"P9" Loss of
Synchronization Pro tection
for the Inverter Compressor
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 wires are
connected prope rly?
Yes
No
Replace th e
compressor
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 th e system is clogged
and whether the valve is open?
Yes
whether the system control valve
is n ormal (for example, whether balance valve
operates normally and whether th e control
terminal is plugged prop erly)?
Yes
Whether other faults have
occurred at the same time (for example,
compressor startup failure (PJ), 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 a re con nected pro perly?
Yes
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