Gree GMV-VQ680WM/C-X Service Manual page 115

Gree
(in this case the disconnected
indoor units display "C0") are
2.34 "C5" Indoor Unit Engineering SN Conflict
Fault display: commissioning software and remote monitoring software display the fault
The wired controller of indoor unit and receiver of indoor unit do not display the fault.
Fault diagnosis:
Check the engineering SN of indoor units, as the indoor units having the same numbers generate
the same fault. However, the fault is displayed and required to be removed only when the commissioning
software, centralized controller and remote monitoring are connected.
In the case of non-centralized control, the conflict in terms of the engineering SNs of some indoor
units, if any, do not affect the operation of themselves and of the entire system.
Possible causes:
■ The same engineering SN is configured for different indoor units;
■ The main board of indoor unit is from another unit.
Troubleshooting:
There are several ways to reset the conflicting engineering SN of an indoor unit:
by commissioning software;
by wired controller;
by commissioning the remote controller;
by pressing the Reset button on the main board of indoor unit so that the system reassigns the
numbers.
"C4" Indoor Unit Loss Fault
Whether all the indoor
units are energized?
Yes
Whether the
communication cables of
disconnected indoor units
connected properly?
Yes
The main control board of the
indoor unit may be abnormal
GMV6 HR DC Inverter VRF Units Service Manual
No
No
Connect the communication
Yes
Replace the main control
board
113
Power on the units
cables properly
;