Gree GMV-400WM/G-X

Gree GMV6 DC Inverter VRF Units Service Manual
174
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:
"PJ" Inverte r Compressor
Startup Failure
The compressor drive
board o perates improperly
Yes
Replace the compre ssor
drive boar d
No
Whether the U, V and W
phases of compressor wire s are
connected properly?
Yes
No
Replace the
compresso r
Whether the resistance between
the windings of each phase for the compressor is
normal (generally less than 2 ohms)? Whether the resistance
values are equal to each other? Is grounding insulation of the
phase windings of the compressor normal
(generally greater than 2 megohms)?
Yes
Yes
Remove foreign matters
and open the valve
Whether the system is clogged
and whether the valve is op en?
Yes
whether the system con trol valve
is n ormal (for example, whether balance valve
operates normall y and whether th e control
terminal is plugged prop erly)?
Yes
Whether other faults have
occurred at the same time (for ex am p le , loss
of synchronization for the compressor (P9), IPM
module protection (P6) and compressor
over-current protection (P5))?
Yes
The compressor is
damag ed and should be
replaced
Whether the U, V and W
phases of compressor
wires are connected properly?
Yes