Troubleshooting Method - Toshiba MMY-MAP1006FT8(J)P-E Service Manual

8-2. 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 problem site/problem part may be
identified in the event of a problem 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 problem in consultation with the list.
• When investigating a problem 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 problem on the basis of a display provided on an outdoor unit - See the "Outdoor 7-segment display" section of the list.
• When investigating a problem 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
TCC-LINK central Outdoor 7-segment display
control or main
remote controller
display
E03 –
E04 –
E08 E08 D u i l p
E10 –
E17
–
E18 –
F 0 1 –
F 0 2 –
F 0 3 –
F 1 0 –
F 1 1 –
F17 –
F18 –
F 2 9 –
J03 –
J10
–
J11
–
L 0 3 –
L 0 7 –
L 0 8 L 0 8
L 0 9 –
L12
L12
–
L17
–
L18
L 2 0 –
L30 Detected indoor unit No.
L30
Display of receiving unit
Indicator light block
Operation Timer Ready
Sub-code
–
–
a c e t i d d n o o a r d d e r s s
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
L17
L18
–
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 problem site
Flash
Indoor-remote controller periodic
communication trouble
Indoor-outdoor periodic
communication trouble
D u i l p a c e t i d d n o o a r d d e r s s
Indoor inter-MCU communication
trouble
Communication trouble between
indoor unit(s) and FS unit(s)
Trouble in periodic
communication between indoor
header and follower unit
Indoor heat exchanger
A L T
temperature sensor (TCJ) trouble
Indoor heat exchanger
A L T
temperature sensor (TC2) trouble
Indoor heat exchanger
A L T
temperature sensor (TC1) trouble
Room air temperature
A L T
sensor (TA/TSA) trouble
Discharge air temperature
A L T
sensor (TF/TFA) trouble
Outside air suction temperature
ALT
sensor (TOA) trouble
Indoor air suction temperature
ALT
sen sor (TRA) trouble
I S M P.C. board or other indoor trouble
Duplicated FS units
FS unit overflow trouble
FS unit temperature
sensor(TCS) trouble
Duplicated indoor group header
I S M
unit
Connection of group control cable
I S M
to stand-alone indoor unit
I S M Indoor group address not set
I S M Indoor capacity not set
FS unit(s) system trouble
Outdoor model incompatibility
SIM
trouble
Cooling/heating selection unit
SIM
trouble
I S M Duplicated central control address
Indoor external trouble
SIM
input (interlock)
− 152 −
: Flashing, : Goes off
Description of 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.
n I o d r o u 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 s t i
MCU communication between main controller and
motor microcontroller is troubled.
There is no communication from FS unit(s)
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.
Room air temperature sensor (TA) has been
open/short-circuited.
Discharge air temperature sensor (TF) has been
open/short-circuited.
Open/Short of outside air suction temperature
sensor (TOA) was detected.
Discharge air temperature sensor (TF) has been
open/short-circuited.
Open/Short of indoor air suction temperature
sensor (TRA) was detected.
More than one FS units have been set up in
one refrigirant line.
FS unit has been shutdown in one refrigerant
line due to detection of overflow
FS unit temperature sensor(TCS) has been
open/short-circuited.
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.
FS unit(s) outside the application setting
Old model outdoor unit (prior to 6 series) has
been connected
Cooling/heating cycle trouble resulting from
piping trouble is detected
There is duplication in central control address
setting.
Unit shutdown has been caused by external
trouble input (CN80).
o w . n