GREE U-Match 5 SERIES UNIT SERVICE MANUAL
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Wired control temperature sensor error
IDU or ODU memory chip error
Electric box sensor error
Compressor overload protection
Driver out-of-step protection
Compressor phase-sequence protection
4–way valve switch-over error
Master control and driver communication error
Driver module sensor error
Driver module high temperature protection
Sensor connection protection
Temperature drift protection
Bus low-voltage protection
Bus high-voltage protection
Phase-loss and anti-phase protection
ODU error, for specific error please see the status of ODU indicator
Emergency stop (fire alarm)
If malfunction occurs during operation, LCD temperature display zone will show the failure information. If
several malfunctions occur at the same time, their corresponding error codes will be shown in turn. When
malfunction occurs, please shut off the unit and send for professional personnel to repair. For example, E1 (as
shown below) indicates high pressure protection.