Troubleshooting Method - Toshiba MMD-AP0186HP-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
AMP Air Conditioning
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
SIM
⎯
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
Indoor-remote controller periodic Communication from remote controller or network adaptor has
communication erro been lost (so has central control 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 motor
error microcontroller is faulty.
Error in periodic communication
Periodic communication between indoor header and follower units
between indoor header and
cannot be maintained.
follower unit
Indoor heat exchanger Heat exchanger temperature sensor (TCJ) has been open /
temperature sensor (TCJ) error shortcircuited.
Indoor heat exchanger Heat exchanger temperature sensor (TC2) has been open /
temperature sensor (TC2) error shortcircuited.
Indoor heat exchanger Heat exchanger temperature sensor (TC1) has been open /
temperature sensor (TC1) error shortcircuited.
Ambient temperature sensor (TA)
Ambient temperature sensor (TA) has been open / short-circuited.
error
Discharge temperature sensor Discharge temperature sensor (TF) has been open /
(TF) error shortcircuited.
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 which group control
to stand-alone indoor unit 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.
Duplicated central control address There is duplication in central control address setting.
Indoor external error input
Unit shutdown has been caused by external error input (CN80).
(interlock)
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).
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: Flashing, : Goes off
Description of error