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List of Check Codes (Outdoor Unit)
(Errors detected by SMMS-i 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
01: Indoor-outdoor communication
E12
02: Outdoor-outdoor
communication
E15
–
00: Overloading
E16
01: Number of units connected
00: No header unit
E19
02: Two or more header units
01: Connection of outdoor unit from
other refrigerant line
E20
02: Connection of indoor unit from
other refrigerant line
E23
–
E25
–
Address of outdoor unit from which
E26
signal is not received normally
E
2
8
D
e
e t
c
e t
d
o
u
d t
o
r o
u
n
t i
N
. o
A3-IPDU Fan
A3-IPDU
IPDU
1 2
3
1 2
O
O
01
0A
O
O
O
02
0B
O
O
03
0C
E
3
1
O
O
04
0D
O
O
O
05
0E
O
O
O
O
06
0F
O
O
O
07
Circle (O):
O
Faulty IPDU
08
O
O
09
F
0
4
–
F05
–
01: TE1
F06
02: TE2
F
0
7
–
F
0
8
–
F11
–
Display of receiving unit
TCC-LINK
Indicator light block
central control
or main remote
Operation Timer Ready
controller
display
E
0
6
(E04)
(E08)
E12
E15
E16
E19
E20
E23
E25
E26
E
2
8
Fan
IPDU
3
O
O
O
O
E
3
1
O
O
O
O
O
O
F
0
4
F05
F
0
6
F
0
7
F
0
8
F11
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
Flash
D
o r
p
p
n i
g
o
t u
f o
n i
d
o
r o
u
n
t i
Indoor-outdoor
communication circuit
error
Duplicated indoor address
Automatic address starting
error
Indoor unit not found
during automatic address
setting
Too many indoor units
connected/overloading
Error in number of outdoor
header units
Connection to other
refrigerant line found
during automatic address
setting
Outdoor-outdoor
communication
transmission error
Duplicated follower
outdoor address
Dropping out of outdoor
unit
O
u
d t
o
r o
o f
o l l
w
r e
u
n
t i
e
r r
r o
P I
D
U
c
o
m
m
u
n
c i
t a
o i
n
e
r r
r o
Outdoor discharge
A
L
T
temperature sensor (TD1)
error
Outdoor discharge
ALT
temperature sensor (TD2)
error
Outdoor heat exchanger
A
L
T
temperature sensor (TE1,
TE2) error
Outdoor liquid temperature
A
L
T
sensor (TL) error
Outdoor outside air
A
L
T
temperature sensor (TO)
error
– 167 –
: Flashing,
: Goes off
Description of error
Indoor unit initially communicating normally fails to
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.
• Outdoor automatic address setting is started
while automatic address setting for indoor units
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 135% of combined capacity of outdoor
units).
There is no or more than one outdoor header unit
in one refrigerant line.
Indoor unit from other refrigerant line is detected
while indoor automatic address setting is in
progress.
Signal cannot be transmitted to other outdoor
units.
There is duplication in outdoor addresses set
manually.
Follower outdoor unit initially communicating
normally fails to do so (reduction in number of
follower outdoor units connected).
Outdoor header unit detects fault relating to
follower outdoor unit (detail displayed on follower
outdoor unit).
There is no communication between IPDUs (P.C.
boards) in inverter box.
Outdoor discharge temperature sensor (TD1) has
been open/short-circuited.
Outdoor discharge temperature sensor (TD2) has
been open/short-circuited.
Outdoor heat exchanger temperature sensors
(TE1, TE2) 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.
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Troubleshooting
