Nobu NBL4-09IDU32 Service Manual page 59

Service Manual
(7) Power factor correct or (PFC) fault (a fault of outdoor unit) (AP1 hereinafter 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:
Start
Check wiring of the
reactor (L) of the
outdoor unit and the
PFC capacitor
Whether there is any
damage or
short-circuit?
No
Remove the PFC capacitor
and measure resistance
between the two terminals.
Is the resistance around zero?
No
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?
No
Replace the control
panel AP1
End
Installation and Maintenance
94
Replace it as per the
Yes wiring diagram and
reconnect the wires
The capacitor is
Yes
short circuited and
the capacitor
should be repla-
ced
Yes
Replace the reactor
If the fault is eliminated?
No
Restart the unit If the fault is eliminated?
No
Restart the unit If the fault is eliminated?
No
Service Manual
Yes
Yes
Yes
Installation and Maintenance
55