No
Yes
No
No
Yes
Yes
Yes
No
No
Yes
No
Yes
[E23]
esuaCedoc kcehC Check code name
Communication signal
sending trouble between
outdoor units
1.
Inter-unit wire connection trouble between outdoor units
2. Communication connector connection trouble
between outdoor units, I/F P.C. board trouble
3. End terminal resistance setup trouble between
outdoor units
Is connection
of CN03 connector on
outdoor I/F P.C. board
normal?
Is not main power of
outdoor unit turned
off?
Did power failure
occur?
Is there no noise
source, etc?
Is the
terminator resistor between
outdoor units turned on?
(SW30 Bit 2)
Is there no
miswiring or disconnection
on communication line
between outdoor
units?
Correct communication line.
Correct wiring or connector.
Turn on main power of
outdoor unit.
Turn the terminator resistor
to ON.
Clear check code.
Check and eliminate noise,
etc
Check outdoor I/F P.C. board.
Faiure Replace
− 169 −
Do not set up outdoor addresses manually.
[E25]
No
Yes
No
Yes
No
Yes
No
Yes
[E26]
Sub-code: Address of the outdoor unit receiving signal abnormally
[E28]
Sub-code: Detected outdoor unit No.
Check code
CauseCheck code
Check code
Check code name
Duplicated follower outdoor
address setup
Cause
Addresses are duplicated by manual setup of outdoor
address
Check code name
Follower outdoor unit trouble
Cause
Trouble has occurred on a follower outdoor unit.
Check code name
Decrease of connected outdoor
units
1. Outdoor unit backup setup
2. Outdoor power trouble
3. Communication line connection trouble
between outdoor units
4. Communication connector connection trouble
5. Outdoor I/F P.C. board trouble
During setup of outdoor
unit backup?
Is main power of
follower unit turned on?
Is
communication line
between outdoor
units connected
normally?
Is communication
connector (CN03)
between follower outdoor
units connected?
Clear the trouble, and then
start operation. (*1)
Turn on the main power supply.
Correct connection of
communication line.
Correct connector connection.
(Communication connector: CN03)
(*1) How to clear the trouble
Set SW01/SW02/SW03 on I/F P.C. board of header unit to 2/16/1, and
push SW04 for 5 seconds or more.
(7-segment display: [Er.] [CL])
Check I/F P.C. board.
A trouble occurred on a follower unit. See the check code on the 7-segment display on I/F P.C. board of the follower
unit, and then check it according to diagnose procedure for the check code.
(How to specify the follower outdoor unit in which trouble occurred)
Push SW04 for 1 second or more under condition that [E28] is displayed on the 7-segment display of the header
unit. The fan of the outdoor unit which stopped due to occurrence of trouble starts rotating. Push SW05 to stop the
fan.
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