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Troubleshooting
Diagram 14:
Power factor correct (PFC) fault P9 (a fault of outdoor unit) (AP1 here in after refers to the control board of the outdoor unit)
Mainly detect:
● Check if the reactor (L) of the outdoor unit and the PFC capacitor are broken.
Fault diagnosis process:
Y
Y
N
N
N
N
N
N
Y
Y
Y
Start
Check wiring of the
reactor (L) of the
outdoor unit and the
PFC capacitor
Whether there is any
damage or
short-circuit?
Replace it as per the
wiring diagram and
reconnect the wires
If the fault is eliminated?
Remove the PFC capacitor
and measure resistance
between the two terminals.
Is the resistance around zero?
The capacitor is
short circuited and
the capacitor
should be repla-
ced
Restart the unit
If the fault is eliminated?
Disconnect the terminals for the
reactor and measure the resistance
between the two terminals of the
reactor by an ohm gauge
Whether there is any damage
or short-circuit?
Replace the reactor
Restart the unit
If the fault is eliminated?
Replace the control
panel AP1
End
Y
