Gree GMV6 DC Inverter VRF Units Service Manual
■ The main board operates improperly.
Troubleshooting:
No
Yes
"C2" Communication Fault
Between the Primary Controller
and Inverter Compressor Driver
Whether the communication
cables between the main board of outdoor
unit and inverter compressor drive board
are connected properly?
Connect the communication
cables properly
No
Replace the compressor drive
board
The main cont rol board may be
abnormal
Yes
Replace the main control board
Whether the outdoor unit's
compressor drive board is normal?
Yes
2.29 "C3" Communication Fault Between the Primary Controller and
Inverter Fan Driver
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
When the outdoor unit fails to detect inverter fan driver for 30 consecutive seconds, the fault is
generated.
Possible causes:
■ The communication cables between the main board of outdoor unit and inverter fan driver inside
the module are connected improperly;
■ The inverter fan driver operates improperly;
■ The main board operates improperly.
Troubleshooting:
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