Gree GMV5E Series Service Manual page 160

GREE
2.2.4.27 "C0" IDU and ODU, IDU wired controller communication error
Error display: ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
If no communication between ODU and IDU or between IDU and wired controller in continuous 30s,
report the error.
Possible reason：
■Communication wire is connected improperly or loose
■Communication wire is cut off
■Communication wire is in poor connection
■Connected wired controller quantity or address setting is improper
■Controller is abnormal
Troubleshooting:
If C0 isn't displayed on the ODU main control board, please check the network between IDU and
wired controller; if ODU main control board, IDU light board and wired controller all report C0, please
check the network between ODU and IDU and the network between IDU and wired controller; if only
wired controller reports C0, please check the network between IDU and wired controller and the wired
controller quantity and address settings.
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
156