List of Check Codes (Outdoor Unit)
(Errors detected by outdoor interface - typical examples)
Check code
Display of receiving unit
Typical fault site
Description of error
Outdoor 7-segment display
TCC-LINK
central control
or main remote
controller
display
Indicator light block
Sub-code
Flash
E06 Number of indoor units from which
signal is received normally
ti
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D
6
0
E
Indoor unit initially communicating normally fails to
return signal (reduction in number of indoor units
connected).
E07
–
(E04)
Indoor-outdoor
communication circuit
error
Signal cannot be transmitted to indoor units
( indoor units left without communication from
outdoor unit).
E08 Duplicated indoor address
(E08)
Duplicated indoor address More than one indoor unit is assigned same
address (also detected at indoor unit end).
E12
–
E12
Automatic address starting
error
Indoor automatic address setting is started while
automatic address setting for equipment in other
refrigerant line is in progress.
E15
–
E15
Indoor unit not found
during automatic address
setting
Indoor unit fails to communicate while automatic
address setting for indoor units is in progress.
E16 00: Overloading
01: Number of units connected
E16
Too many indoor units
connected / overloading
Combined capacity of indoor units is too large
(more than 130 % of combined capacity of outdoor
units).
E20
01: Connection of outdoor unit from
other refrigerant line
02: Connection of indoor unit from
other refrigerant line
E20
Connection to other
refrigerant line found
during automatic address
setting
Indoor unit from other refrigerant line is detected
while indoor automatic address setting is in
progress.
T
L
A
4
0
F
–
4
0
F
Outdoor discharge
temperature sensor (TD)
error
Outdoor discharge temperature sensor (TD) has
been open / short-circuited.
T
L
A
6
0
F
–
6
0
F
Outdoor heat exchanger
temperature sensor (TE)
error
Outdoor heat exchanger temperature sensors (TE)
have been open / short-circuited.
T
L
A
7
0
F
–
7
0
F
Outdoor liquid temperature
sensor (TL) error
Outdoor liquid temperature sensor (TL) has been
open / short-circuited.
T
L
A
8
0
F
–
8
0
F
Outdoor outside air
temperature sensor (TO)
error
Outdoor outside air temperature sensor (TO) has
been open / short-circuited.
T
L
A
2
1
F
–
2
1
F
Outdoor suction
temperature sensor (TS)
error
Outdoor suction temperature sensor (TS) has
been open / short-circuited.
T
L
A
5
1
F
–
5
1
F
Outdoor temperature
sensor (TE, TL) wiring
error
Wiring error in outdoor temperature sensors (TE,
TL) has been detected.
T
L
A
6
1
F
–
6
1
F
Outdoor pressure sensor
(Pd, Ps) wiring error
Wiring error in outdoor pressure sensors (Pd, Ps)
has been detected.
T
L
A
3
2
F
–
3
2
F
Low pressure sensor (Ps)
error
Output voltage of low pressure sensor (Ps) is zero.
T
L
A
4
2
F
–
4
2
F
High pressure sensor (Pd)
error
Output voltage of high pressure sensor (Pd) is zero
or provides abnormal readings when compressors
have been turned off.
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
A3-IPDU
Fan IPDU
01
02
03
04
05
06
07
Circle (O): Faulty IPDU
O
O
O
O
O
O
O
O
1 (Upper) 2 (Lower)
O
O
O
O
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1
3
E
1
3
E
There is no communication between IPDUs (P.C.
boards) in inverter box.
99