Carrier 619FB Service Manual page 41

8. PFC (correction for power factor) malfunction (outdoor unit malfunction) (AP1 below is control board of the outdoor unit).
Main detection point:
S Check if reactor (L) of outdoor unit and PFC capacity are damaged.
Malfunction diagnosis process:
Start
Check the
connection wire
of reactor (L) of
outdoor unit and
PFC capacity
Is there damage or a
short circuit?
No
Remove PFC capacity
and test resistance of
two terminals
If the resistance
value is 0
No
Cut the terminal of reactor,
test the resistance
between two terminals of
reactor with ohmic meter
If there is damaged
short circuit
No
Replace
control board
AP1
End
Replace
connection
Yes
wire with circuit
diagram
Capacity is
Re-energize
short
the unit and
Yes Y
circuit and
start it
replace it
Replace the
energize
Yes Y
reactor the unit and
start it
Fig. 44 – Troubleshooting
Does the unit
operate
normally?
No
Does the unit
operate?
normally?
No N
Re-
Does the unit
operate?
normally?
No N
41
Yes Y
Yes Y
Yes Y