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Causes of compressor discharge temperature being too high: The following introduces these reasons, hoping to be helpful to everyone. 1. The refrigerant is low. 2 The opening of the expansion valve is too small, and the expansion valve is about to break. 3 The refrigerant system filter dryer is clogged. 4 The evaporation temperature is too high. The chilled water temperature is high, or the ambient temperature of the indoor evaporator is high. 5. The refrigerant is of poor quality and mixed with air or moisture. If there is water, ice blockage of the expansion valve will also cause the return air temperature to be high. 6. If it is a Bitzer screw machine, it is also possible that the compressor oil filter is blocked, the oil pressure is insufficient, and the loading slide valve does not move. 7. The condensation effect is not good, and a large amount of gaseous refrigerant flows back into the expansion valve, which will also cause the return air temperature to be high. 8. The oil filter is clogged (high pressure is high, low pressure is low, and the refrigerant is recharged with high pressure alarm). 9. The bearing is damaged, causing friction in the mechanical part, resulting in high suction temperature, overheating of the motor, and correspondingly high exhaust temperature. Cause of noise failure: 1. The foundation bolts are loose and vibrating. 2. Too much oil causes liquid shock. 3. The working fluid enters the gas valve and causes liquid shock. Repair method: 1. Tighten the foundation bolts. 2. Check the oil level. 3. Turn down the expansion valve or temporarily close it.