The error codes on your refrigerator can help you troubleshoot the problem. The most common codes are: -Code defrost sensor error: There is a problem with the defrost sensor. -Ice maker (freezer) sensor error: There is a problem with the freezer sensor. -Code ice maker sensor error: There is a problem with the ice maker sensor. -Ice pipe heater error: There is a problem with the defrost heater. -Codes 39E or 39C defrost function error: There is a problem with the defrost cycle. -Codes 40E or 40C defrost fan error: There is a problem with the defrost fan. -Code 84C compressor lock: The compressor is locked and needs to be reset. If you see any of these codes, it is best to contact Samsung service for assistance.