Toshiba MMD-AP0724H2UL Service Manual page 46

9-2. 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)
Check code
Outdoor 7-segment display
TCC-LINK central
control or main remote
controller display
Sub-c ode
E03 –
E04 –
E08 E08 Duplicated indoor address
E10 –
E18 –
F01 –
F02 –
F03 –
F10 –
F11 –
F29 –
L03 –
L07 –
L08 L08
L09 –
L20 –
L30 L30 Detected indoor unit No.
P01 –
P31 –
All manuals and user guides at all-guides.com
Display of receiving unit
Indicator light block
Operation Timer Ready
Flash
–
–
–
–
– ALT
– ALT
– ALT
– ALT
– ALT
– SIM P.C. board or other indoor error
– SIM
– SIM
– SIM Indoor group address not set
– SIM Indoor capacity not set
– SIM Duplicated central control address
SIM
– ALT Indoor AC fan error
– ALT Other indoor unit error
– 46 –
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
: Lighting, : Flashing,
ALT.: Flashing is alternately when there are two flashing LED
SIM: Simultaneous flashing when there are two flashing LED
Typical fault site
Communication from remote controller or network
Indoor-remote controller periodic
adaptor has been lost (so has central control
communication error
communication).
Indoor-outdoor periodic
Signals are not being received from outdoor unit.
communication error
Duplicated indoor address Indoor unit detects address identical to its own.
Indoor inter-MCU communication MCU communication between main controller and
error motor microcontroller is faulty.
Error in periodic communication
Periodic communication between indoor header
between indoor header and
and follower units cannot be maintained.
follower unit
Indoor heat exchanger Heat exchanger temperature sensor (TCJ) has
temperature sensor (TCJ) error been open/short-circuited.
Indoor heat exchanger Heat exchanger temperature sensor (TC2) has
temperature sensor (TC2) error been open/short-circuited.
Indoor heat exchanger Heat exchanger temperature sensor (TC1) has
temperature sensor (TC1) error been open/short-circuited.
Ambient temperature sensor (TA) Ambient temperature sensor (TA) has been open/
error short-circuited.
Discharge temperature sensor Discharge temperature sensor (TF) has been open/
(TF) error short-circuited.
Indoor EEPROM is abnormal (some other error may
be detected).
Duplicated indoor group header
There is more than one header unit in group.
unit
Connection of group control cable There is at least one stand-alone indoor unit to
to stand-alone indoor unit which group control cable is connected.
Address setting has not been performed for one or
more indoor units (also detected at outdoor unit
end).
Capacity setting has not been performed for indoor
unit.
There is duplication in central control address
setting.
Indoor external error input Unit shutdown has been caused by external error
(interlock) input (CN213)
Indoor AC fan error is detected (activation of fan
motor thermal relay).
Follower unit cannot be operated due to header unit
alarm (E03/L03/L07/L08).
: Goes off
Description of error