Gree GMV5E Series Service Manual page 161

GREE
2.2.4.28"C2" main control and inverter compressor drive communication error
Error display: ODU mainboard, IDU wired controller and IDU receive light board will
display
Error judgment condition and method:
If ODU hasn't received inverter compressor drive board data in continuous 30s, report the error.
Possible reason：
■Communication wire between ODU mainboard inside module and inverter compressor drive board
is not connected properly
■Inverter compressor drive board is abnormal
■Mainboard is abnormal
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
157