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AYXP7FR
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 installation.
(2) Correct the installa-
tion (tighten the
screws).
(3) Check the outdoor unit fan
motor for proper rotation.
(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 compres-
sor.
-1 IPM pin level error Check the IPM is attached
correctly to the outdoor
unit control PWB.
Replace the outdoor
unit control PWB
assembly.
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 outdoor
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 positions.
(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.
-3 Torque control error (1) Check if the refrigerant
volume is abnormally low.
(1) Change the specified
amount of refrigerant.
(2) Check the 4-way valve for
proper operation.
(2) Replace the 4-way
valve.
(3) check to see compressor
type is correct.
(3) Replace the compres-
sor with the correct
part.
Status of
indoor/
outdoor
units
Indication
by LED1
on out-
door unit
*2
Malfunction
No. dis-
played on
main unit
display sec-
tion *1
Content of diagnosis Inspection location/method Remedy
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