Toshiba MMU-AP0091H service manual 151, L05, L03, L06

Check code Check code name Cause of operation

[H16] / [d7]	TK4 temperature detective circuit error	1.	Connection of TK4 sensor.
(TCC-L / AI-NET)	(Sub-code: 04)	2.	Error in resistance value of TK4 sensor
			(see 9-7 Sensor characteristics).
		3.	Check clogging and malfunction of

Check code Check code name Cause of operation

[L04] / [96] Duplicated setup of outdoor line address Outdoor line addresses are duplicated.

(TCC-L / AI-NET)

	SV3E valve circuit.
4.	Oil-equalization circuit error (check
	capillary clogging, strainer clogging).
5.	Refrigerant stagnation in case of
	compressor shell.

YES

Are there duplicate line address setups?

	NO
		NO
Are communication wire connections of
[U1.U2], [U3.U4], and [U5, U6] normal?

Correct the line address setup.

Correct the wire connection.

151

Has TK4 sensor become detached?

NO

Is there incorrect wiring or installation

on TK1/TK2/TK3/TK4 sensors?

NO

Are characteristics of TK4 sensor

resistance value normal?

YES

Does OCR of MG-SW operate?

NO

Check the clogging of SV3E valve.

(*1)

YES

YES

NO

YES

No error

*1 Refer to item [H07] error.

Correct installation of sensor.

Correct wiring/installation.

TK1: CN514

( TK2: CN515 )

TK3: CN516

TK4: CN523

Sensor error ÆReplace

Reset OCR manually.(*2)

Check I/F P.C. board

	YES
Check outdoor I/F P.C. board.		Repeat the address setup.
Failure ÆReplace		(Refer to “Address setup”.)

Check code	Check code name	Cause of operation
[L05] / [96]	Duplicated indoor units with priority	1. Two or more prior indoor units exist.
(TCC-L / AI-NET)	(Displayed on indoor unit with priority)

This check code is displayed on the set indoor unit when setup of indoor unit with priority is duplicated.

• Priority setup with two or more units is not available. Choose one prior unit in one refrigerant circuit system.

Error

Replace SV3E valve.

2If OCR operates even after manual reset of OCR, check whether the wiring to the current sensor (T02) of Comp-IPDU is correct or not.

Check the clogging of SV3E valve.

Check code	Check code name	Cause of operation
[L03] / [96]	Duplicated indoor header units	There were two or more indoor header
(TCC-L / AI-NET)		units within the same remote controller
		group.

1)	Check the connection of the remote controller after the connection has been changed.
2)	If the group configuration and address are normal when power has been turned on, the mode automatically shifts
	to address setup mode. (Re-setup of address) → Refer to “Address setup”.

Check code	Check code name	Cause of operation
[L06] / [96]	Duplicated indoor units with priority	Two or more indoor units with priority
(TCC-L / AI-NET)	(Displayed on the indoor unit other than	are duplicated.
	one with priority and on the outdoor unit)

Sub-code:No. of indoor units with priority

When indoor unit with priority is duplicated, this fault code is displayed on the unit other than the setup indoor unit and outdoor unit.

• As only one indoor unit with priority is valid, change the setup.