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Check code
Typical fault site
Description of error
A01
A01 Detected indoor nuit No.
Flow switch operation error
When water flow rate is reduced.
E10
—
—
Indoor inter-MCU communication
error
MCU communication between main controller and motor
microcontroller is faulty.
E08
E08 Duplicated indoor address
Duplicated indoor address
Indoor unit detects address identical to its own.
A04
A04 Detected indoor nuit No.
Activation of water heat
exchanger frost protection
Frost protection for water heat exchanger is activated
E18
—
—
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 /
shortcircuited.
—
—
F01
F26
—
—
Indoor heat exchanger
temperature sensor (TC2) error
Heat exchanger temperature sensor (TC2) has been open /
shortcircuited.
F03
—
—
Indoor heat exchanger
temperature sensor (TC1) error
Heat exchanger temperature sensor (TC1) has been open /
shortcircuited.
F19
—
—
Indoor heat exchanger
temperature sensor (TF) error
Heat exchanger temperature sensor (TF) has been open /
shortcircuited.
F25
—
—
Indoor heat exchanger
temperature sensor (TA) error
Heat exchanger temperature sensor (TA) has been open /
shortcircuited.
F29
—
—
P.C. board or other indoor error
Indoor EEPROM is abnormal (some other error may be detected).
L03
—
—
Duplicated indoor group header
unit
There is more than one header unit in group.
L07
—
—
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
—
Indoor group address not set
Address setting has not been performed for one or more indoor
units (also detected at outdoor unit end).
L09
—
—
Indoor capacity not set
Capacity setting has not been performed for indoor unit.
L30
L30 Detected indoor unit No.
Indoor external error input
(interlock)
Unit shutdown has been caused by external error input (CN80).
P31
—
—
Other indoor unit error
Follower unit cannot be operated due to header unit alarm (E03 /
L03 / L07 / L08).
L20
—
—
Duplicated central control address There is duplication in central control address setting.
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.
A02
A02 Detected indoor nuit No.
Water temperature decrease
error
Water temperature continued the low status regardless of that
the heater pump is operating.
TCC-LINK
central control
or main remote
controller
display
Outdoor 7-segment display
Sub-code
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
Indoor unit (including Hot Water Module)
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 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)