Error code
tC8
Meaning
A fourth temperature sensor is reading abnormally
Moderate
What to do
Why this happens
Causes may include thermistor 4 having resistance out of range due to being open or shorted, wiring issues such as damage or disconnection, or failure in the PCB sensor circuit.
How to fix it
This one needs a professional technician to diagnose which sensor has failed and replace it.
SourceSamsung service manual