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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
Comp.
Fa
n
O
01
O
02
O
O
03
E
3
1
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
D
Indoor-outdoor
(E04)
communication circuit
error
(E08)
Duplicated indoor address
Automatic address starting
E12
error
Indoor unit not found
E15
during automatic address
setting
Too many indoor units
E16
connected / overloading
Connection to other
refrigerant line found
E20
during automatic address
setting
E
3
1
P I
Outdoor discharge
F
0
4
A
L
T
temperature sensor (TD)
error
Outdoor heat exchanger
F
0
6
A
L
T
temperature sensor (TE)
error
Outdoor liquid temperature
F
0
7
A
L
T
sensor (TL) error
Outdoor outside air
F
0
8
A
L
T
temperature sensor (TO)
error
Outdoor suction
F
1
2
A
L
T
temperature sensor (TS)
error
Outdoor temperature
F
1
5
A
L
T
sensor (TE, TL) wiring
error
Outdoor pressure sensor
F
1
6
A
L
T
(Pd, Ps) wiring error
Low pressure sensor (Ps)
F
2
3
A
L
T
error
High pressure sensor (Pd)
F
2
4
A
L
T
error
88
111
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 fault site
Indoor unit initially communicating normally fails to
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).
Signal cannot be transmitted to indoor units
(
indoor units left without communication from
outdoor unit).
More than one indoor unit is assigned same
address (also detected at indoor unit end).
Indoor automatic address setting is started while
automatic address setting for equipment in other
refrigerant line is in progress.
Indoor unit fails to communicate while automatic
address setting for indoor units is in progress.
Combined capacity of indoor units is too large
(more than 130 % of combined capacity of outdoor
units).
Indoor unit from other refrigerant line is detected
while indoor automatic address setting is in
progress.
There is no communication between IPDUs (P.C.
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 temperature sensor (TD) has
been open / short-circuited.
Outdoor heat exchanger temperature sensors (TE)
have been open / short-circuited.
Outdoor liquid temperature sensor (TL) has been
open / short-circuited.
Outdoor outside air temperature sensor (TO) has
been open / short-circuited.
Outdoor suction temperature sensor (TS) has
been open / short-circuited.
Wiring error in outdoor temperature sensors (TE,
TL) has been detected.
Wiring error in outdoor pressure sensors (Pd, Ps)
has been detected.
Output voltage of low pressure sensor (Ps) is zero.
Output voltage of high pressure sensor (Pd) is zero
or provides abnormal readings when compressors
have been turned off.
: Goes off
Description of error
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Troubleshooting
