Gree GMV5E Series Service Manual page 162

GREE
Troubleshooting:
2.2.4.29 "C3" main control and inverter fan 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 fan drive board data in continuous 30s, report the error.
Possible reason：
■Communication wire between ODU mainboard inside module and inverter fan drive board is not
connected properly
■Inverter fan drive board is abnormal
■Mainboard is abnormal
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
158