Frequent start stop of industrial chiller compressor units is generally due to insufficient refrigerant, causing the compressor protection switch to frequently operate. There is gas or blockage in the water system that causes the water temperature to rapidly drop and then quickly rise, resulting in poor water circulation. If the water flow rate or load in the water system is too small, observe the situation to determine whether the refrigerant is sufficient. If it is insufficient, check the pump valves and pipelines, remove the blocked parts, and exhaust the gas. Adjust the circulating water volume and operating modules of the unit.