Carrier 538FEQ009RBGA, Service Manual

Page: 41 / 94

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
If the resistance
value is 0
Remove PFC capacity
and test resistance of
two terminals
Capacity is
short
circuit and
replace it
Y
Re-energize
the unit and
start it
Cut the terminal of reactor,
test the resistance
between two terminals of
reactor with ohmic meter
Replace the
reactor
Re-
energize
the unit and
start it
Check the
connection wire
of reactor (L) of
outdoor unit and
PFC capacity
Is there damage or a
short circuit?
Replace
connection
wire with circuit
diagram
Replace
control board
AP1
Yes
Yes
No
No
Y
No
N
N
No
No
No
If there is damaged
short circuit
Does the unit
normally?
Does the unit
operate?
Y
Y
Y
End
Yes
Yes
Yes
Yes
operate
normally?
Does the unit
operate?
normally?
Fig. 44 – Troubleshooting