Sub-code: 00: No header unit 02: Two or more header units
No
Yes
Yes
Are not
communication lines
(U1, U2) between indoor
and outdoor connected
to multiple outdoor
units?
No
If the outdoor power is turned on ahead, the check code [E19:00] is displayed until the indoor power is turned on.
However it is not an error. When the indoor power will be turned on, the check code [E19:00] will be automatically
disappeared.
Connect communication line
between indoor and outdoor.
[E19]
[E20]
No
No
No
No
No
No
[E23]
Header outdoor unit quantity error
1. Misconnection of inter-unit wire between indoor
and outdoor
2. Outdoor I/F P.C. board error
Unit connected to other line
during automatic address
Is
communication
line between indoor and
outdoor connected to
one unit per 1
system?
Is
connectionof CN03
connector on outdoor
I/F P.C. board
normal?
Is there
nomiswiring or
disconnection on communication
lineg between outdoor
units?
Is not main power of
outdoor unit turned
off?
Did power failure
occur?
Is there no noise
source, etc?
Is the end
terminal resistance between
outdoor units turned on?
(SW30 Bit 1)
Connect communication line
between indoor and outdoor
to one unit per 1 system.
Turn on main power of
outdoor unit.
Correct wiring or connector.
Turn the end terminal
resistance to ON.
Clear check code.
Check and eliminate noise,
etc.
Check outdoor I/F P.C. board.
Defect → Replace
Reference)
The outdoor unit connected with communication wires (U1, U2) between
indoor and outdoor is automatically recognized as the header unit.
Check I/F board.
Separate the connection between the lines following the address setup method.
Check code name
Check code name
Cause
Cause
Check code name
Cause
Sub-code: 01: Connection of an outdoor unit in another line 02: Connection of an indoor unit in another line
When starting automatic indoor address, a device
in another line is connected.
Check code
Check codeCheck code
Yes
Communication signal sending
error between outdoor units
1. Inter-unit wire connection error between outdoor units
2. Communication connector connection error
between outdoor units, I/F P.C. board error
3. End terminal resistance setup error between
outdoor units
Yes
Yes
Yes
Yes
Yes
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