Gree GMV-VQ680WM/C-X Service Manual page 112

Gree
"C0" Communication Fault
Between Indoor and Outdoor
Units and Between Indoor Unit
and Wired Controller
Whether the
communication cables
between the main control board of the
outdoor unit and the indoor unit and between
the indoor unit and the wired controller
are incorrectly connected
or loosen?
Whether the
communication cables
between the main control board of the
outdoor unit and the indoor unit and between
the indoor unit and the wired controller
are disconnected?
Whether the contact between the
communication cable and terminal
block is poor?
Whether the number and addresses
of the wired controllers
are incorrectly configured?
The main control board of the
outdoor unit, the main control
board of the indoor unit or the
wired controller may be abnormal
2.31 "C2" Communication Fault Between the Primary Controller and
Inverter Compressor 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 compressor driver for 30 consecutive seconds, the
fault is generated.
Possible causes:
■ The communication cables between the main board of outdoor unit and inverter compressor driver
inside the module are connected improperly;
■ The inverter compressor driver operates improperly;
No
No
No
No
Yes
GMV6 HR DC Inverter VRF Units Service Manual
Yes
Connect the communication
cables properly
Yes
Replace the communication
cables
Yes
Make sure that the
communication cables are
properly connected
Make sure that no more than two wired controllers
are connected to the indoor unit at the same time;
Yes
when two wired controllers are connected to the
indoor unit at the same time, make sure they are
assigned with different addresses; when one wired
controller is connected to the indoor unit, make sure
it is set to the primary controller
Replace the main control board
of the outdoor unit, the main
control board of the indoor unit
or the wired controller
110