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Check code
Outdoor 7-segment display
Sub-code
–
L08
–
L10
L17
–
–
L18
L28
SMMS (Series 1)
01: A3-IPDU1 error
02: A3-IPDU2 error
03: A3-IPDU1/A3-IPDU2 error
04: Fan IPDU error
05: A3-IPDU1
+ Fan IPDU error
06: A3-IPDU2
+ Fan IPDU error
07: All IPDU error
SMMS-i (Series 4)
A3-IPDU Fan
A3-IPDU
L29
IPDU
1 2
3
1 2
3
O
O
01
0A
O
O
O
02
0B
O
O
O
03
0C
O
O
O
04
0D
O
O
O
O
05
0E
O
O
O
O
O
06
0F
O
O
O
07
Circle (O):
O
Faulty IPDU
08
O
O
09
L30 Detected indoor unit No.
P03
–
P0301: Compressor 1
02: Compressor 2
P04
03: Compressor 3
00: Open phase detected
01: Compressor 1
P05
02: Compressor 2
03: Compressor 3
01: Compressor 1
P07
02: Compressor 2
03: Compressor 3
P10
Indoor unit No. detected
P13
–
01: TS condition
P15
02: TD condition
P17
–
P18
–
P19
Outdoor unit No. detected
P20
–
Display of receiving unit
TCC-LINK
Indicator light block
central control
or main remote
Operation Timer Ready
controller
display
(L08)
L10
L17
L18
L28
Fan
L29
IPDU
O
O
O
O
O
O
(L30)
P04
P05
P07
(P10)
P13
P15
P17
P18
P19
P20
Typical fault site
Flash
Address setting has not been performed for one or
SIM Indoor group address not
SIM
more indoor units (also detected at indoor end).
set
Outdoor unit capacity has not been set (after P.C.
Outdoor capacity not set
SIM
board replacement).
Old model outdoor unit (prior to 3 series) has been
Outdoor model
SIM
connected.
incompatibility error
Cooling / heating cycle error resulting from piping
FS (Flow Selector) unit
SIM
error is detected.
error
More than four outdoor units have been
Too many outdoor units
SIM
connected.
connected
There are insufficient number of IPDUs (P.C.
SIM
Error in number of IPDUs
boards) in inverter box.
Indoor unit has been shut down for external error
Indoor external error input
SIM
input in one refrigerant line (detected by indoor
(interlock)
unit).
Outdoor discharge temperature sensor (TD1) has
Outdoor discharge (TD1)
ALT
detected abnormally high temperature.
temperature error
High-pressure SW
High-pressure SW was activated.
ALT
activation
Open phase / power failure
Open phase is detected when power is turned on.
Inverter DC voltage (Vdc)
Inverter DC voltage is too high (overvoltage) or too
ALT
error
low (undervoltage).
MG-CTT error
Temperature sensor built into IGBT (TH) detects
Heat sink overheating
ALT
overheating.
error
Indoor unit has been shutdown in one refrigerant
Indoor unit overflow
line due to detection of overflow (detected by
ALT
indoor unit).
State of refrigerant cycle circuit indicates liquid
Outdoor liquid backflow
ALT
backflow operation.
detection error
Outdoor suction temperature sensor (TS1) detects
sustained and repeated high temperatures that
Gas leak detection
ALT
exceed standard value.
Outdoor discharge temperature sensor (TD2)
Outdoor discharge (TD2)
ALT
detects abnormally high temperature.
temperature error
Outdoor discharge (TD3)
Outdoor discharge temperature sensor (TD3)
ALT
temperature error
detects abnormally high temperature.
Abnormality in refrigerating cycle is detected
4-way valve reversing
ALT
during heating operation.
error
Activation of high-pressure
High pressure (Pd) sensor detects high pressure
ALT
protection
that exceeds standard value.
- 56 -
Description of error
MG-CTT: Magnet contactor
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Troubleshooting
