Gree GMV-VQ680WM/C-X Service Manual page 211

Gree
If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is PJ, it
indicates the inverter compressor startup failure.
Possible causes:
■ Poor contact of compressor's UVW cables;
■ The compressor is damaged;
■ The compressor drive board operates improperly.
Troubleshooting:
normal (generally less than 2 ohms)? Whether the resistance
values are equal to each other? Is grounding insulation of the
"PJ" Inve rte r Compressor
Startup Fa ilure
Whether th e U, V and W
pha ses of compressor wire s are
connected prope rly?
Yes
Whether th e U, V and W
pha ses of compressor
wires a re con nected pro perly?
Yes
Whether the resistance between
the windings of each phase for the compressor is
phase windings of the compressor normal
(generally greater than 2 megohms)?
Yes
Whether th e system is clogged
and whether the valve is op en?
Yes
whether th e system con trol valve
is n ormal (for e xa mpl e, whether balan ce valve
ope rate s normall y and whether th e control
terminal is plu gged prop erly)?
Yes
Whether other faults have
occurred at the same time (for example, loss
of synchronization for the compressor (P9), IPM
module protection (P6) and compressor
over-current protection (P5))?
No
The co mpr essor drive
boa rd o perates impr operly
GMV6 HR DC Inverter VRF Units Service Manual
No
Yes
Remove forei gn matters
and op en the valve
The co mpr essor is
Yes
damag ed and sh ould be
Yes
Replace th e compre ssor
drive boar d
209
Replace th e
compresso r
repl ace d