Check code
Location
of
detection
Description
System status
Check code
detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
E08 E08
Duplicated indoor address
Indoor
unit
I/F
Duplicated
indoor address
All stop
More than one indoor unit
are
assigned same address.
• Check indoor addresses.
• Check for any change
made to remote controller
connection (group/
individual) since indoor
address setting.
E09 –
–
Remote
controller
Duplicated
master remote
controller
Stop of
corresponding
unit
In two remote controller
configuration (including
wireless), both controllers are
set up as master. (Header
indoor unit is shut down with
alarm, while follower indoor
units continue operating.)
• Check remote controller
settings.
• Check remote controller
P.C. boards.
E10 –
–
Indoor
unit
Indoor inter-
MCU
communication
trouble
Stop of
corresponding
unit
Communication cannot be
established/maintained upon
turning on of power or during
communication.
• Check for
trouble
in indoor
P.
C. board
E12 E12
I/F
Automatic
address starting
trouble
All stop
• Indoor automatic address
setting is started while
automatic address setting
for equipment in other
refrigerant line is in
progress.
• Outdoor automatic
address setting is started
while automatic address
setting for indoor units is in
progress.
• Perform automatic address
setting again after
disconnecting
communication cable to
that refrigerant line.
01:
Indoor-outdoor
communication
02:
Outdoor-outdoor
communication
E04/E06
E06
Indoor-outdoor
communication
circuit trouble
(E04)
Display on main remote
controller.
Indoor units unavailable for
indoor / outdoor
communication. :E04
Indoor units available for
indoor / outdoor
communication. : E06
All stop
Condition 1
One indoor unit or more
initially communicating
normally fails to return signal
for specified length of time.
Condition 2
Outdoor I / F board
SW09, Bit 4: ON
(To switch the check code
detection condition.)
• Check power supply to
indoor unit.
(Is power turned on?)
• Check indoor-outdoor
power-on sequence.
• Check indoor address
setting
• Check wiring of Indoor-
outdoor communication
wires
• Check outdoor terminator
resistor setting (SW30,
Bit 2).
No. of indoor
units from
which signal is
received
normally
I/F
Dropping out of
indoor unit (E06)
• Check power supply to
indoor unit.
(Is power turned on?)
• Check connection of
• indoor-outdoor
communication cable.
• Check connection of
communication connectors
on indoor P.C. board.
• Check connection of
communication connectors
on outdoor P.C. board.
• Check for
trouble
in indoor
P.
C. board.
• Check for
trouble
in outdoor
P.
C. board (I/F).
1
ON
2 3
SW09
4
Indoor
unit
– E07
–
I/F
Indoor-outdoor
communication
circuit
trouble
(detected at
outdoor end)
All stop
Signal cannot be transmitted
from outdoor to indoor units
for 30 seconds continuously.
• Check outdoor
terminator
resistor
setting (SW30,
Bit 2).
• Check connection of
indoor-outdoor
communication circuit.
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