1. less heat flowing in to the evaporator
2. air ingress in jacket water in evaporator.
3.High evaporator temperature and high condenser temperature.
4.Scaling or clogging of evaporator pipes.
5.no evaporation due to loss of vacuum
6.Malfunctioning solenoid valves.
7. outside of evaporator pipes dirty.
8. condenser pipe scaling.
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