Gree GMV6 DC Inverter VRF Units Service Manual
2.170 "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: --
2.171 "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.
2.172 "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.
2.173 “UF” Mode exchanger IDU identification abnormal
Error display: mode exchanger main board will display
Applicable mode: mode exchange box
Error judgment condition and method:
IDU main board is not compatible with the mode exchange box main board, which might trigger the identification
abnormality error of mode exchanger IDU.
Possible reasons:
■IDU and mode exchanger is not compatible
■Mode exchanger main board is damaged
Troubleshooting:
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