Service manual

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Status of
indoor/outdoor
units
Indication by
LED1 on
outdoor unit
*2
Indication on indoor unit
Content of diagno
sis
Inspection location/method
Remedy
Floor / ceiling
Wall
(Panel)
Wall(Grill)
Lighting pattern at the time of timer lamp lighting
Main Sub
Main
for 5 seconds
Main category
Sub category
Indoor/outdoor units in operation
Normal flashing
Normal
_
_
_ _
_ _
Indoor/outdoor units incomplete shutdown
1 time
Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE)
Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED)
Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED)
Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED)
Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE)
Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE)
Operation lamp(RED) Cluster lamp(BLUE) Operation lamp(RED) Cluster lamp(BLUE)
Operation lamp(RED) Cluster lamp(BLUE)
Outdoor unit thermistor short-circuit
(1)Measure resistance
of the outdoor unit thermistors.
(TH2~4,6~9 : Approx.4.4 k at 25
C)
(2)Check the lead wire of the outdoor unit the
rmistor for torn sheath a
nd short-
circuit. (3)No abnormality found in above inspec
tions (1)and (2).
(1)Replace the outdoor unit thermistor assembly. (2)Replace the outdoor unit thermistor assembly. (3)Replace the outdoor unit control PCB assembly.
Indoor/outdoor units in complete
shutdown
2 time
Cycle temperature
(1)Check the outdo
or unit air outlet for bl
ockage.
(2)Check if the power supply voltage is 90 V
or higher at full power
.
(3)Check the pipe c
onnections for refrigeran
t leaks.
(4)Measure resistance
of the outdoor unit compr
essor thermistor.
(TH1:Approx.53 k at 25
C)
(5)Check the expansion valve for proper operation.
(1)Ensure unobstructed air flow from the outdo
or unit air outlet.
(2)Connect power supply of proper
voltage.
(3)Charge the specified amount of ref
rigerant.
(4)Replace the outdoor unit compressor the
rmistor assembly.
(5)Replace the expansion valve coil,expa
nsion valve or outdoor
unit control PCB
assembly.
Indoor unit in operation Outdoor unit in
temporary stop
(Temporary stop for cyc
le protection)
(Temporary stop for cyc
le protection)
(Temporary stop for cycle protection)
Temporary stop due to IPM overheat *3
(Temporary stop for pa
rts protection)
IPM high temperatur
e error (1)Measure resistance
of the heat-sink thermisto
r.(CN8B)
(1)Change the hea
t-sink thermistor.
Indoor/outdoor units in complete
shutdown
5 time
Outdoor unit
thermistor open- circuit
(1)Check connector C
N8A and CN8C of the outdoor unit thermistor for
secure
installation. (2)Measure resistance
of outdoor thermistors TH1~4,6~9.
(3)Check the lead wires of thermistors TH1~4,6~9 on the outdoor unit
control PCB for open-circuit.
(4)No abnormality found in above inspec
tions (1)through (3).
(1)Correct the installation. (2)Replace the out
door unit thermistor assembly.
(3)Replace the outdoor unit thermistor assembly. (4)Replace the outdoor unit control PCB assembly.
Indoor/outdoor units in
complete shutdown
6 time
Outdoor unit
DC Current
DC overcurrent error
(1)IPM continuity check
(2)Check the IPM and
heat sink for secure installation.
(3)Check the outdoor unit fan motor for prop
er rotation.
(4)No abnormality found in above inspec
tions (1)through (3).
(5)No abnormality found in above inspec
tions (1)through (4).
(1)Replace the outdoor unit control PCB assembly. (2)Correct the installation (tighten the screws).
Apply silicon grease.
(3)Replace the outdoor unit fan motor. (4)Replace the out
door unit control PCB assembly.
(5)Replace the compressor.
Indoor/outdoor units in complete shutdown
7 time
Outdoor unit AC Current
AC overcurrent error (1)Ensure unobstructed air flow from the outdo
or unit air outlet.
(2)Check the outdo
or unit fan motor.
(1)Ensure unobstructed air flow from the outdo
or unit air outlet.
(2)Check the outdo
or unit fan motor.
AC current error when OFF (1)IPM continuity check
(1)Replace the outdoor IPM PWB
AC maximum current err
or
(1)Ensure unobstruct
ed air flow from the outdoor unit air outlet.
(2)Check the outdo
or unit fan motor.
(1)Ensure unobstructed air flow from the outdo
or unit air outlet.
(2)Check the outdoor unit fan motor.
AC current deficiency error
(1)Replace the outdoor unit control PCB assembly.
(2)Charge the specified amount of ref
rigerant.
(3)Correct refrigerant clogs.
(Stop valve,pipe,expansion valve)
(1)Replace the outdoor unit control PCB assembly. (2)Charge the specified amount of refrigerant.
(3)Correct refrigerant clogs.
(Stop valve,pipe,expansion valve)
Indoor/outdoor units in complete shutdown
Abnormal wire check
Abnormal wire check error (1)Check the expansion valve. (un
itA-D)
(2)Are four expansio
n valves connected by mistake
(3)Check the wiring between units.
(1)Replace the outdoor control board assembly. (2)Reattach (3)Check the wiring between units.
Indoor/outdoor units in complete
shutdown
Outdoor unit
DC Fan
Outdoor unit DC fan rotation error (AE-XM30FR)
(1)Check connector CN3A of the outdoor unit DC fan motor fo
r secure installation.
(2)Check the outdo
or unit fan motor for proper rotation.
(3)Check fuse FUSE3. (4)Outdoor unit control PCB
(1)Correct the installation. (2)Replace the outdoor unit fan motor. (3)Replace the outdoor unit control PCB assembly. (4)Replace the outdoor unit control PCB assembly.
Flashes in 1-sec inte
rvals (normal) : 1sec ON / 1sec OFF
X ::
OFF : Flashes 3 times in 0.2-sec i
ntervals
8 time
11 time
X
Heat exchanger thermistor short circuit error Outdoor temperatureth
ermistor short-
circuit error
Suction thermistor sho
rt-circuit error
Thermistor Unit A
- D thermistor short-
circuit error Compressor high tem
perature error
Temporary stop due
to compressor dis
-
charge overheat *3
Temporary stop due to indoor unit
heat
exchanger overhea
t*3
Heat exchanger thermistor open-
circuit
error Outdoor temperature thermistor open- circuit error
Suction thermistor ope
n circuit error
Suction thermistor open circuit error Discharge thermistor o
pen-circuit error
Thermistor Unit A - D thermistor open- circuit error
Temporary stop due to
out door unit
heat exchanger overh
eat *3