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12

Troubleshooting

 Confirmation and check
When a problem occurred in the air conditioner, the
check code and indoor UNIT No. appear on the display
part of the remote controller.
The check code is only displayed during the operation.
If the display disappears, operate the air conditioner
according to the following "Confirmation of check code"
for confirmation.
Check code
Indoor UNIT No. in which
a problem occurred
 Confirmation of check code
When a problem occurred on the air conditioner, the
check code can be confirmed with the following
procedure. (The check code is stored in memory up to
4 check codes.)
The check code can be confirmed from both operating
status and stop status.
2
3
1
When
and
buttons are pushed
simultaneously for 4 seconds or more, the
following display appears.
If
is displayed, the mode enters in the check
code mode.
• [01: Order of check code] is displayed in CODE
No..
• [Check code] is displayed in CHECK.
• [Indoor unit address in which a problem
occurred] is displayed in Unit No..
129-EN
2
Every pushing of
button used to set
temperature, the check code stored in
memory is displayed in order.
The numbers in CODE No. indicate CODE No.
[01] (latest)  [04] (oldest).
REQUIREMENT
Do not push
button because all the check code of the
indoor unit will be deleted.
3
After confirmation, push
to the usual display.
1
– 65 –
 Check codes and parts to be checked
Wired
Wireless remote controller
remote
Sensor block display of
controller
receiving unit
display
Operation Timer
Indication
Ready
GR GR OR
E01
E02
button to return
E03
E04
E08
E09
E10
E11
E18
E31
F01
F02
F04
F06
F07
F08
F10
Judging
Main defective parts
Parts to be checked / trouble description
device
Flashing
Incorrect remote controller setting --- The header
No header remote
remote controller has not been set (including two
controller
remote controllers).
Remote
controller
Remote controller
communication
No signal can be received from the indoor unit.
trouble
Indoor / outdoor connecting wires, indoor P.C. board,
Remote controller
Remote
remote controller
transmission trouble
controller
--- No signal can be sent to the indoor unit.
Indoor unit-remote
Remote controller, network adapter, indoor P.C.
controller regular
Indoor
board --- No data is received from the remote
communication
controller or network adapter.
trouble
Indoor unit-outdoor
unit serial
communication
Indoor / outdoor connecting wires, indoor P.C. board,
trouble
Indoor
outdoor P.C. board --- Serial communication trouble
between indoor unit and outdoor unit
IPDU-CDB
communication
trouble
Duplicated indoor
Indoor address setting trouble --- The same address
Indoor
addresses
as the self-address was detected.
Remote controller address setting trouble --- Two
remote controllers are set as header in the double-
Duplicated header
Remote
remote controller control.
remote controllers
controller
(* The header indoor unit stops raising alarm and
follower indoor units continue to operate.)
CPU-CPU
Indoor P.C. board --- Communication trouble between
communication
Indoor
main MCU and motor microcomputer MCU
trouble
Communication
trouble between
Communication trouble between Application control
Indoor
Application control kit
kit and Indoor unit
and Indoor unit
Header unit follower
Indoor P.C. board --- Regular communication is not
unit regular
Indoor
possible between header and follower indoor units or
communication
between twin header (main) and follower (sub) units.
trouble
IPDU communication
Outdoor
Communication trouble between IPDU and CDB
trouble
Indoor unit heat
Heat exchanger sensor (TCJ), indoor P.C. board ---
ALT
exchanger sensor
Indoor
Open-circuit or short-circuit of the heat exchanger
(TCJ) trouble
sensor (TCJ) was detected.
Indoor unit heat
Heat exchanger sensor (TC), indoor P.C. board ---
ALT
exchanger sensor
Indoor
Open-circuit or short-circuit of the heat exchanger
(TC) trouble
sensor (TC) was detected.
Outdoor unit
Outdoor temp. sensor (TD), outdoor P.C. board ---
ALT
discharge temp.
Outdoor
Open-circuit or short-circuit of the discharge temp.
sensor (TD) trouble
sensor was detected.
Outdoor unit temp.
Outdoor temp. sensors (TE / TS), outdoor P.C. board
ALT
sensor (TE / TS)
Outdoor
--- Open-circuit or short-circuit of the heat exchanger
trouble
temp. sensor was detected.
TL sensor may be displaced, disconnected or short-
ALT
TL sensor trouble
Outdoor
circuited.
Outdoor unit outside
Outdoor temp. sensor (TO), outdoor P.C. board ---
ALT
air temp. sensor
Outdoor
Open-circuit or short-circuit of the outdoor air temp.
trouble
sensor was detected.
Indoor unit room
Room temp. sensor (TA), indoor P.C. board --- Open-
ALT
temp. sensor (TA)
Indoor
circuit or short-circuit of the room temp. sensor (TA)
trouble
was detected.
Air
conditioner
status
*
*
Auto-
reset
Auto-
reset
Auto-
reset
*
Auto-
reset
Entire
stop
Auto-
reset
Entire
stop
Auto-
reset
Auto-
reset
Entire
stop
Entire
stop
Entire
stop
Operation
continued
Auto-
reset
130-EN

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