196.4 - Alarm codesAlarmNo.AlarmcodeAlarm description Reset type Probable cause Action taken by the controlThermistor faults1 th-01 Sensor fault, fluid entering water heatexchangerAutomatic when the temperaturemeasured by the sensor returns to normalDefective thermistor Unit is shut down2 th-02 Sensor fault, fluid leaving water heatexchangerAutomatic when the temperaturemeasured by the sensor returns to normalDefective thermistor Unit is shut down3 th-03 Defrost sensor fault, circuit A Automatic when the temperaturemeasured by the sensor returns to normalDefective thermistor Unit is shut down4 th-04 Defrost sensor fault, second coil Automatic when the temperaturemeasured by the sensor returns to normalDefective thermistor Unit is shut down5 th-10 Outside temperature sensor fault Automatic when the temperaturemeasured by the sensor returns to normalDefective thermistor Unit is shut down6 th-11 CHWS fluid sensor fault (master/slave) Automatic when the temperaturemeasured by the sensor returns to normalDefective thermistor The master/slave mode isstopped7 th-12 Suction sensor fault Automatic when the temperaturemeasured by the sensor returns to normalDefective thermistor Unit is shut down8 th-24 Economiser sensor fault Automatic when the temperaturemeasured by the sensor returns to normalDefective thermistor Unit is shut downPressure transducer faults9 Pr-01 Discharge pressure transducer fault Automatic when the voltage transmittedby the sensor returns to normalDefective transducer or connectionfaultUnit is shut down10 Pr-04 Suction pressure transducer fault Automatic when the voltage transmittedby the sensor returns to normalDefective transducer or connectionfaultUnit is shut down11 Pr-13 Economiser pressure transducer fault Automatic when the voltage transmittedby the sensor returns to normalDefective transducer or connectionfaultUnit is shut down12 Pr-24 Water pump pressure transducer fault Automatic when the voltage transmittedby the sensor returns to normalDefective transducer or connectionfaultUnit is shut downCommunication fault13 Co-E1 Communication loss with the EXVboardAutomatic when communication isre-establishedInstallation bus fault or defectiveslave boardUnit is shut down14 Co-O1 Communication loss with PD-AUXboard No.1Automatic when communication isre-establishedInstallation bus fault or defectiveslave boardUnit with optional water pressuresensors, unit is shut down.15 Co-O2 Communication loss with PD-AUXboard No. 2Automatic when communication isre-establishedInstallation bus fault or defectiveslave boardNone16 A1-01 CP A1 fault: Kriwan electricalprotection openManual Compressor overheating Compressor is shut down17 A2-01 CP A2 fault: Kriwan electricalprotection openManual Compressor overheating Compressor is shut downProcess faults18 P-01 Water heat exchanger frost protection. Automatic if the same alarm has not trippedduring the last 24 hours, otherwise manual.Water flow rate too low or defectivethermistorUnit is shut down19 P-05 Low suction temperature. Automatic when the temperature returns tonormal, and if this alarm has not appearedduring the last 24 hours, otherwise manual.Pressure sensor defective, EXVblocked or low refrigerant chargeUnit is shut down20 P-08 High superheat Automatic when the temperature returns tonormal, and if this alarm has not appearedduring the last 24 hours, otherwise manual.Pressure sensor defective, EXVblocked or low refrigerant chargeUnit is shut down21 P-11 Low superheat Automatic when the temperature returns tonormal, and if this alarm has not appearedduring the last 24 hours, otherwise manual.Pressure sensor defective, EXVblocked or low refrigerant chargeUnit is shut down22 P-14 Water flow control and customerinterlock faultAutomatic if the unit is in manualshut-down status, otherwise manual.Heat exchanger pump defect orwater flow switch faultUnit is shut down, if the alarmoccurs in defrost mode, if notthe unit remains on.23 P-16 Compressor A1 not started or nopressure increase registeredManual Connection problem Compressor is shut down24 P-17 Compressor A2 not started or nopressure increase registeredManual Connection problem Compressor is shut down25 P-29 Communication loss with the SystemManagerAutomatic when communication isre-establishedCCN installation bus defective Unit goes into autonomousmode26 P-30 Communicaiton loss between masterand slaveAutomatic when communication isre-establishedCCN installation bus defective Unit goes into autonomousmode27 P-31 CCN emergency stop Manual Network command Unit is shut down28 P-32 Fault water pump 1 Manual Pump overheating or poor pumpconnectionUnit is completely stopped ifthere is no emergency pump29 P-37 Repeated high pressure unloading Automatic Transducer defective or fan circuit fault None30 P-40 Repeated low suction temperatureunloadingManual Pressure sensor defective orrefrigerant charge too lowUnit is shut down31 P-43 Heat exchanger temperature too low,less than 8°C, prevents unit start-upAutomatic when the temperature detectedreturns to normalOperating compressor protectionout of range or pressure sensor faultThe unit cannot start32 P-50 Refrigerant leak Automatic when the concentration returnsto a lower value than the normal thresholdRefrigerant leak or volatilecomponents present in the machineatmosphereNone33 P-63 High pressure fault Manual Fan fault Unit is shut down34 P-97 Reversed entering/leaving water sensors Manual Sensor defective, sensors reversed Unit is shut down35 MC-nn Master chiller configuration error Automatic when the master configurationreturns to normal or when the unit is nolonger in master/slave modeMaster/slave configuration error Master/slave mode is stopped36 FC-nO No factory configuration Automatic if the configuration is entered Unit size has not been configured Unit is shut down