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List of Check Codes (Outdoor Unit)
(Errors detected by outdoor interface - typical examples)
Check code
Outdoor 7-segment display
Sub-code
Number of indoor units from which
E06
signal is received normally
E07
–
E08 Duplicated indoor address
E12
–
E15
–
00: Overloading
E16
01: Number of units connected
01: Connection of outdoor unit from
other refrigerant line
E20
02: Connection of indoor unit from
other refrigerant line
Fan IPDU
A3-IPDU
1 (Upper) 2 (Lower)
O
01
O
02
O
O
03
E
3
1
O
04
O
O
05
O
O
06
O
O
O
07
Circle (O): Faulty IPDU
F
0
4
–
F
0
6
–
F
0
7
–
F
0
8
–
F
1
2
–
F
1
5
–
F
1
6
–
F
2
3
–
F
2
4
–
Display of receiving unit
Indicator light block
TCC-LINK
central control
or main remote
Operation Timer
Ready
controller
Flash
display
E
0
6
(E04)
(E08)
E12
E15
E16
E20
E
3
1
F
0
4
A
F
0
6
A
F
0
7
A
F
0
8
A
F
1
2
A
F
1
5
A
F
1
6
A
F
2
3
A
F
2
4
A
111
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 fault site
Indoor unit initially communicating normally fails to
D
o r
p
p
n i
g
o
t u
f o
n i
d
o
r o
u
n
t i
return signal (reduction in number of indoor units
connected).
Indoor-outdoor
Signal cannot be transmitted to indoor units
communication circuit
(
error
outdoor unit).
More than one indoor unit is assigned same
Duplicated indoor address
address (also detected at indoor unit end).
Indoor automatic address setting is started while
Automatic address starting
automatic address setting for equipment in other
error
refrigerant line is in progress.
Indoor unit not found
Indoor unit fails to communicate while automatic
during automatic address
address setting for indoor units is in progress.
setting
Combined capacity of indoor units is too large
Too many indoor units
(more than 130 % of combined capacity of outdoor
connected / overloading
units).
Connection to other
Indoor unit from other refrigerant line is detected
refrigerant line found
while indoor automatic address setting is in
during automatic address
progress.
setting
There is no communication between IPDUs (P.C.
P I
D
U
c
o
m
m
u
n
c i
t a
o i
n
e
r r
r o
boards) in inverter box.
Outdoor discharge
Outdoor discharge temperature sensor (TD) has
L
T
temperature sensor (TD)
been open / short-circuited.
error
Outdoor heat exchanger
Outdoor heat exchanger temperature sensors (TE)
L
T
temperature sensor (TE)
have been open / short-circuited.
error
Outdoor liquid temperature
Outdoor liquid temperature sensor (TL) has been
L
T
sensor (TL) error
open / short-circuited.
Outdoor outside air
Outdoor outside air temperature sensor (TO) has
L
T
temperature sensor (TO)
been open / short-circuited.
error
Outdoor suction
Outdoor suction temperature sensor (TS) has
L
T
temperature sensor (TS)
been open / short-circuited.
error
Outdoor temperature
Wiring error in outdoor temperature sensors (TE,
L
T
sensor (TE, TL) wiring
TL) has been detected.
error
Outdoor pressure sensor
Wiring error in outdoor pressure sensors (Pd, Ps)
L
T
(Pd, Ps) wiring error
has been detected.
Low pressure sensor (Ps)
L
T
Output voltage of low pressure sensor (Ps) is zero.
error
Output voltage of high pressure sensor (Pd) is zero
High pressure sensor (Pd)
L
T
or provides abnormal readings when compressors
error
have been turned off.
99
: Flashing,
: Goes off
Description of error
indoor units left without communication from
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Troubleshooting
