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9-2. Troubleshooting method
The remote controllers (main remote controller and central control device) 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 trouble site / trouble part may be
identified in the event of a trouble 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 trouble in consultation with the list.
• When investigating a trouble on the basis of a display provided on the indoor remote controller or central
control device - See the “central control device or main remote controller display” section of the list.
• When investigating a trouble on the basis of a display provided on an outdoor unit - See the “Outdoor 7-
segment display” section of the list.
• When investigating a trouble on the basis of a wireless remote controller-controlled indoor unit - See the
“Indicator light block” section of the list.
Check code
Typical trouble on site Description of check code
Remote
controller
display
Outdoor 7-segment display
Sub-code
Indoor unit (including Hot Water Module)
List of check codes (indoor unit)
(Check code detected by indoor unit)
A01 Flow switch operation troubleDetected indoor nuit No. When water flow rate is reduced.
A01
A04 Activation of water heat exchanger frost protectionDetected indoor nuit No. Frost protection for water heat exchanger is activated.
A04
E08 Duplicated indoor address
Duplicated indoor address
Indoor unit detects address identical to its own.
E08
E03
Indoor-remote controller periodic communication
check code
—
Communication from remote controller or network adaptor
has been lost (so has central control communication).
—
E10 Communication trouble between indoor unit MCU—
Communication trouble between main MCU and the motor
microcomputer MCU.
—
E11
Communication check code between Application
control kit and indoor unit
—
Communication check code between Application control
kit and indoor unit P.C. board.
—
E18
Check cod in periodic communication between
indoor header and follower unit
—
Periodic communication between indoor header and
follower units cannot be maintained.
—
F01
Indoor heat exchanger temperature sensor (TCJ)
check code
—
Heat exchanger temperature sensor (TCJ) has been open
/ short-circuit.
—
F02
Indoor heat exchanger temperature sensor (TC2)
check code
—
Heat exchanger temperature sensor (TC2) has been open
/ short-circuit.
—
F03
Indoor heat exchanger temperature sensor (TC1)
check code
—
Heat exchanger temperature sensor (TC1) has been open
/ short-circuit.
—
F10 Ambient temperature sensor (TA) check code—
Ambient temperature sensor (TA) has been open /
short-circuit.
—
F11 Discharge temperature sensor (TF) check code—
Discharge temperature sensor (TF) has been open /
short-circuit.
—
F19
Indoor heat exchanger temperature sensor
(TCJ2 (TF)) trouble
—
Heat exchanger temperature sensor (TCJ2 (TF)) has been
open / short-circuited.
—
F25 Water inlet temperature sensor (TWI (TA)) trouble—
Water inlet temperature sensor (TWI (TA)) has been
open / short-circuited.
—
F26
Water outlet temperature sensor (TWO (TC2))
trouble
—
Water outlet temperature sensor (TWO (TC2)) has been
open / short-circuited.
—
F29 P.C. board or other indoor check code—
Indoor EEPROM is abnormal (some other trouble may be
detected).
—
F30 Occupancy sensor trouble— Occupancy sensor trouble has been detected.
—
L03 Duplicated indoor group header unit— There is more than one header unit in group.
—
L07
Connection of group control cable to a single indoor
unit
—
There is at least one a single indoor unit to which group
control cable is connected.
—
L08 Indoor group address not set—
Address setting has not been performed for one or more
indoor units (also detected at outdoor unit end).
L08
L09 Indoor capacity not set— Capacity setting has not been performed for indoor unit.
—
L20 Duplicated central control address— There is duplication in central control address setting.
—
L30 Indoor external check code input (interlock)Detected indoor unit No.
Unit shutdown has been caused by external check code
input (CN080).
L30
P01 Indoor AC fan check code—
Indoor AC fan check code is detected (activation of fan
motor thermal relay).
—
P10 Indoor overflow check codeDetected indoor unit No. Float switch has been activated.
P10
P12 Indoor DC fan check code—
• Indoor DC fan check code (e.g. overcurrent or lock-up)
is detected.
—
P31 Other indoor unit check code—
Follower unit cannot be operated due to header unit alarm
(E03 /L03 / L07 / L08).
—
E04 Indoor-outdoor periodic communication check code— Signals are not being received from outdoor unit.
—
A02 Water temperature decrease troubleDetected indoor nuit No.
Water temperature continued the low status regardless of
that the heater pump is operating.
A02
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