Gree GMV5E Series Service Manual page 163

GREE
Troubleshooting:
2.2.4.30 "C4" IDU missing 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 is in poor connection
■Power supply of IDU is cut off
■IDU mainboard is abnormal
Troubleshooting:
GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
159