Troubleshooting Method - Toshiba MCY-MHP0806HT8-C Series Service Manual

9-2. Troubleshooting method

The remote controllers (main remote controller and central 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 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 "Light sensor indicator light block"
section of the list.
List of Check Codes (Indoor Unit)
(Check code detected by indoor unit)
Check code
Outdoor 7-segment display
TCC-LINK
central control
or main remote
Sub-code
controller
display
E03 – –
E04 – –
E08 E08 D u i l p a c e t i d d n o o a r
E10 – –
E18 – –
F 0 1 – –
F 0 2 – –
F 0 3 – –
F 1 0 – –
F 1 1 – –
F 2 9 – –
L 0 3 – –
L 0 7 – –
L 0 8 L 0 8 –
L 0 9 – –
L 2 0 – –
L30 L30 Detected indoor unit No.
P 0 1 – –
P10 P10 Detected indoor unit No.
P 1 2 – –
P 3 1 – –
Display of receiving unit
Indicator light block
Operation Timer Ready
Flash
Indoor-remote controller periodic
communication trouble
Indoor-outdoor periodic communication
trouble
d d e r s s D
Indoor inter-MCU communication trouble
Trouble in periodic communication
between indoor header and follower
unit
Indoor heat exchanger temperature
A L T
sensor (TCJ) trouble
Indoor heat exchanger temperature
A L T
sensor (TC2) trouble
Indoor heat exchanger temperature
A L T
sensor (TC1) trouble
A L T Ambient temperature sensor (TA) Trouble
Discharge temperature sensor (TF)
A L T
trouble
I S M P.C. board or other indoor trouble
I S M Duplicated indoor group outdoor unit
Connection of group control cable to
I S M
stand-alone indoor unit
I S M Indoor group address not set
I S M Indoor capacity not set
I S M Duplicated central control address
SIM Indoor external trouble input (interlock)
A L T Indoor AC fan trouble
ALT Indoor overflow trouble
A L T Indoor DC fan trouble
A L T Other indoor unit trouble
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 site
u i l p a c e t i d d n o o a r d d e r s s
95
109
: Flashing, : Goes off
D e s c i r t p o i n f o check code
Communication from remote controller or network adaptor
has been lost (so has central control communication).
Signals are not being received from outdoor unit.
I d n o o u r i n d t t e c e s t a d d e r s s d i n e c i t l a o t
MCU communication between main controller and motor
microcontroller is troubled．
Periodic communication between indoor header and follower
units cannot be maintained.
Heat exchanger temperature sensor (TCJ) has been open /
short-circuited.
Heat exchanger temperature sensor (TC2) has been open /
short-circuited.
Heat exchanger temperature sensor (TC1) has been open /
short-circuited.
Ambient temperature sensor (TA) has been open / short-
circuited.
Discharge temperature sensor (TF) has been open / short-
circuited.
Indoor EEPROM is abnormal (some other trouble may be
detected).
There is more than one outdoor 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.
There is duplication in central control address setting.
Unit shutdown has been caused by external trouble input
(CN80).
Indoor AC fan trouble is detected (activation of fan motor
thermal relay).
Float switch has been activated.
Indoor DC fan trouble (e.g. overcurrent or lock-up) is detected.
Follower unit cannot be operated due to outdoor unit alarm
(E03 / L03 / L07 / L08).
s t i o w . n