During Testing it was noticed that Fault 2 was indicated and one of the compressors would not run. Fault 2 does not indicate what the issue was and during inspection nothing could be detected. It had something to do with TCS:CHILCP3 and possibly CP2. CP1 could still be operated and was controlled manually to keep the temperature in the correct range. This was not required but it does affect the conductivity. The main power switch on the chiller unit was turned on and off and the fault was cleared. As far as I know this indicated either a freeze protect, flow, or refrigerant pressure fault. I will ask for TCS:TS6 and TCS:DIF2 to be added to the archiver so this can be further investigated in the future.