"P5" Inve rter Compressor
Over-current Protection
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 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 balan ce valve
operates normally and whether the 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 loss of synchronization
for the compressor (P9))?
Yes
The compressor is
damag ed and should be
replaced
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