1. maybe there is not enough seed in the compressor.

2. it may also be one of your high voltage meters or low voltage meters.

3., it may also be a blockage of the filter, insufficient heat dissipation of the condenser or blockage of the shunt.

4. it may also be that the copper tube in your evaporator is too long, the copper tube in the condenser is too short, etc.

If your high voltage meter is also low, then the possibility of leakage of fluoride or fluoride is quite large. If it happens that a cold water machine is just a low pressure alarm, then everything is normal. It is necessary to start the chilled water pump before starting the compressor, but the general control system has a compressor delay, the user only need to start. The pump will run first and the compressor will start after the delay.