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The issue appears to be that the chilled water temperature is not BELOW the coil entering air temperature. I suggest a detailed investigation of the plant supply water temperatures. Specifically, why is the chilled water temp greater than the coil entering air temperature?

Controller temperature setpoint = 11.82 [C]  
Controller sensed temperature = 12.17 [C]

The issue appears to be that the chilled water temperature is not BELOW the coil entering air temperature. I suggest a detailed investigation of the plant supply water temperatures. Specifically, why is the chilled water temp greater than the coil entering air temperature?

Controller temperature setpoint = 11.82 [C]  
Controller sensed temperature = 12.17 [C]
Controller actuator temperature = 12.20 [C]