Toshiba MMU-AP0121MH - Manual (Page 79)

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Is there group cabling?
Check indoor P.C. board.
Failure ® Replace
There is individual indoor unit. Correct indoor group address.
Check setup item code
DN 12, 13, and 14 addresses.
Item code (D1) 12: Line address
Item code (D2) 13: Indoor address
Item code (D3) 14: Group address YES
YES
NO
NO
Check code name
[L07]
Check code name
Group line in individual indoor unit
Cause of operation
The group line is connected in the
individual indoor unit.
Turn on the power of indoor units.
Turn on the power of outdoor unit again.
Are powers of all the
indoor units turned on?
Disconnect connectors between
[U1, U2] and [U3, U4].
Clear addresses.
(Refer to “Address clear”.)
Re-execute address setup.
(Refer to “Address setup”.)
YES
NO
Check code name
[L08]
Check code name
Indoor group / address unset
Cause of operation
Indoor address unset
Note) This code is displayed when the power is turned on at the first time after installation.
(Because the address is not yet set up)
Set up capacity data of indoor unit.
(Setup item code (DN) = 11)
Check indoor P.C. board.
Defect Replace
Are capacity setups
of indoor units unset?
YES
NO
Check code name
[L10]
Check code name
Outdoor capacity unset
Cause of operation
On the outdoor IF P.C. board for service, the
model selecting jumper has not been set up so
as to match with the model.
I/F P.C. board A’ssy service for the outdoor unit is common to this series. A setup for model selection different from
that for P.C. board with trouble is necessary. Set up a model based upon the P.C. board A’ssy exchange procedure.
Check code name
[L09]
Check code name
Indoor capacity unset
Cause of operation
Indoor capacity unset
Check code name
[L17]
Check code name
Inconsistent models of
outdoor units
Cause of operation
There are outdoor units on the communication
line other than Super Module Multi Flex type
such as Super Module Multi or Super Module
Multi ice regenerative type
∗ Using 7-segment on I/F P.C. board, check the model name for each outdoor unit.
For check, when putting the rotary switch on SW01/02/03=16/16/16, it is an
outdoor I/F P.C. board for Super Module Multi Flex if “F” is displayed at the left
side of 7-segment [A] part.
Is the check code [L17]
displayed even if turning on again
power of all the connected outdoor
units on 1 system alone?
Are all the connected
outdoor I/F P.C. boards on 1 system
P.C. boards of outdoor units for
Super Module Multi Flex?
Check again whether there is any
other outdoor unit or not on the
communication line in 1 system.
If any, turn off power of the
corresponding outdoor unit and
then check once more.
Replace outdoor units of other models
with outdoor units purposed for flex.
Correct communication line between
outdoor units.
Change the incorrectly built-in outdoor
I/F P.C. boards with I/F boards for
Super Module Multi Flex.
Are the connected outdoor
units those for flex on 1 system?
(Check model name.)
YES
YES
YES
NO
NO
NO