Toshiba MMY-MAP0804FT7(Z), Service Manual, Page: 170 / 333

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IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
: Lighting, : Flashing, : Goes off
ALT.: Flashing is alternately when there are two flashing LED
SIM: Simultaneous flashing when there are two flashing LED
* Indicator light display of the receiving unit may be different from
those in the following table. (Wall type 3 series, etc.)
Check code Display of receiving unit
Typical fault site
Indoor-remote controller periodic
communication error
E03 — —
Communication from remote controller or network
adaptor has been lost (so has central control
communication).
Description of error
Outdoor 7-segment display TCC-LINK
central control
or main remote
controller
display
Indicator light block
Sub-code Flash
Ready Timer Operation
Periodic communication between indoor header
and follower units cannot be maintained.
E18 — —
Error in periodic communication
between indoor header and
follower unit
Indoor-outdoor periodic
communication error
E04 — —
Signals are not being received from outdoor unit.
Duplicated indoor group header
unit
L03 SIM — — There is more than one header unit in group.
Indoor heat exchanger
temperature sensor (TCJ) error Heat exchanger temperature sensor (TCJ) has
been open/short-circuited.
F01 ALT — —
Indoor heat exchanger
temperature sensor (TC2) error Heat exchanger temperature sensor (TC2) has
been open/short-circuited.
F02 ALT — —
Indoor external error input
(interlock) Unit shutdown has been caused by external error
input (CN80).
L30 SIM L30 Detected indoor unit No.
Outside air suction temperature
sensor (TOA) error Open/Short of outside air suction temperature sensor
(TOA) was detected.
F17 ALT — —
Indoor air suction temperature
sensor (TRA) error Open/Short of indoor air suction temperature sensor
(TRA) was detected.
F18 ALT — —
Indoor heat exchanger
temperature sensor (TC1) error Heat exchanger temperature sensor (TC1) has
been open/short-circuited.
F03 ALT — —
Ambient temperature sensor
(TA/TSA) error Ambient temperature sensor (TA) has been open/
short-circuited.
F10 ALT — —
Discharge temperature sensor
(TF) error Discharge temperature sensor (TF) has been open/
short-circuited.
F11 ALT — —
Outdoor unit model unmatched
error In case that outdoor unit model is different
(Not corresponded)
L02 SIM L02 —
Indoor EEPROM is abnormal (some other error may
be detected).
Connection of group control cable
to stand-alone indoor unit There is at least one stand-alone indoor unit to
which group control cable is connected.
L07 SIM — —
F29 SIM
P.C. board or other indoor error
— —
Address setting has not been performed for one or
more indoor units (also detected at outdoor unit end).
L08 SIM Indoor group address not set L08 —
Indoor AC fan error is detected (activation of fan
motor thermal relay).
P01 ALT Indoor AC fan error — —
Indoor DC fan error (e.g. overcurrent or lock-up) is
detected.
P12 ALT
Indoor DC fan error
— —
Follower unit cannot be operated due to header unit
alarm (E03/L03/L07/L08).
P31 ALT
Other indoor unit error
— —
Capacity setting has not been performed for indoor
unit.
L09 SIM
Indoor capacity not set
— —
Indoor inter-MCU communication
error MCU communication between main controller and
motor microcontroller is faulty.
E10 — —
Duplicated indoor address
E08 E08
Duplicated indoor address Indoor unit detects address identical to its own.
Indoor overflow error P10 P10 ALT Detected indoor unit No. Float switch has been activated.
Duplicated central control address
— L20 SIM —
There is duplication in central control address setting.
8-2. Troubleshooting Method
The remote controllers (main remote controller and central control remote controller) and the interface P.C.
board of an outdoor unit are provided with an LCD display (remote controller) or a 7-segment display (outdoor
interface P.C. board) to display operational status. Using this self-diagnosis feature, the fault site/faulty part may
be identified in the event of a fault by following the method described below.
The list below summarizes check codes detected by various devices. Analyze the check code according to
where it is displayed and work out the nature of the fault in consultation with the list.
• When investigating a fault on the basis of a display provided on the indoor remote controller or TCC-LINK
central control remote controller - See the “TCC-LINK remote control or main remote controller display”
section of the list.
• When investigating a fault on the basis of a display provided on an outdoor unit - See the “Outdoor 7-
segment display” section of the list.
• When investigating a fault on the basis of a wireless remote controller-controlled indoor unit - See the “Light
sensor indicator light block” section of the list.
List of Check Codes (Indoor Unit)
(Error detected by indoor unit)
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