Troubleshooting Method; List Of Check Codes (Indoor Unit) - Toshiba MMD-AP0076BHP1-E Service Manual

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 controller 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
TCC-LINK
Outdoor 7-segment display
central control
or main remote
Sub-code
controller
display
⎯ ⎯
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
P10 P10 Detected indoor unit No.
⎯ ⎯
P12
⎯ ⎯
P31
Display of receiving unit
Indicator light block
Operation
Timer Ready
Flash
Indoor-remote controller periodic
communication erro
Indoor-outdoor periodic
communication error
Duplicated indoor address
Indoor inter-MCU communication
error
Error in periodic communication
between indoor header and
follower unit
Indoor heat exchanger
ALT
temperature sensor (TCJ) error
Indoor heat exchanger
ALT
temperature sensor (TC2) error
Indoor heat exchanger
ALT
temperature sensor (TC1) error
Ambient temperature sensor (TA)
ALT
error
Discharge temperature sensor
ALT
(TF) error
SIM P.C. board or other indoor error
Duplicated indoor group header
SIM
unit
Connection of group control cable
SIM
to stand-alone indoor unit
SIM Indoor group address not set
SIM Indoor capacity not set
SIM Duplicated central control address There is duplication in central control address setting.
Indoor external error input
SIM
(interlock)
ALT Indoor AC fan error
ALT Indoor overflow error
ALT Indoor DC fan error
ALT Other indoor unit error
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
: Lighting,
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 adaptor has
been lost (so has central control communication).
Signals are not being received from outdoor unit.
Indoor unit detects address identical to its own.
MCU communication between main controller and motor
microcontroller is faulty.
Periodic communication between indoor header and follower units
cannot be maintained.
Heat exchanger temperature sensor (TCJ) has been open /
shortcircuited.
Heat exchanger temperature sensor (TC2) has been open /
shortcircuited.
Heat exchanger temperature sensor (TC1) has been open /
shortcircuited.
Ambient temperature sensor (TA) has been open / short-circuited.
Discharge temperature sensor (TF) has been open /
shortcircuited.
Indoor EEPROM is abnormal (some other error may be detected).
There is more than one header unit in group.
There is at least one stand-alone indoor unit to 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.
Unit shutdown has been caused by external error input (CN80).
Indoor AC fan error is detected (activation of fan motor thermal
relay).
Float switch has been activated.
Indoor DC fan error (e.g. overcurrent or lock-up) is detected.
Follower unit cannot be operated due to header unit alarm (E03 /
L03 / L07 / L08).
– 54 –
: Flashing, : Goes off
Description of error