Troubleshooting Method - Toshiba MMD-AP0726HP-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 trouble site / trouble
part may be identified in the event of a trouble 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 trouble in consultation with the list.
• When investigating a trouble 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 trouble on the basis of a display provided on an outdoor unit - See the "Outdoor 7-
segment display" section of the list.
• When investigating a trouble on the basis of a wireless remote controller-controlled indoor unit - See the
"Indicator light block" section of the list.
List of check codes (indoor unit)
(Check code 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
⎯
E11
⎯
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
⎯ SIM
⎯
SIM
⎯
SIM Indoor group address not set
⎯
SIM Indoor capacity not set
⎯
SIM
SIM
ALT Indoor AC fan check code
⎯
ALT Indoor overflow check code
⎯
ALT
ALT Other indoor unit check code
⎯
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 trouble on site
Indoor-remote controller periodic Communication from remote controller or network adaptor has
communication check code
been lost (so has central control communication).
Indoor-outdoor periodic
Signals are not being received from outdoor unit.
communication check code
Duplicated indoor address
Indoor unit detects address identical to its own.
UART communication trouble
Communication error between CDB(MCC-1643) and
FAN-IPDU(MCC-1610).
Communication check code
Communication check code between Application control kit and
between Application control kit
indoor unit P.C. board
and indoor unit
Check cod in periodic
Periodic communication between indoor header and follower units
communication between indoor
cannot be maintained.
header and follower unit
Indoor heat exchanger
Heat exchanger temperature sensor (TCJ) has been open /
temperature sensor (TCJ) check
shortcircuited.
code
Indoor heat exchanger Heat exchanger temperature sensor (TC2) has been open /
temperature sensor (TC2)
shortcircuited.
check code
Indoor heat exchanger Heat exchanger temperature sensor (TC1) has been open /
temperature sensor (TC1) shortcircuited.
check code
Ambient temperature sensor (TA)
Ambient temperature sensor (TA) has been open / short-circuited.
check code
Discharge temperature sensor Discharge temperature sensor (TF) has been open /
(TF) check code
shortcircuited.
P.C. board or other indoor
Indoor EEPROM is abnormal (some other error may be detected).
check code
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 check code Unit shutdown has been caused by external check code
input (interlock)
input (CN80).
Indoor AC fan check code is detected (activation of fan motor
thermal relay).
Float switch has been activated.
Indoor DC fan check code (e.g. overcurrent or lock-up)
Indoor DC fan check code
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 check code