1, the refrigerator refrigeration system leaks fluorine, that is, there is no refrigerant, or the refrigerant is not enough, resulting in the refrigerator not cooling. This often happens in refrigerators with long service life, and the pipes are iron pipes. After corrosion, the most intuitive phenomenon is that the compressor keeps working, but the temperature in the refrigerator does not decrease. Solution: Find a repairman, re-weld the pipeline, and take the time to refill the refrigerant. 2. The evaporator of air-cooled refrigerator is frosted. The main reason is that the air-cooled refrigerator has only one evaporator. The evaporator is frosted, the air outlet is blocked, and the cold energy cannot go out, resulting in the refrigerator being unable to cool. Automatic defrosting function is invalid. Solution: Check the defrosting system. Maybe the defrosting timer is out of order, or the heating pipe is burnt out. 3. There is ice blockage in the capillary of refrigerator, which indicates that it is normal to freeze frequently before, and the temperature in the fresh-keeping room is not low enough. Solution: It is also necessary to drain the refrigerant, clean the pipeline again, vacuumize and add refrigerant, and replace the drying pipe together if necessary. There is something wrong with the refrigerator compressor itself. The compressor can't be started because of the low pressure of the compressor return pipe, which leads to the refrigerator can't be cooled. Or compressor mechanical failure, cylinder stuck. Solution: Check whether the refrigerator power plug is plugged in or the power supply is insufficient. If the power generation is normal, it is a mechanical failure of the compressor itself, and basically only a new compressor can be replaced.