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8-2. Troubleshooting Method
The remote controllers (main remote controller and central control remote controller) and the interface P.C. board
of an outdoor unit are provided with an LCD display (remote controller) or a 7-segment display (outdoor interface
P.C. board) to display operational status. Using this self-diagnosis feature, the problem site/problem part 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 controller or TCC-LINK central control remote controller -
See the "TCC-LINK remote control or main remote controller 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 controller-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 controller
display
E03
–
E04
–
E08
E08
D
u
i l p
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
–
P10
P10 Detected indoor unit No.
P
1
2
–
P
3
1
–
Display of receiving unit
Indicator light block
Operation Timer Ready
Sub-code
–
–
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 controller periodic
communication error
Indoor-outdoor periodic
communication error
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
error
Error in periodic communication
between indoor header and
follower unit
Indoor heat exchanger
A
L
T
temperature sensor (TCJ) error
Indoor heat exchanger
A
L
T
temperature sensor (TC2) error
Indoor heat exchanger
A
L
T
temperature sensor (TC1) error
Room air temperature sensor
A
L
T
(TA/TSA) error
Discharge air temperature
A
L
T
sensor (TF/TFA) error
Outside air suction temperature
ALT
sensor (TOA) error
Indoor air suction temperature
ALT
sen sor (TRA) error
I S
M
P.C. board or other indoor error
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 error input
SIM
(interlock)
A
L
T
Indoor AC fan error
ALT Indoor overflow error
A
L
T
Indoor DC fan error
A
L
T
Other indoor unit error
− 161 −
: Flashing,
: Goes off
Description of Check code
Communication from remote controller 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
o t
s t i
MCU communication between main controller 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 error
input (CN80).
Indoor AC fan error is detected (activation of fan
motor thermal relay).
Float switch has been activated.
Indoor DC fan error (e.g. overcurrent or lock-up) is
detected.
Follower unit cannot be operated due to header unit
alarm (E03/L03/L07/L08).
o
w
. n
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Troubleshooting
