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Check code
[E20] / [42]
(TCC-L / AI-NET)
Check code name
Unit connected to other line
during automatic address
Cause of operation
When starting automatic indoor address, a
device in another refrigerant system is
connected.
Sub-code: 01: Connection of outdoor of another system 02: Connection of indoor unit of another system
Separate the wire between systems according to address setup method.
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
Did power failure occur?
Is there no noise source, etc?
Is there miscabling or
disconnection on communication line
between outdoor units?
Is the terminal resistance
between outdoor units turned on?
(SW30 Bit 1)
Is connection of CN03 connector
on outdoor I/F P.C. board normal?
Check outdoor I/F P.C. board.
Defect Replace
Is main power of
outdoor unit turned off?
Check and eliminate noise, etc
Clear fault code.
Turn the terminal resistance to ON.
Turn on main power of outdoor unit.
Correct wiring of cable connector.
Correct communication line.
Check code
[E23] / [15]
(TCC-L / AI-NET)
Check code name
Communication sending error
between outdoor units
Cause of operation
1. Interconnection cable error between outdoor
unit
2. Communication error between outdoor units,
I/F P.C. board error
3. Terminal resistance setup error between
outdoor units
YES
YES
YES
YES
NO
NO
NO
NO
Is outdoor unit setting 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?
Correct connection.
(Communication connector: CN03)
Check I/F P.C. board.
Clear the error and then start operation. ( 1)
Turn on the main power supply.
Correct connection of communication line.
Check code
[E26] / [15]
(TCC-L / AI-NET)
Check code name
Decrease of connected
outdoor units
Cause of operation
1. Outdoor unit backup setup
2. Outdoor power error
3. Communication line connection error between
outdoor units
4. Connector error for communication
5. Outdoor I/F P.C. board error
Sub-code: No. of outdoor units which received signals normally
(
∗∗
∗∗
∗1) How to clear the error
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 code
[E25] / [15]
(TCC-L / AI-NET)
Check code name
Duplicated address setup of termi-
nal outdoor units
Cause of operation
Addresses are duplicated by manual setting of
outdoor address
Never set up the outdoor address manually.
Check code
[E28] / [d2]
(TCC-L / AI-NET)
Check code name
Terminal outdoor unit error
Cause of operation
Terminal unit error
Sub-code: Detected outdoor unit number
An error occurred on the terminal unit. Confirm the check code of the terminal unit using 7-segment display on the
I/F P.C. board of the terminal unit and check it according to the diagnostic procedure for each fault code.
How to identify the terminal outdoor unit on which error occurred
Under condition that [E28] is displayed on the 7-segment display on the header unit, when pushing SW04 for 1
second or more, the fan on the faulty outdoor unit will rotate. Pushing SW05 alone, stops the fan rotation.