Disconnect and reconnect the UI harness at both the main board and the UI board. Ensure no pins are bent.
- 4. Replace likely failed board: In many Frigidaire Professional models, a SY CF that persists after reseating connectors points to a failed main control board. Replace with the exact part number from the model/serial tag or parts diagram.
- 5. If problem remains: Replace the user interface board as well, or have a technician perform board-level diagnostics.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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