Gree GMV6 DC Inverter VRF Units Service Manual
Yes
No
No
"bA" Oil Return
Temperature Sensor Fault
Whether the interface
terminal between the main board and
temperature sensor gets loose or
contains foreign matters?
Remove the foreign
matters and plug it tightly
Whether the temperature
sensor is abnormal?
Yes
Replace the temperature
sensor
The detection circuit may
operate improperly
Yes
Replace the main control
board
2.27 "C0" Communication Fault Between Indoor and Outdoor Units
and Between Indoor Unit and Wired Controller
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
There is no communication between the outdoor unit and indoor unit or between the indoor unit and
wired controller for 30 seconds, and a fault is generated.
Possible causes:
■ Communication cables are connected wrongly or get loose;
■ Communication cables are broken;
■ Poor contact of communication cables;
■ Number of wired controllers connected or addresses are set improperly;
■ Controller operates improperly.
Troubleshooting:
If the main control board of outdoor unit does not display C0, check the connection between the
indoor unit and the wired controller; if the main control board of outdoor unit, indoor unit's receiver and
wired controller display C0, check the connection between the indoor unit and outdoor unit and between
the indoor unit and wired controller; if only the wired controller displays C0, check the connection
between the indoor unit and wired controller, the number of wired controllers connected and address
settings.
Perform the troubleshooting as follows:
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