The frequent start and stop of the industrial chiller compressor unit is generally due to insufficient refrigerant to make the compressor protection switch operate frequently. There is gas or blockage in the water system, which causes the water temperature to drop rapidly and rise rapidly. The water circulation is poor, and the water flow or load of the water system is too small. Observe the situation to determine whether the refrigerant is more or less. If the refrigerant is insufficient, the refrigerant should be inspected. The pump valve and pipeline clear the blocked part of the net purge gas, adjust the unit's circulating water volume and run the module.