Toshiba MMU-AP0121MH - Manual (Page 78)

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Check code name
[H16]
Check code name
TK4 temperature detective circuit error
(Auxiliary code : 04)
Cause of operation
1. Detachment of TK4 sensor, miscabling,
characteristics error of resistance value
2. Check clogging and malfunction of
SV3E valve circuit.
3. Oil-equalization circuit error
(Check capillary clogging, strainer
clogging)
4. Refrigerant stagnation in compressor
shell
Is not TK4 sensor detached?
Is there no miscabling or misinstallation
on TK1/TK2/TK3/TK4 sensors?
Check the clogging of SV3E valve.
1 Refer to item [H07] error.
2 If OCR operates even after manual reset of OCR, check whether the wiring to the
current sensor (T02) of Comp-IPDU is correct or not.
Correct miscabling/misinstallation.
TK1: CN514
TK2: CN515
TK3: CN516
TK4: CN523 ( )
YES
YES
YES
NO
NO
NO
Replace SV3E valve.
Correct installation of sensor.
Are characteristics of TK4 sensor
resistance value normal?
Check the clogging of SV3E valve.
( 1)
Error
No error
Does OCR of MG-SW operate?
YES
NO
Reset OCR manually.( 2)
Sensor error Replace
Check I/F P.C. board
Check code name
[L03]
Check code name
Duplicated indoor header units
Cause of operation
There were two or more indoor header
units in some remote controller group
control.
1) Check the connection changing 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”.
YES
YES
NO
NO
Correct the line address setup.
Correct the cable connection.
Is there duplicated line address setup?
Are communication cable connections of
[U1.U2], [U3.U4], and [U5, U6] normal?
Check outdoor I/F P.C. board.
Failure Replace
Re-set up the address.
(Refer to “Address setup”.)
Check code name
[L04]
Check code name
Duplicated setup of outdoor line address
Cause of operation
Outdoor line addresses are duplicated.
Check code name
[L05]
Check code name
Duplicated indoor units with priority
(Displayed on indoor unit with priority)
Cause of operation
1. Two or more prior indoor units exist.
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.
Check code name
[L06]
Check code name
Duplicated indoor units with priority
(Displayed on the indoor unit other than
one with priority and on the outdoor unit)
Cause of operation
Two or more indoor units with priority
are duplicated.
Auxiliary code : No. of indoor units with priority
When indoor unit with priority is duplicated, this check 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.