Error code
F7
Meaning
Freezer defrost heater is not functioning or overheating
Critical
What to do
Why this happens
Possible causes include defrost heater housing separation, contact error at the heater connector, disconnection in heater wiring, short circuit within the heater element, temperature fuse failure, or an incomplete defrost cycle with heating exceeding 80 minutes.
How to fix it
This one needs a professional technician to test the heater element and replace if defective
SourceSamsung service manual