“P9” desynchronizing
protection for inverter
compressor
Compressor driver board
is faulted.
Yes
Replace the compressor
driver board.
No
Check if the UVW wires of
compressor are well connected?
Yes
No
Replace the
compresso
Check if the resistance value
between different windings of compressor
are normal
(the normal value is less than 2
ohm)
?
If
resistances of two windings are the same; if the insulation
atainst ground of different windings of compressor are
normal (the normal value is
less than 2 megohm
)?
Yes
Yes
Clear out foreign matter,
open the valves
Check if the system is blocked,
if the valves are open?
No
Check if the control
valve of system is in normal condition.
If the oil-balancing valve works normally, if the
control terminals are well inserted, etc.
If they are normal, please
see the next step;
Yes
If there are any other faults?
Such as compressor startup failure (PJ), IPM
module protection (P6), overcurrent protection of
compressor (P5).
Yes
The compressor is damaged,
please replace it.
Check if the
connecting order of UVW wires of
compressor is correct?
Yes
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