What are the judgment methods and maintenance tests for repairing refrigerator faults?

There are many methods to judge refrigerator failure and maintenance detection, but generally speaking, the following principles can be followed:

-Take a look: observe whether there is any abnormality in each component, whether there is oil stain on each pipeline interface, whether there is frost layer on the evaporator, whether the thickness of frost layer is basically the same, and whether the purchasing sensitive components are loose and fall off.

-Listen 2: Listen carefully to the starting sound of the compressor after starting the machine. Under normal circumstances, the compressor runs normally within 1-3s of startup, and there is no abnormal sound.

-Three touches: Touch the temperature rise of the compressor by hand after power-on. Under normal circumstances, the temperature of the compressor should not be very high when it starts running, and it will gradually increase with the increase of running time. After electrifying 10~20min, touch the freezer of evaporator with your hand, and it should feel sticky.