Troubleshooting Method - Toshiba Carrier TCB-IFDMR01UP-UL Service Manual

8-2. Troubleshooting Method

The remote controls (main remote control and central control remote control) and the interface P.C. board of an
outdoor unit are provided with an LCD display (remote control) or a 7-segment display (outdoor interface P.C.
board) to display operational status. Using this self-diagnosis feature, the problem 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 control or TCC-LINK central
control remote control - See the "TCC-LINK remote control or main remote control 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 control-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 control
display
E03 –
E04 –
E08 E08
Duplicated indoor address
E18 –
F 0 1 –
F 0 2 –
F 0 3 –
F 1 0 –
F 1 1 –
F17 –
F18 –
F 2 9 –
L02 –
L 0 3 –
L 0 7 –
L 0 8 L 0 8
L 0 9 –
L 2 0 –
L22 –
Detected indoor unit
L30 L30
No.
P 0 1 –
Detected indoor unit
P10 P10
No.
P 3 1 –
Display of receiving unit
Indicator light block
Operation Timer Ready
Sub-code
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
: Lighting, : Flashing,
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 control periodic
communication trouble
Indoor-outdoor periodic
communication trouble
Duplicated indoor address
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 sensor
A L T
(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
P.C. board or other indoor
I S M
check code
Outdoor units model disagreed
trouble
Duplicated indoor group header
I S M
unit
Connection of group control
I S M
cable to stand-alone indoor unit
I S M
Indoor group address not set
I S M Indoor capacity not set
Duplicated central control
I S M
address
Incompatible group combination
of indoor units
SIM Indoor fan trouble input
A L T Indoor AC fan trouble
ALT
Safety contact input
A L T Other indoor unit trouble
- 57 -
: Goes off
Description of Check code
Communication from remote control has been
lost (so has central control communication).
Signals are not being received from outdoor unit.
Indoor unit detects address identical to its own.
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.
Indoor EEPROM is abnormal (some other
trouble may be detected).
In case of different outdoor unit (Not corresponded
to DX-COIL INTERFACE)
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.
There is duplication in central control address
setting.
Connection of group control between normal
indoor units and Indoor (DX) unit.
Unit shutdown has been caused by fan trouble
input (CN80 or CN90-pin 3).
Indoor AC fan trouble is detected (activation of
fan motor thermal relay).
Unit shutdown has been caused by safety
contact input (CN90-pin 2).
Follower unit cannot be operated due to header
unit alarm (E03/L03/L07/L08).