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OM_D0X7303301-01_EN_Print.book Page 126 Friday, May 19, 2023 6:48 PM
Check codes and parts to be checked
Wired
Wireless remote controller
remote
Sensor block display of
controller
receiving unit
display
Main defective parts
Operation Timer
Ready
Indication
Flashing
GR GR OR
No header remote
controller
E01
Remote controller
communication
trouble
Remote controller
E02
transmission trouble
Indoor unit-remote
controller regular
E03
communication
trouble
Indoor unit-outdoor
unit serial
communication
trouble
E04
IPDU-CDB
communication
trouble
Duplicated indoor
E08
addresses
Duplicated header
E09
remote controllers
CPU-CPU
E10
communication
trouble
Communication
trouble between
E11
Application control kit
and Indoor unit
Header unit follower
unit regular
E18
communication
trouble
IPDU communication
E31
trouble
Indoor unit heat
F
0
1
A
L
T
exchanger sensor
(TCJ) trouble
Indoor unit heat
F
0
2
A
L
T
exchanger sensor
(TC) trouble
Outdoor unit
F
0
4
A
L
T
discharge temp.
sensor (TD) trouble
Outdoor unit temp.
F
0
6
A
L
T
sensor (TE / TS)
trouble
F
0
7
A
L
T
T
L
s
e
n
s
o
t r
o r
u
b
e l
Outdoor unit outside
F
0
8
A
L
T
air temp. sensor
trouble
Indoor unit room
F
1
0
A
L
T
temp. sensor (TA)
trouble
35-EN
Air
Judging
Parts to be checked / trouble description
conditioner
device
status
Incorrect remote controller setting --- The header
remote controller has not been set (including two
remote controllers).
Remote
*
controller
No signal can be received from the indoor unit.
Indoor / outdoor connecting wires, indoor P.C. board,
Remote
remote controller
*
controller
--- No signal can be sent to the indoor unit.
Remote controller, network adapter, indoor P.C.
Auto-
Indoor
board --- No data is received from the remote
reset
controller or network adapter.
Indoor / outdoor connecting wires, indoor P.C. board,
Auto-
Indoor
outdoor P.C. board --- Serial communication trouble
reset
between indoor unit and outdoor unit
Indoor address setting trouble --- The same address
Auto-
Indoor
as the self-address was detected.
reset
Remote controller address setting trouble --- Two
remote controllers are set as header in the double-
Remote
remote controller control.
*
controller
(* The header indoor unit stops raising alarm and
follower indoor units continue to operate.)
Indoor P.C. board --- Communication trouble between
Auto-
Indoor
main MCU and motor microcomputer MCU
reset
Communication trouble between Application control
Entire
Indoor
kit and Indoor unit
stop
Indoor P.C. board --- Regular communication is not
Auto-
Indoor
possible between header and follower indoor units or
reset
between twin header (main) and follower (sub) units.
Entire
Outdoor
Communication trouble between IPDU and CDB
stop
Heat exchanger sensor (TCJ), indoor P.C. board ---
Auto-
Indoor
Open-circuit or short-circuit of the heat exchanger
reset
sensor (TCJ) was detected.
Heat exchanger sensor (TC), indoor P.C. board ---
Auto-
Indoor
Open-circuit or short-circuit of the heat exchanger
reset
sensor (TC) was detected.
Outdoor temp. sensor (TD), outdoor P.C. board ---
Entire
Outdoor
Open-circuit or short-circuit of the discharge temp.
stop
sensor was detected.
Outdoor temp. sensors (TE / TS), outdoor P.C. board
Entire
Outdoor
--- Open-circuit or short-circuit of the heat exchanger
stop
temp. sensor was detected.
TL sensor may be displaced, disconnected or short-
Entire
O
u
d t
o
r o
circuited.
stop
Outdoor temp. sensor (TO), outdoor P.C. board ---
Operation
Outdoor
Open-circuit or short-circuit of the outdoor air temp.
continued
sensor was detected.
Room temp. sensor (TA), indoor P.C. board --- Open-
Auto-
Indoor
circuit or short-circuit of the room temp. sensor (TA)
reset
was detected.
