Gree GMV-450WM/G-X - Page 158

Gree GMV6 DC Inverter VRF Units Service Manual
156
2.105 "L4" Supply Power Over-current Protection
Fault display: wired controller of indoor unit and receiver of indoor unit display
Applicable models: all indoor units
Fault diagnosis:
When the current supplied to the wired controller by the indoor unit is too large, the fault is generated.
Possible causes:
■ The wires of the wired controller are short circuited;
■ The main board of indoor unit operates improperly;
■ The main board of the wired controller is abnormal.
Troubleshooting:
"L4" Supply Power
Over-current Protection
Whether the p ower
cord of the wired con troller is
short circuited?
Replace the wire d controller
Yes
No
Reconnect the power cord of
the wired con troller
Yes
No
Is the main bo ard of the wired
controller abn ormal?
The main b oard of indoor
unit operates improperly
Replace the main bo ard of
indoor unit
Yes