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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
Check the code
Header
displayed on the
unit 7-
indoor remote
segment
controller
display
L08
E08
-XXX Duplication of indoor addresses (address number in
Alternate
blinking
E04
E07
E06
E16
E16.XX
E23
E23
E25
E25
E26
-XX
E26
Alternate
blinking
L04
L04
L05(*)
L06
L06(*)
None
L08
L08
* "L05": Displayed on the indoor unit set up with priority
"L06": Displayed on the indoor units except the one set up with priority
Cause
When outdoor power is off
Address setup trouble
• 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.
• 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).
the subcode of the check code are duplicated).
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)
Transmission circuit trouble at the interface side
(P.C. board failure)
After address setup, communication from all the
indoor units is interrupted under the condition that a
normal operation can be performed.
Exceeded the number or capacity of connected
indoor units
• The setting of terminator resistor is incorrect.
• Communication with outdoor unit from
another refrigerant line cannot be performed
when power is turned on (Uh(U3/U4)
communication line).
Duplication of outdoor addresses (only when an
outdoor address was manually set up)
Number of connected outdoor units has decreased. Correction of the cause of trouble occurrence
• When installing an outdoor backup
• The power of a follower unit is not turned on.
Duplication of outdoor line addresses
• Line address setup trouble (occurred after
connection between U1/U2 and U3/U4
connectors)
Duplication of indoor units with priority
There are two or more indoor units set up with
priority.
Address setup trouble
• Only indoor addresses of all the connected indoor
units are undefined.
Check that the header outdoor unit power is on
Set up the address again.
Set up the address again.
Check SW100 bit 1 or bit 2 of the header unit.
ON
No connection between multiple refrigerant lines:
1
2
Turn off SW100 bit 1 and turn on bit 2.
Connection between multiple refrigerant lines:
SW100
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.
Replace the interface PC board.
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.
Adjust the number or capacity of connected indoor
units.
• Check the connection of Uh (U3/U4)
communication line.
• Check whether there is defect or not on
outdoor unit interface P.C.board.
• Check the setting of terminator resistor.
Do not use manual setup for outdoor addresses.
• 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.
Modify the line address setup of the header unit
between lines. (Set up SW13 and SW14 on the
interface PC board.)
Set up priority only for one indoor unit.
Among indoor units indicating "L05," set one unit
with priority.
Set up the addresses again.
Modify the setup.
- 154 -
Countermeasures
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Table of Contents
Troubleshooting
