Gree GMV6 DC Inverter VRF Units Service Manual
2.145 "UC" Master Indoor Unit Set Successfully
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
The code indicates the state of the unit rather than the fault. During the commissioning process, the
unit prompts that the master indoor unit is already set successfully.
Possible causes: --
Troubleshooting: --
2.146 "UL" DIP Switch Error of Compressor Emergency Operation
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
The fault is displayed when the DIP switch of compressor emergency operation is not set within the
reasonable range.
Possible causes: --
Troubleshooting: Re-dial the DIP switch according to the DIP switch table.
2.147 "UE" Auto Refrigerant Charging Void
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
The code is displayed when the outdoor ambient temperature exceeds the range of auto refrigerant
charging (the normal range of charging refrigerant automatically is 0-40°C).
Possible causes: --
Troubleshooting: Disable the auto refrigerant charging. Instead, charge the refrigerant manually.
2.148 Ineffective Cooling and Heating
Applicable models: all indoor units
Fault diagnosis:
1) In cooling mode, when the electronic expansion valve is open to 2000PLS, the temperature of
outlet pipes of the indoor unit coil is over 5°C greater than the temperature of inlet pipes of the
indoor unit coil;
2) In heating mode, when the electronic expansion valve is open to 2PLS, the temperature of inlet
pipes of the indoor unit coil is over 12°C less than the saturation temperature corresponding to
the high pressure;
Possible causes:
■ The check valve of the outdoor unit is not opened fully as required.
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