Variation of process parameters;
The nature of the working fluid changes;
Check if there is a problem with the performance of the vacuum pump;
If the flow of working fluid is insufficient, check whether the working fluid line is blocked;
Whether the pipeline leaks or not, check the entire process pipeline for leaks;
The pipeline is blocked, check the inlet filter and clean the pipeline;
The temperature of the working fluid is too high, check the heat exchanger, or replace the working fluid, and cool down the working fluid.