Wired
Wireless remote controller
remote
Sensor block display of
controller
receiving unit
display
Main defective parts
Operation Timer
Indication
Ready
Flashing
GR GR OR
F
1
2
A
L
T
T
S
s
e
n
s
o
t r
o r
Heat sink sensor
F
1
3
A
L
T
trouble
Temp. sensor
F
1
5
A
L
T
connection trouble
Indoor unit, other P.C.
F
2
9
I S
M
board trouble
Occupancy sensor
F
3
0
I S
M
trouble
Outdoor unit P.C.
F
3
1
I S
M
board
Outdoor unit
H01
compressor
breakdown
Outdoor unit
H02
compressor lock
Outdoor unit current
H03
detect circuit trouble
Case thermostat
H04
operation
Outdoor unit low-
H06
pressure system
trouble
Duplicated header
L
0
3
I S
M
indoor units
Group line in
L
0
7
I S
M
individual indoor unit
Indoor group address
L
0
8
I S
M
not set
Indoor unit capacity
L
0
9
I S
M
not set
Outdoor unit P.C.
L
1
0
I S
M
board
LAN communication
L
2
0
I S
M
trouble
Other outdoor unit
L
2
9
I S
M
trouble
Abnormal external
L
3
0
I S
M
input into indoor unit
(interlock)
Phase sequence
L
3
1
I S
M
trouble, etc.
P
0
1
A
L
T
n I
d
o
r o
u
n
t i
a f
Outdoor unit
P
0
3
A
L
T
discharge temp.
trouble
– 126 –
Judging
Parts to be checked / trouble description
device
TS sensor may be displaced, disconnected or short-
u
b
e l
O
u
d t
o
r o
circuited.
Abnormal temperature was detected by the temp.
Outdoor
sensor of the IGBT heat sink.
Outdoor
Temp. sensor (TE / TS) may be connected incorrectly.
Indoor
Indoor P.C. board --- EEPROM trouble
Indoor
Abnormality was detected from occupancy sensor.
Outdoor P.C. board ---- In the case of EEPROM
Outdoor
trouble.
Current detect circuit, power voltage --- Minimum
frequency was reached in the current releasing
Outdoor
control or short-circuit current (Idc) after direct
excitation was detected
Outdoor
Compressor circuit --- Compressor lock was detected.
Current detect circuit, outdoor unit P.C. board ---
Outdoor
Abnormal current was detected in AC-CT or a phase
loss was detected.
Outdoor
Malfunction of the case thermostat
Current, high-pressure switch circuit, outdoor P.C.
Outdoor
board --- Pressure sensor trouble was detected or
low-pressure protective operation was activated.
Indoor address setting trouble --- There are two or
Indoor
more header units in the group.
Indoor address setting trouble --- There is at least one
Indoor
group-connected indoor unit among individual indoor
units.
Indoor address setting trouble --- Indoor address
Indoor
group has not been set.
Indoor
Indoor unit capacity has not been set.
In the case of outdoor P.C. board jumper wire (for
Outdoor
service) setting trouble
Network
Address setting, central control remote controller,
adapter
network adapter --- Duplication of address in central
central
control communication
control
Other outdoor unit trouble
1) Communication trouble between IPDU MCU and
Outdoor
CDB MCU
2) Abnormal temperature was detected by the heat
sink temp. sensor in IGBT.
External devices, outdoor unit P.C. board ---
Indoor
Abnormal stop due to incorrect external input into
CN80
Power supply phase sequence, outdoor unit P.C.
Outdoor
board --- Abnormal phase sequence of the 3-phase
power supply
Indoor fan motor, indoor P.C. board --- Indoor AC fan
n
t
o r
u
b
e l
n I
d
o
r o
trouble (fan motor thermal relay activated) was
detected.
An trouble was detected in the discharge temp.
Outdoor
releasing control.
Air
conditioner
status
Entire
stop
Entire
stop
Entire
stop
Auto-
reset
Operation
continued
Entire
stop
Entire
stop
Entire
stop
Entire
stop
Entire
stop
Entire
stop
Entire
stop
Entire
stop
Entire
stop
Entire
stop
Entire
stop
Auto-
reset
Entire
stop
Entire
stop
Entire
stop
Operation
continued
(thermost
at OFF)
Entire
stop
Entire
stop
36-EN
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