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 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
Display of receiving unit
Typical problem site Description of Check code
Outdoor 7-segment display Indicator light block
Sub-code
Flash
E03
Indoor-remote controller periodic
communication trouble
Communication from remote controller or network
adaptor has been lost (so has central control
communication).
E04
––
––
Indoor-outdoor periodic
communication trouble
Signals are not being received from outdoor unit.
E08 E08
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E10
Indoor inter-MCU communication
trouble
MCU communication between main controller and
motor microcontroller is troubled.
E18
Trouble in periodic
communication between indoor
header and follower unit
Periodic communication between indoor header
and follower units cannot be maintained.
TLA––10F
Indoor heat exchanger
temperature sensor (TCJ) trouble
Heat exchanger temperature sensor (TCJ) has
been open/short-circuited.
TLA––20F
Indoor heat exchanger
temperature sensor (TC2) trouble
Heat exchanger temperature sensor (TC2) has
been open/short-circuited.
TLA––30F
Indoor heat exchanger
temperature sensor (TC1) trouble
Heat exchanger temperature sensor (TC1) has
been open/short-circuited.
TLA––01F
Room air temperature
sensor (TA/TSA) trouble
Room air temperature sensor (TA) has been
open/short-circuited.
TLA––11F
Discharge air temperature
sensor (TF/TFA) trouble
Discharge air temperature sensor (TF) has been
open/short-circuited.
MIS––92F
P.C. board or other indoor trouble
Open/Short of indoor air suction temperature
sensor (TRA) was detected.
MIS––30L
Duplicated indoor group header
unit
There is more than one header unit in group.
MIS––70L
Connection of group control cable
to stand-alone indoor unit
There is at least one stand-alone indoor unit to
which group control cable is connected.
MIS–80L80L
Indoor group address not set
Address setting has not been performed for one or
more indoor units (also detected at outdoor unit
end).
MIS––90L
Indoor capacity not set
Capacity setting has not been performed for indoor
unit.
MIS––02L
Duplicated central control address
There is duplication in central control address
setting.
Indoor external trouble
input (interlock)
Unit shutdown has been caused by external
trouble input (CN80).
––
––
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
: Lighting, : Flashing, : Goes off
ALT.: Flashing is alternately when there are two flashing LED
SIM: Simultaneous flashing when there are two flashing LED
Operation
Timer Ready
TCC-LINK central
control or main
remote controller
display
ALT
Outside air suction temperature
sensor (TOA) trouble
Open/Short of outside air suction temperature
sensor (TOA) was detected.
ALT
Indoor air suction temperature
sen sor (TRA) trouble
Discharge air temperature sensor (TF) has been
open/short-circuited.
––
F17
––
F18
− 136 −
E17
Communication trouble between
indoor unit(s) and FS unit(s)
There is no communication from FS unit(s)
––
J03 Duplicated FS units
More than one FS units have been set up in
one refrigirant line.
J10 FS unit overflow trouble
FS unit has been shutdown in one refrigerant
line due to detection of overflow
J11
FS unit temperature
sensor(TCS) trouble
FS unit temperature sensor(TCS) has been
open/short-circuited.
––
Detected indoor unit No.
J10
––
L30
Detected indoor unit No.
SIM
L30
L18
Detected indoor unit No.
Cooling/heating selection unit
trouble
Cooling/heating cycle trouble resulting from
piping trouble is detected
L18
SIM
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