The freezing point protection of Nanjing Tianyuan refrigerator has failed, so it is necessary to suspend the use of the refrigerator and check the failure. The freezing point protection of Nanjing Tianyuan refrigerator shows that the state of refrigerator refrigeration system is abnormal, such as insufficient refrigerant dosage and abnormal state of evaporation side. Don't continue to use the refrigerator at this time, but stop using the refrigerator, check and eliminate the faults before using it, so as to avoid repeated protection leading to more faults of the refrigeration unit.