Refrigeration compressor maintenance: The motor cannot start mainly due to faults in the power supply circuit, control circuit, and the motor itself.

The inability of the electric motor to move is mainly caused by compressor jamming or valve leakage.

Sudden shutdown during operation is mainly caused by low suction pressure, high exhaust pressure, low lubricating oil pressure, and motor overload.

Insufficient refrigeration capacity is mainly caused by thick frost on the evaporator, poor sealing and insulation performance of the freezer, large flow rate of the expansion valve, air in the system, excessive refrigerant filling, blocked filters, blocked expansion valves, insufficient refrigerant, and oil in the evaporator.

Not cooling; Mainly due to the inability of refrigerant circulation in the system.