7-5. Troubleshooting in Test Operation
If there are phenomena such as the output of a check code or the remote controller is not accepted when
poweredon after wiring work or during address setup operation, the following causes are considered.
7-5-1. A Check Code is Displayed on the Remote Controller
* “L05”: Displayed on the indoor unit set up with priority
“L06”: Displayed on the indoor units except the one set up with priority
Check the code
displayed on the
indoor remote
controller
Header
unit 7-
segment
Cause Countermeasures
display
When outdoor power is off Check that the header outdoor unit power is on
Address setup trouble
Set up the address again.
• Only line addresses of the connected indoor units
are undefined.
The outdoor line address and the line addresses
of all the indoor units do not match.
•
L08
E08
-XX Duplication of indoor addresses (address number in
the subcode of the check code are duplicated).
Set up the address again.
Alternate
blinking
When the terminator resistor (SW100 bit2)
in the communication line between indoor
and outdoor units (Uv) on the outdoor unit
has not been turned on or two or more
terminator resistors have been turned on
(After address setup, when terminator resistor
setup is changed after powering-on)
Check SW100 bit 1 or bit 2 of the header unit.
No connection between multiple refrigerant lines:
Turn off SW100 bit 1 and turn on bit 2.
Connection between multiple refrigerant lines:
Turn on SW100 bit 1 of only the connected header
unit for one line.
Turn on SW100 bit2 of all the header units.
*Factory default : SW100 bit 1 is off, bit 2 is off.
E04
ON
1 2
SW100
E07
Transmission circuit trouble at the interface side
(P.C. board failure)
Replace the interface PC board.
After address setup, communication from all the
indoor units is interrupted under the condition that a
normal operation can be performed.
Check and correct disconnection of the indoor/
outdoor communication line (the communication line
between the header unit and the leading indoor
unit).
Check for the influence of communication noise.
In TU2C-LINK communication system, if the
termination resistance is not set in any of the
indoor units.
E06
E16
-XX Exceeded the number or capacity of connected
indoor units
Adjust the number or capacity of connected indoor
units.
E16
Alternate
blinking
E23 E23
Communication between outdoor units has stopped. Check the number of connected outdoor units.
Check that outdoor unit power is on.
E25 E25
Duplication of outdoor addresses (only when an
outdoor address was manually set up)
Do not use manual setup for outdoor addresses.
Number of connected outdoor units has decreased.
Correction of the cause of trouble occurrence
E26 -XX
E26
Alternate
blinking
Duplication of outdoor line addresses Modify the line address setup of the header unit
between lines. (Set up SW13 and SW14 on the
interface PC board.)
L04 L04
L05(*) L06 Duplication of indoor units with priority Set up priority only for one indoor unit.
L06(*) None
There are two or more indoor units set up with
priority.
Among indoor units indicating “L05,” set one unit
with priority.
Address setup trouble
Set up the addresses again.
Modify the setup.
L08 L08
• The indoor addresses are duplicated. (Units
except those displaying E04 are duplicated.)
• A header unit is not set up in group control (except
groups displaying E04).
• When installing an outdoor backup
• The power of a follower unit is not turned on.
• If it occurs when installing a backup, clear the
trouble after setup finishes.
•
If the power of a follower unit is not turned on, turn
on the power.
• Line address setup trouble (occurred after
connection between U1/U2 and U3/U4
connectors)
• Only indoor addresses of all the connected indoor
units are undefined.
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