Error code
F - SENSOR
Meaning
The freezer temperature sensor isn't reading correctly
Moderate
What to do
Why this happens
Possible causes include an open or disconnected connector, a wire that is cut or short-circuited, a defective freezer temperature sensor with abnormal readings, or an improperly seated MAIN PCB connector CN30.
How to fix it
This one needs a professional technician
SourceSamsung service manual