Error code
EXT-SENSOR
Meaning
The refrigerator cannot read the room temperature
Moderate
What to do
Why this happens
Possible causes include an open or slipped-out connector, wires that are cut or short-circuited, abnormal sensing temperatures exceeding +65°C or dropping below -50°C, or a defective sensor.
How to fix it
This one needs a professional technician
SourceSamsung service manual