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Troubleshooting
P.C. board or other indoor error
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
site/
part may be
identified in the event of a
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
in consultation with the list.
• When investigating a
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
on the basis of a display provided on an outdoor unit - See the “Outdoor 7-segment display” section of the list.
• When investigating a
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)
(
detected by indoor unit)
Check code
Display of receiving unit
Typical problem site
Description of Check code
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
E10
Indoor inter-MCU communication
error
Duplicated indoor address
Duplicated indoor address
Indoor unit detects address identical to its own.
MCU communication between main controller and
motor microcontroller is faulty.
E18
F01
F02
F03
F10
F11
Error in periodic communication
between indoor header and
follower unit
Periodic communication between indoor header
and follower units cannot be maintained.
–
–
Indoor heat exchanger
temperature sensor (TCJ) error
Heat exchanger temperature sensor (TCJ) has
been open/short-circuited.
–
–
Indoor heat exchanger
temperature sensor (TC2) error
Heat exchanger temperature sensor (TC2) has
been open/short-circuited.
–
–
Indoor heat exchanger
temperature sensor (TC1) error
Heat exchanger temperature sensor (TC1) has
been open/short-circuited.
–
–
temperature sensor
(TA
) error
temperature sensor (TA) has been
open/short-circuited.
–
–
Discharge
temperature
sensor (TF
) error
Discharge
temperature sensor (TF) has been
open/short-circuited.
–
–
–
–
Duplicated indoor group header
unit
There is more than one header unit in group.
–
–
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.
–
Indoor group address not set
Address setting has not been performed for one or
more indoor units (also detected at outdoor unit
end).
–
–
Indoor capacity not set
Capacity setting has not been performed for indoor
unit.
–
–
Duplicated central control address There is duplication in central control address
setting.
L30
Detected indoor unit No.
SIM
SIM
SIM
SIM
SIM
SIM
SIM
SIM
Indoor external error input
(interlock)
Unit shutdown has been caused by external error
input (CN80).
–
–
Indoor AC fan error
Indoor AC fan error is detected (activation of fan
motor thermal relay).
P10
P01
P12
P13
–
–
–
–
L30
P10 Detected indoor unit No.
ALT
ALT
ALT
Indoor overflow error
Float switch has been activated.
–
–
Indoor DC fan error
Indoor DC fan error (e.g. overcurrent or lock-up) is
detected.
–
–
Other indoor unit error
Follower unit cannot be operated due to header 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
TCC-LINK central
control or main
remote controller
display
ALT
ALT
ALT
ALT
ALT
ALT
ALT
Discharge
temperature sensor (TF) has been
open/short-circuited.
–
–
F17
–
–
F1
F29
L03
L07
L08
L08
L09
L20
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