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Check code
Outdoor 7-segment display
Main
remote
controller
Check code Sub-code
AI-NET
central control
remote controller
Detected
position
Check code name Status Error detection condition Check item (position)
E12 E12 01: Indoor/outdoor
communication
02: Between outdoors
communication
42 I/F Automatic address start
error
All stop • When indoor automatic address started, other
refrigerant circuit system was setting automatic
address.
• When outdoor automatic address started, indoor
automatic address was executed.
• Setup the address again after disconnecting communication
connection with other refrigerant circuit system.
E15 E15 — 42 I/F No correspondin
g
indoor
unit during automatic
address
All stop Indoor unit is not found when indoor automatic address
start was set up.
• Check the communication line connection between indoor and
outdoor.
• Check the electric power line error in indoor.
• Check the noise of surrounding devices.
• Power failure
• Check indoor P.C. board error.
E16 E16 00: Capacity over
01 to: No. of connected
units
89 I/F No. of connected indoor
units / Capacity over
All stop • Total capacity of indoor units exceeded 135% of total
outdoor capacity.
• No. of connected indoor units are more than 48 units.
[Note]
If this code appears after backup setup of outdoor unit
trouble, set up “No. capacity-over detection”.
Setup method of “No. capacity-over detection”
Turn on SW09/Bit 2 on I/F P.C. board of outdoor header
unit.
• Check the connection capacity of indoor unit.
• Check the HP capacity of indoor unit.
• Check the indoor/outdoor capacity setup
• Check the No. of connected indoor units.
• Check the outdoor I/F P.C. board error
E18 —— 97, 99 Indoor
unit
Communication error
between indoor header
and follower units
Correspondin
g
unit only stops.
Regular communication between indoor header and
follower units
• Check cable of the remote controller.
• Check power cabling of indoor.
• Check P.C. board of indoor.
E19 E19
00: No header unit
02: Two or more header
units
96 I/F Outdoor unit quantity
error
All stop
• There are multiple outdoor units in 1 line.
• There is none of outdoor unit in 1 line.
The outdoor unit connected with communication cable between
indoor and outdoor (U1.U2) is the outdoor unit.
• Check connection of communication line between indoor and
outdoor.
• Check outdoor P.C. board(I/F) error.
E20 E20 01: Connection of
outdoor of other line
02: Connection of indoor
of other line
42 I/F Other line unit
connected during
automatic address
All stop Unit of other line was connected when indoor automatic
address started.
Separate the cable between lines according to automatic
address setup method in “Address setup”.
E23 E23 — 15 I/F Communication sending
error between outdoor
units
All stop Transmission of other outdoor unit was unavailable for
30 seconds or more.
In this model, onl
y
one outdoor unit is provided to one refri
g
erant
line. Be sure to check there is no communication connection
with outdoor unit in the other refrigerant line.
E25 E25 — 15 I/F Duplicated outdoor
follower address setup
All stop Outdoor addresses manually set up are duplicated.
Note)
Do not set up the outdoor address manually.
E26 E26 No. of normally received
outdoor units
15 I/F Decreased number of
connected outdoor units
All stop The signal was not returned for constant from the
outdoor unit which was receiving signal.
In this model, onl
y
one outdoor unit is provided to one refri
g
erant
line. Be sure to check there is no communication connection
with outdoor unit in the other refrigerant line.
Outdoor header unit received error code from outdoor
follower unit.
• Check the check code of outdoor follower unit.E28 E28 No. of detected outdoor
units
d2 I/F Outdoor follower unit
error
All stop
Convenient functions
When pushing SW04 for 1 second or more under condition that [E28] is displayed on 7-segment display of
outdoor header unit, the fan of outdoor unit which stopped abnormally starts rotating.
If pushing SW04 and SW05 simultaneously, the fan of normal outdoor unit operates.
When pushing SW05 singly, the operation of fan is cleared.
Convenient functions