Gree GMV5 Series Service Manual page 170

(7) Low voltage protection for the DC bus of the variable-frequency compressor's drive board (ODU fault
PL)
(8) Variable-frequency compressor starting failure (ODU fault PJ)
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
PL
Check if the voltage of the
whole system's input power
cable is lower than 320V.
No
The compressor's drive
board is faulty and needs to
be replaced.
Complete
PJ
Restart the system five
minutes after shutting down it
to see if the failure is solved.
No
Check if the compressor's
UVW cable is connected
properly.
Yes
Replace the compressor's
drive board to see if the
failure is solved.
No
The compressor is faulty
and needs to be replaced.
Complete
Yes
No
167
Elevate the voltage of
the input power cable
to 380 V.
Reconnect the
compressor's UVW
cable.