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Why compressor of water chiller not run?

Why compressor of water chiller not run?
Update Time:2017-09-21
Q: Why compressor of water chiller cannot be started?
A: Once compressor cannot be started, please check the following parts
1. Check the compressor overload relay, pressure switch, overcorrect relay tripped or broken;
2. Check the cold/chilled water sensor is connected well or broken;
3. Check the compressor wire connection is correct;
4. Compressor open or short circuit;
5. AC contractor of compressor is broken;
  Lydia