Error code
F4
Meaning
Freezer section is not getting circulation air flow
Moderate
What to do
Why this happens
Potential issues include an error in the fan motor's feedback signal line contact, separation within the wiring, mechanical failure of the motor, seized bearings, or obstruction/jamming of the fan blade.
How to fix it
Clear any ice blockage or replace the freezer fan motor
SourceSamsung service manual