Gree GMV-VQ680WM/C-X Service Manual page 189

Gree
2.124 "L6" Mode Conflict
2.125 "L7" No Master Indoor Unit
Fault display: wired controller of indoor unit and receiver of indoor unit display
Applicable models: all indoor units
Fault diagnosis:
The unit triggers the "no master indoor unit" fault when no master indoor unit exists in the system.
Possible causes:
■ The master indoor unit is disconnected;
■ The main board of the master indoor unit is replaced;
■ The main board of the master indoor unit is faulty.
Troubleshooting:
"L7" No Master Ind oor Un it
Whether all the i ndoor
units are connected to the same
power supply system?
boa rd o f th e master indoor uni t has
Yes
Whether th e main
bee n re placed?
GMV6 HR DC Inverter VRF Units Service Manual
Any delay in p owering on th e
master ind oor unit will tr igger
No
the "no master ind oor unit"
fault, which i s th en clea red after
the ma ster indoo r un it is
Yes
Reset the ma ster indoor un it
187
powere d o n.