Gree GMV-VQ680WM/C-X Service Manual page 207

Gree
"P8" IPM Over Temperature
Compressor Drive Boar d
Whether over-temperature
protection of IPM modul e is trig gered
The co mpr essor drive boar d
2.158 "P9" Loss of Synchronization Protection for Inverter
Compressor
Fault display: main board of outdoor unit displays
Fault diagnosis:
If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is P9, it
indicates the loss of synchronization protection for the inverter compressor.
Possible causes:
■ The compressor drive board operates improperly.
■ The compressor is damaged.
Troubleshooting:
Pro tection for the
upo n p owe r-on?
No
ope rate s imprope rly
GMV6 HR DC Inverter VRF Units Service Manual
Check whether th e screws are
No
tightened and whether the IPM
module is coa ted with thermal
Yes
Replace th e compre ssor drive
boa rd
205
grea se