Samsung RB Series Refrigerator Error Code F5 on Freezer Display
Samsung RB Series Refrigerator Error Definition = Freezer Temperature Sensor
How To Fix/What To Check = Disconnect power to the refrigerator and check the wire harness in the freezer temperature sensor circuit.
If the wiring connection checks good then replace the freezer temperature sensor.
If the issue is not resolved replace the electronic control board.
Parts That May Be Needed To Repair Refrigerator = Freezer Temperature Sensor or Electronic Control Board