Brand: DAIKIN
Category: Air Conditioning
Document Type: Manual
Language: EN
Manual for EWAD TZ
Uploaded: Sept. 12, 2025, 4:15 a.m.
The Microtech III controller manages the operation of air/water-cooled liquid chillers, controlling compressors, condensing devices, and safety features. It offers local control via a user interface, remote control via contacts, and network control via a BAS system. The HMI (Human Machine Interface) allows users to navigate menus, view unit status, set parameters, and acknowledge alarms. Key operations include unit setup, temperature adjustments, power conservation settings, and start-up procedures. The system provides diagnostic information through status LEDs.
Troubleshooting and error codes
| Symptom | Cause | Solution |
| Circuit status is Off. The compressor does not load anymore, circuit is immediately stopped. Bell icon is moving on controller's display. String in the alarm list: CxCmp1 OffVfdFault | Inverter is operating in an unsafe condition and for this reason the inverter must be stopped. | Check the alarm snapshot to identify the alarm code from the inverter. Contact your service organization to get the problem solved. |
| Circuit status is Off. The circuit is stopped. Bell icon is moving on controller's display. String in the alarm list: CxCmp1 OffVfdOverTemp | Insufficient motor cooling | Check refrigerant charge. Check if operational envelope of the unit is respected. Check operation of the cooling solenoid valve |
| Circuit status is Off. The circuit is stopped. Bell icon is moving on controller's display. String in the alarm list: CxCmp1 CondPressSen | Sensor is broken. | Check for sensor integrity. Check correct sensors operation according information about mVolt (mV) range related to pressure values in kPa. |
| Circuit is stopped if the discharge temperature reach the high limit value. Bell icon is moving on controller's display. String in the alarm list: Cx EcoEXVDrvError | Hardware Error | Contact your service organization to get the problem solved. |
| Circuit status is Off. The compressor does not start Bell icon is moving on controller's display. String in the alarm list: Cx OffNoPressAtStart | Evaporator or condenser pressure are below 35kPa | Check transducers calibration with an appropriate gauge. Check transducers cabling and readout. Check refrigerant charge and set it to the proper value. |