Refrigerators manufactured by Samsung have a built-in self-diagnostic system. In many cases, if your appliance detects a problem, it will show an error code on the digital temperature display you can see inside (it will be displayed instead of the temperature). The error code display may start blinking. Typically, several minutes later, the display will reset itself. If this has not happened, you may do it manually.
Unplug the refrigerator (in some cases, you may consider flipping the circuit breaker).
Wait from five to ten minutes.
Supply power back to the refrigerator. The error codes will clear.