L07 Group line in individual indoor unit

Check code name

Cause of operation

[L07]	Group line in individual indoor unit	The group line is connected in the
		individual indoor unit.

Check code name	Check code name	Cause of operation

[L10]	Outdoor capacity unset	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.

YES

Is there group cabling?

Check indoor P.C. board.

Failure ÆReplace

Check setup item code

DN 12, 13, and 14 addresses.

YES

There is individual indoor unit.

Item code (D1) 12: Line address

Item code (D2) 13: Indoor address

Item code (D3) 14: Group address

Correct indoor group address.

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	Check code name	Cause of operation

[L17]	Inconsistent models of	There are outdoor units on the communication
	outdoor units	line other than Super Module Multi Flex type
		such as Super Module Multi or Super Module
		Multi ice regenerative type

Check code name	Check code name	Cause of operation

[L08]	Indoor group / address unset	Indoor address unset

Are the connected outdoor	NO
units those for flex on 1 system?
units those for flex on 1 system?
(Check model name.)

Replace outdoor units of other models with outdoor units purposed for flex.

Are powers of all the		NO
indoor units turned on?
	YES
	YES

Disconnect connectors between

[U1, U2] and [U3, U4].

Turn on the power of indoor units.

Turn on the power of outdoor unit again.

	YES

Is the check code [L17]		NO
displayed even if turning on again		NO
displayed even if turning on again
power of all the connected outdoor
units on 1 system alone?
	YES
	YES

Correct communication line between outdoor units.

Clear addresses. (Refer to “Address clear”.)

Re-execute address setup. (Refer to “Address setup”.)

Are all the connected			NO
Are all the connected				Change the incorrectly built-in outdoor
outdoor I/F P.C. boards on 1 system				Change the incorrectly built-in outdoor
outdoor I/F P.C. boards on 1 system				I/F P.C. boards with I/F boards for
P.C. boards of outdoor units for				I/F P.C. boards with I/F boards for
P.C. boards of outdoor units for				Super Module Multi Flex.
Super Module Multi Flex?				Super Module Multi Flex.
Super Module Multi Flex?
	YES




Check again whether there is any		∗ Using 7-segment on I/F P.C. board, check the model name for each outdoor unit.
other outdoor unit or not on the

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)

Check code name	Check code name	Cause of operation

[L09]	Indoor capacity unset	Indoor capacity unset

communication line in 1 system.	For check, when putting the rotary switch on SW01/02/03=16/16/16, it is an
If any, turn off power of the	outdoor I/F P.C. board for Super Module Multi Flex if “F” is displayed at the left
corresponding outdoor unit and	side of 7-segment [A] part.
then check once more.

Are capacity setups		YES
of indoor units unset?
	NO
	NO

Set up capacity data of indoor unit.

(Setup item code (DN) = 11)

Check indoor P.C. board.

Defect Replace

MMU-AP0181MH, MMU-AP0071MH, MMU-AP0091MH, MMU-AP0151MH, MMU-AP0121MH specifications

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In conclusion, the Toshiba MMU-AP series offers a blend of efficiency, adaptability, and advanced technology, making it a valuable asset for various industrial and commercial applications. Its intelligent design and robust features ensure that users can optimize energy use while maintaining high performance and reliability.

Toshiba MMU-AP0121MH, MMU-AP0181MH L07 Group line in individual indoor unit, L10, L17, L08, L09

Models: MMU-AP0181MH MMU-AP0071MH MMU-AP0091MH MMU-AP0151MH MMU-AP0121MH

[L07]

Group line in individual indoor unit

[L10]

[L17]

outdoor units

[L08]

Indoor group / address unset

Indoor address unset

[L09]

Indoor capacity unset

MMU-AP0181MH, MMU-AP0071MH, MMU-AP0091MH, MMU-AP0151MH, MMU-AP0121MH specifications