IVT AE-X12GR-N Service Manual page 35

Status of Indication Malfunction
indoor/ by LED1 No. dis-
outdoor on out- played on
units door unit main unit
*2 display sec-
tion *1
Main
cate-
gory
Indoor/ 6 times 6
outdoor
units in
complete
shutdown
Indoor/ 7 times 7
outdoor
units in
complete
shutdown
Content of diagnosis
Sub- Main category Sub-category
cate-
gory
-0 Outdoor unit DC DC overcurrent error (1) IPM continuity check
-1 IPM pin level error
-0 Outdoor unit AC AC overcurrent error
-1 AC overcurrent error
in OFF status
-2 AC maximum cur-
rent error
-3 AC current defi-
ciency error
Inspection location/method
(2) Check the IPM and heat
sink for secure installation.
(3) Check the outdoor unit fan
motor for proper rotation.
(4) No abnormality found in
above inspections (1)
through (3).
(5) No abnormality found in
above inspections (1)
through (4).
Check the IPM is attached
correctly to the outdoor
unit control PWB.
(1) Check the outdoor unit air
outlet for blockage.
(2) Check the outdoor unit fan
for proper rotation.
(1) IPM continuity check
(1) Check the outdoor unit air
outlet for blockage.
(2) Check the outdoor unit fan
for proper rotation.
(1) Check if there is an open-
circuit in the secondary
winding of the current
transformer of the outdoor
unit control PWB.
(2) Check if the refrigerant
volume is abnormally low.
(3) Check if the refrigerant
flows properly.
3 – 15
AEX12GRN
Remedy
(1) Replace the outdoor
unit control PWB
assembly.
(2) Correct the installation
(tighten the screws).
(3) Replace the outdoor
unit fan motor.
(4) Replace the outdoor
unit control PWB
assembly.
(5) Replace the compres-
sor.
Replace the outdoor
unit control PWB
assembly.
(1) Ensure unobstructed
air flow from the out-
door unit air outlet.
(2) Check the outdoor unit
fan motor.
(1) Replace the outdoor
unit control PWB
assembly.
(1) Ensure unobstructed
air flow from the out-
door unit air outlet.
(1) Check the outdoor unit
fan motor.
(1) Replace the outdoor
unit control PWB
assembly.
(2) Charge the specified
amount of refrigerant.
(3) Correct refrigerant
clogs.
(2-way valve, 3-way
valve, pipe, expan-
sion valve)