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Ice wall failure is mainly due to the refrigeration system contains excessive amounts of water, with the continuous cycle of refrigerant, refrigeration system of the water in the capillary outlet concentration gradually, due to the capillary outlet temperature minimum, frozen water gradually increased, to a certain extent will complete occlusion of capillary, refrigerant can't circulation, refrigerators refrigeration.

The main source of water in the refrigeration system is: the compressor motor insulation paper contains water, which is the main source of water in the system. In addition, refrigeration system components and connecting pipes due to inadequate drying and residual moisture; Refrigerant oil and refrigerant contain more than the allowable amount of moisture; In the process of assembly or maintenance, the pipeline is in the development state for a long time, so that the moisture in the air is absorbed by the motor insulation paper and the refrigerant oil. Because of the above reasons, the water content of the refrigeration system exceeds the allowable amount of the refrigeration system, and the ice block occurs. On the one hand, the ice block causes the refrigerant to be unable to circulate, and the refrigerator cannot be refrigerated normally; On the other hand, water will also react with refrigerant to generate hydrochloric acid and hydrogen fluoride, which will cause corrosion of metal pipes and components, and even lead to insulation damage of motor windings. At the same time, it will cause deterioration of refrigerant oil and affect the lubrication of compressor. Therefore, the water content in the system must be kept to a minimum.

The appearance of ice blockage in the refrigeration system is that the initial stage is working normally, the frost in the evaporator, the heat dissipation of the condenser, the unit runs smoothly, and the sound of the refrigerant activity in the evaporator is clear and stable. With the formation of ice block, the air flow can be heard gradually becoming weak and intermittent. When the blockage is serious, the sound of air flow disappears, the refrigerant circulation is interrupted, and the condenser gradually becomes cool. Due to the blockage, the exhaust pressure increases, the machine running sound increases, there is no refrigerant inflow in the evaporator, the frosting area gradually becomes smaller, the temperature gradually increases, and the capillary temperature also rises together, so the ice begins to melt, and the refrigerant begins to recycle again at this time. After a period of time, the ice block occurs again, forming a periodic open-block phenomenon.