Gree GMV-VQ680WM/C-X Service Manual page 197

Gree
2.145 "nF" Fan Type Unit
Fault display: main board of outdoor unit displays
Fault diagnosis:
The code indicates that the indoor unit only operates in fan mode.
Possible causes: --
Troubleshooting: not required.
2.146 "o3" IDU IPM module protection
Error display: ODU main board and IDU wired controller will display
Applicable model: external drive DC fan
Error judgment condition and method:
Check the error code on the display board, if it displays o3, that's the IDU IPM module protection.
Possible reasons:
■Contact of the fan UVW wire is poor.
■The fan is damaged;
■The fan blade is blocked (the fan blade is blocked and the motor shaft is rusty)
■The fan drive board is abnormal;
Troubleshooting:
GMV6 HR DC Inverter VRF Units Service Manual
195