1: freezer expansion valve and outlet valve improperly adjusted: too much refrigerant in the system: the refrigeration system there is air: the valve plate assembly sealing: compressor cylinder liner piston wear and tear.
2: compressor high-pressure output buffer tube fracture, or fixed this tube screws loose, resulting in high-pressure tube does not exhaust, low-pressure tube does not suction, so the compressor is running, but not refrigeration.
3: refrigeration system leakage, refrigerant all run out, the compressor is running, but no refrigerant in the system evaporates and absorbs heat, so the temperature inside the refrigerator does not fall.
4: capillary blockage, refrigerant can not enter the evaporator evaporation heat absorption, the refrigerator temperature does not fall.
5: freezer due to welding or improper use, so that the refrigeration system has a leak, the refrigeration system within the freezer refrigerant in a certain period of time all the leakage will not cool.
6: Check whether the freezer using the correct gear, gear different on the freezer power consumption and temperature have an impact.