Gree GMVVQ1015WM/C-X, Service Manual

Page: 211 / 433

Gree GMV6 HR DC Inverter VRF Units Service Manual
209
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 operat
es improperly.
Troubleshooting:
"PJ" Inve rte r Compressor
Startup Fa ilure
The co mpr essor drive
boa rd o perates impr operly
Yes
Replace th e compre ssor
drive boar d
No
Whether th e U, V and W
pha ses of compressor wire s are
connected prope rly?
Yes
No
Replace th e
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 forei gn matters
and op en the valve
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))?
Yes
The co mpr essor is
damag ed and sh ould be
repl ace d
Whether th e U, V and W
pha ses of compressor
wires a re con nected pro perly?
Yes