Gree GMV-VQ680WM/C-X Service Manual page 198

Gree
of each indoor fan phase equal? Is the insulation
against ground of winding of each fan phase normal
2.147 "o7" IDU non-synchronism 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 o7, that's the IDU non-synchronism 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)
■Fan drive board is abnormal;
Troubleshooting:
"o3" IDU IPM module
protection
Check if the contact of U, V and
W wire of indoor fan is good
Yes
Check is the resistance among winding
(normal value is over 2mΩ)?
Yes
Check if the fan is blocked
due to foreign objects or the motor
shaft is rusty?
Yes
Other errors occur at the
Same time? e.g. the IDU non-
synchronism protection (o7)
No
Fan drive board is
abnormal
GMV6 HR DC Inverter VRF Units Service Manual
No
Replace the fan
Yes
Clear the foreign
objects
Yes
The fan is damaged,
please replace the fan
Yes
Replace the fan drive board
196