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8-2. Troubleshooting Method
The remote controls (main remote control and central control remote control) and the interface P.C. board of an
outdoor unit are provided with an LCD display (remote control) or a 7-segment display (outdoor interface P.C.
board) to display operational status. Using this self-diagnosis feature, the problem may be identified in the
event of a problem by following the method described below.
The list below summarizes check codes detected by various devices. Analyze the check code according to
where it is displayed and work out the nature of the problem in consultation with the list.
• When investigating a problem on the basis of a display provided on the indoor remote control or TCC-LINK
central control remote control - See the "TCC-LINK remote control or main remote control display" section of
the list.
• When investigating a problem on the basis of a display provided on an outdoor unit - See the "Outdoor 7-
segment display" section of the list.
• When investigating a problem on the basis of a wireless remote control-controlled indoor unit - See the "Light
sensor indicator light block" section of the list.
List of Check Codes (Indoor Unit)
(Check code detected by indoor unit)
Check code
Outdoor 7-segment display
TCC-LINK central
control or main
remote control
display
E03
–
E04
–
E08
E08
D
E10
–
E18
–
F
0
1
–
F
0
2
–
F
0
3
–
F
1
0
–
F
1
1
–
F17
–
F18
–
F
2
9
–
L
0
3
–
L
0
7
–
L
0
8
L
0
8
L
0
9
–
L
2
0
–
L30
L30
Detected indoor unit No.
P
0
1
–
P
3
1
–
Display of receiving unit
Indicator light block
Operation Timer Ready
Sub-code
–
–
u
i l p
a c
e t
i d
d n
o o
a r
d d
e r
s s
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
: Lighting,
ALT.: Flashing is alternately when there are two flashing LED
SIM: Simultaneous flashing when there are two flashing LED
Typical problem site
Flash
Indoor-remote control periodic
communication trouble
Indoor-outdoor periodic
communication trouble
D
u
i l p
a c
e t
i d
d n
o o
a r
d d
e r
s s
Indoor inter-MCU communication
trouble
Trouble in periodic communication
between indoor header and
follower unit
Indoor heat exchanger
A
L
T
temperature sensor (TCJ) trouble
Indoor heat exchanger
A
L
T
temperature sensor (TC2) trouble
Indoor heat exchanger
A
L
T
temperature sensor (TC1) trouble
Room air temperature sensor
A
L
T
(TA/TSA) trouble
Discharge air temperature
A
L
T
sensor (TF/TFA) trouble
Outside air suction temperature
ALT
sensor (TOA) trouble
Indoor air suction temperature
ALT
sen sor (TRA trouble
I S
M
P.C. board or other indoor trouble
Duplicated indoor group header
I S
M
unit
Connection of group control cable
I S
M
to stand-alone indoor unit
I S
M
Indoor group address not set
I S
M
Indoor capacity not set
I S
M
Duplicated central control address
Indoor external trouble input
SIM
(interlock)
A
L
T
Indoor AC fan trouble
A
L
T
Other indoor unit trouble
– 48 –
: Flashing,
: Goes off
Description of Check code
Communication from remote control or network
adaptor has been lost (so has central control
communication).
Signals are not being received from outdoor unit.
n I
o d
r o
u
i n
d t
t e
c e
s t
a
d d
e r
s s
d i
n e
c i t
l a
MCU communication between main control and
motor microcontroller is faulty.
Periodic communication between indoor header
and follower units cannot be maintained.
Heat exchanger temperature sensor (TCJ) has
been open/short-circuited.
Heat exchanger temperature sensor (TC2) has
been open/short-circuited.
Heat exchanger temperature sensor (TC1) has
been open/short-circuited.
Room air temperature sensor (TA) has been
open/short-circuited.
Discharge air temperature sensor (TF) has been
open/short-circuited.
Open/Short of outside air suction temperature
sensor (TOA) was detected.
Discharge air temperature sensor (TF) has been
open/short-circuited.
Open/Short of indoor air suction temperature
sensor (TRA) was detected.
There is more than one header unit in group.
There is at least one stand-alone indoor unit to
which group control cable is connected.
Address setting has not been performed for one or
more indoor units (also detected at outdoor unit
end).
Capacity setting has not been performed for indoor
unit.
There is duplication in central control address
setting.
Unit shutdown has been caused by external
trouble input (CN080).
Indoor AC fan trouble is detected (activation of fan
motor thermal relay).
Follower unit cannot be operated due to header unit
alarm (E03/L03/L07/L08).
o t
s t i
o
w
. n
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Troubleshooting
