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9-2. 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 fault site / faulty part may be
identified in the event of a fault 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 fault in consultation with the list.
• When investigating a fault on the basis of a display provided on the indoor remote controller or TCC-LINK central control remote controller -
See the “TCC-LINK remote controller or main remote controller display” section of the list.
• When investigating a fault on the basis of a display provided on an outdoor unit - See the “Outdoor 7-segment display” section of the list.
• When investigating a fault 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)
(Error detected by indoor unit)
Check code
Display of receiving unit
Typical fault site
Description of error
TCC-LINK
central control
or main remote
controller
display
Outdoor 7-segment display
Indicator light block
Sub-code
Flash
E03
–
–
Indoor-remote controller periodic
communication error
Communication from remote controller or network adaptor
has been lost (so has central control communication).
E04
–
–
Indoor-outdoor periodic communication
error
Signals are not being received from outdoor unit.
E08
E08 Duplicated indoor address
Duplicated indoor address
Indoor unit detects address identical to its own.
E10
–
–
Indoor inter-MCU communication error MCU communication between main controller and motor
microcontroller is faulty.
E18
–
–
Error in periodic communication
between indoor header and follower
unit
Periodic communication between indoor header and follower
units cannot be maintained.
F01
–
–
ALT Indoor heat exchanger temperature
sensor (TCJ) error
Heat exchanger temperature sensor (TCJ) has been open /
short-circuited.
F02
–
–
ALT Indoor heat exchanger temperature
sensor (TC2) error
Heat exchanger temperature sensor (TC2) has been open /
short-circuited.
F03
–
–
ALT Indoor heat exchanger temperature
sensor (TC1) error
Heat exchanger temperature sensor (TC1) has been open /
short-circuited.
F10
–
–
ALT Ambient temperature sensor (TA) error Ambient temperature sensor (TA) has been open / short-
circuited.
F11
–
–
ALT Discharge temperature sensor (TF)
error
Discharge temperature sensor (TF) has been open / short-
circuited.
F29
–
–
SIM P.C. board or other indoor error
Indoor EEPROM is abnormal (some other error may be
detected).
L03
–
–
SIM Duplicated indoor group outdoor unit
There is more than one outdoor unit in group.
L07
–
–
SIM Connection of group control cable to
stand-alone indoor unit
There is at least one stand-alone indoor unit to which group
control cable is connected.
L08
L08
–
SIM Indoor group address not set
Address setting has not been performed for one or more
indoor units (also detected at outdoor unit end).
L09
–
–
SIM Indoor capacity not set
Capacity setting has not been performed for indoor unit.
L20
–
–
SIM Duplicated central control address
There is duplication in central control address setting.
L30
L30 Detected indoor unit No.
SIM Indoor external error input (interlock)
Unit shutdown has been caused by external error input
(CN80).
P01
–
–
ALT Indoor AC fan error
Indoor AC fan error is detected (activation of fan motor
thermal relay).
P10
P10 Detected indoor unit No.
ALT Indoor overflow error
Float switch has been activated.
P12
–
–
ALT Indoor DC fan error
Indoor DC fan error (e.g. overcurrent or lock-up) is detected.
P31
–
–
ALT Other indoor unit error
Follower unit cannot be operated due to outdoor unit alarm
(E03 / L03 / L07 / L08).
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
: Lighting, : Flashing, : Goes off
ALT: Flashing is alternately when there are two flashing LED
SIM: Simultaneous flashing when there are two flashing LED
Operation Timer Ready
– 14 –
Troubleshooting for Demand Unit
Demand
P.C. board
is failed.
Exchange of transformer,
exchange of Demand
P.C. board
Exchange of
Demand
P.C. board
Fuse
F100 is melted.
NO
NO
YES
Exchange of transformer,
exchange of Demand
P.C. board
YES
Exchange of transformer
YES
Short-circuit is
found between 1 and 2
pins of connector connected to
CN102 of
transformer.
Take off wiring of
CN102. Short-circuit is
found between “~” and
“~” of DB100.
NO
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