AYXP26FRN
3 – 15
Indoor/
outdoor
units in
complete
shutdown
6 times 6 -0 Outdoor unit
DC¨
DC overcurrent error (1) IPM continuity check (1) Replace the outdoor
unit control PWB
assembly.
(2) Check the IPM and heat
sink for secure installa-
tion.
(2) Correct the installa-
tion (tighten the
screws).
(3) Check the outdoor unit
fan motor for proper rota-
tion.
(3) Replace the outdoor
unit fan motor.
(4) No abnormality found in
above inspections (1)
through (3).
(4) Replace the outdoor
unit control PWB
assembly.
(5) No abnormality found in
above inspections (1)
through (4).
(5) Replace the com-
pressor.
Indoor/
outdoor
units in
complete
shutdown
7 times 7 -0 Outdoor unit
AC¨
AC overcurrent error (1) Check the outdoor unit air
outlet for blockage.
(1) Ensure unobstructed
air flow from the out-
door unit air outlet.
(2) Check the outdoor unit
fan for proper rotation.
(2) Check the outdoor
unit fan motor.
-1 AC overcurrent error
in OFF status
(1) IPM continuity check (1) Replace the outdoor
unit control PWB
assembly.
-2 AC maximum cur-
rent error
(1) Check the outdoor unit air
outlet for blockage.
(1) Ensure unobstructed
air flow from the out-
door unit air outlet.
(2) Check the outdoor unit
fan for proper rotation.
(1) Check the outdoor
unit fan motor.
-3 AC current defi-
ciency error
(1) Check if there is an open-
circuit in the secondary
winding of the current
transformer of the out-
door unit control PWB.
(1) Replace the outdoor
unit control PWB
assembly.
(2) Check if the refrigerant
volume is abnormally low.
(2) Charge the specified
amount of refrigerant.
(3) Check if the refrigerant
flows properly.
(3) Correct refrigerant
clogs.
(2-way valve, 3-way
valve, pipe, expan-
sion valve)
Indoor/
outdoor
units in
complete
shutdown
9 times 9 -0 Outdoor unit
cooling/heating
switchover
Thermistor installa-
tion error or 4-way
valve error
(1) Check to make sure out-
door unit thermistor TH2
(heat exchanger) and
TH5 (2-way valve) are
installed in correct posi-
tions.
(1) Correct the installa-
tion.
(2) Measure resistance of
thermistors TH1 and
TH5.
(2) Replace the ther-
mistor assembly.
(3) Check the 4-way valve for
proper operation.
(3) Replace the 4-way
valve.
(4) No abnormality found in
above inspections (1)
through (3).
(4) Replace the outdoor
unit control PWB
assembly.
Status of
indoor/
outdoor
units
Indication
by LED1 on
outdoor
unit *2
Malfunction
No. dis-
played on
main unit
display sec-
tion *1
Content of diagnosis Inspection location/method Remedy
Main
cate-
gory
Sub-
cate-
gory
Main category Sub-category
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