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List of check codes (outdoor unit)
(Errors detected by SMMS outdoor interface typical examples)
Check code
Outdoor 7-segment display
Sub-code
TCC-LINK
central control
or main remote
controller
display
E06
Number of indoor units from which
signal is received normally
E06
E07
—
E08 Duplicated indoor address
IPDU: Intelligent Power Drive Unit (Inverter P.C. board)
Indoor unit (including Hot Water Module)
Typical fault site
Description of error
Dropping out of indoor unit
Indoor unit initially communicating normally fails to return signal
(reduction in number of indoor units connected).
(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
More than one indoor unit is assigned same address (also
detected at indoor unit end).
01: Indoor-outdoor communication
E12 02: Outdoor-outdoor
communication
E12
Automatic address starting error
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.
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 135 %
of combined capacity of outdoor units). ∗
E19
00: No header unit
02: Two or more header units
E19
Error in number of outdoor
header units
There is no or more than one outdoor header unit in one
refrigerant line.
01: Connection of outdoor unit
from other refrigerant line
E20 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.
E23
E23
Outdoor-outdoor communication
transmission error
Signal cannot be transmitted to other outdoor units.
There is duplication in outdoor addresses set manually.
—
E25
—
E25
Duplicated follower outdoor
address
E26
Address of outdoor unit from which
signal is not received normally
E26
Dropping out of outdoor unit
Follower outdoor unit initially communicating normally fails to do
so (reduction in number of follower outdoor units connected).
E28
Outdoor follower unit error
Outdoor header unit detects fault relating to follower outdoor unit
(detail displayed on follower outdoor unit).
E31
IPDU communication error
There is no communication between IPDUs (P. C. boards) in
inverter box.
E28 Detected outdoor unit No.
A3-IPDU Fan
A3-IPDU Fan
1
01 O
02
03 O
E31 04
05 O
06
07 O
08
09 O
2 3 IPDU
O
O
O
O
OO
OO
O
O
1 2 3 IPDU
O
0A
O
O
0B O O
0C
O O
0D O
O O
0E O O O
0F O O O O
Circle (O):
Faulty IPDU
F04
—
F04
Outdoor discharge temperature
sensor (TD1) error
Outdoor discharge temperature sensor (TD1) has been open /
short-circuited.
F05
—
F05
Outdoor discharge temperature
sensor (TD2) error
Outdoor discharge temperature sensor (TD2) has been open /
short-circuited.
Outdoor heat exchanger
temperature sensor (TE1, TE2)
error
Outdoor liquid temperature
sensor (TL) error
Outdoor heat exchanger temperature sensors (TE1, TE2) have
been open / short-circuited.
Outdoor outside air
temperature sensor (TO) error
Outdoor outside air temperature sensor (TO) has been open /
short-circuited.
F06
01: TE1
02: TE2
F06
Outdoor liquid temperature sensor (TL) has been open /
short-circuited.
F07
—
F07
F08
—
F08
F11
—
F11
F12
—
F12
Outdoor suction
temperature sensor (TS1) error
Outdoor suction temperature sensor (TS1) has been open /
short-circuited.
01: Compressor 1
F13 02: Compressor 2
03: Compressor 3
F13
Outdoor IGBT built-in
temperature sensor (TH) error
Open-circuit or short-circuit of the outdoor IGBT built-in
temperature sensor (TH) was detected.
F15
—
F15
Outdoor temperature sensor
(TE1, TL) wiring error
Wiring error in outdoor temperature sensors (TE1, TL) has been
detected.
F16
—
F16
Outdoor pressure sensor (Pd, Ps) Wiring error in outdoor pressure sensors (Pd, Ps) has been
wiring error
detected.
F19
—
F19
Indoor TF(TCJ2) sensor error
• Check connection of TF sensor connector.
• Check resistance characteristics of TF sensor.
F22
—
F22
Outdoor discharge temperature
sensor (TD3) error
Outdoor discharge temperature sensor (TD3) has been open /
short-circuited.
F23
—
F23
Low pressure sensor (Ps) error
Output voltage of low pressure sensor (Ps) is zero.
∗ When the indoor unit connection capacity is calculated, AP005 is calculated as 0.8 HP.
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