1Noise:

Poor noise caused by compressor manufacturing: Generally, it can be detected by factory inspection. Noise outside the factory may occur after replacing the compressor, and the cause is generally due to welding flow during welding, such as motor sweeping noise and vortex disc noise.

Poor control of impurities during installation and insufficient lubrication after a period of operation can lead to abnormal noise from the compressor. It is necessary to confirm the suction and return oil filters, as well as the oil quality and quantity, and improve them.

　　2Motor damage

Fault manifestation: The air conditioner trips when powered on, abnormal resistance measurement (0 or infinite, etc.), and short circuit to ground. The coil is short circuited and burned, or the white groove melts, or overheated and burned.

Causes: Excessive impurities in the system can scratch the coil, leading to short circuits (mostly on the surface), or paint damage during the coil manufacturing process can cause short circuits (mostly on non surfaces), or overloading can cause the coil to age and burn out too quickly.

　　3. Damage caused by insufficient oil or lubrication:

Fault manifestations: air conditioning noise, power on tripping, dry surface of mechanism components, abnormal wear (lack of oil); The surface oil level of the mechanism is appropriate but abnormally worn.

Causes: Insufficient system oil return or high compressor temperature leading to low oil viscosity, or excessive refrigerant volume leading to low oil viscosity.

Lack of oil or insufficient lubrication

　　4Damage caused by excessive impurities

Fault manifestation: Irregular wear signs on the surface of the vortex disc.

Reason for occurrence: During the system installation process, there is a lot of oxide scale or dust and dirt in the system pipeline, and abnormal wear occurs due to insufficient oil return or lubrication in the system.

　　5. Cross slip ring fracture:

Fault manifestation: The compressor is running but unable to establish a pressure difference, accompanied by a rattling sound or stalling after a period of direct operation. The cross slip ring is broken, and there are many silver metal shavings and copper shavings inside.

Cause: Unbalanced starting pressure, often occurring immediately after charging the refrigerant.

　　6. High exhaust temperature:

Fault manifestation: The exhaust temperature of the compressor is too high during a short period of operation. Upon disassembling the compressor, it was found that the surface of the scroll plate is slightly overheated due to high temperature.

Causes: Poor ventilation of the external fan, refrigerant leakage or insufficiency, four-way valve leakage, system filter or electronic expansion valve blockage.

　　7Damage caused by excessive moisture:

Fault phenomenon: The surface of the mechanism is lightly plated with copper, and heavily rusted. The clearance between the scroll and the rolling piston and cylinder head is reduced by rusting and copper plating, resulting in increased friction.

Cause: Insufficient vacuum degree in the refrigeration system or excessive moisture content in the refrigerant.

　　8. Unable to establish pressure difference:

Fault manifestation: The compressor is running but unable to establish a pressure difference.

Cause: Incorrect wiring of the U, V, and W phases of the compressor, which often occurs during compressor maintenance.