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Check code
Outdoor 7-segment display
Sub-code
A3-IPDU Fan
A3-IPDU
IPDU
1 2
3
1 2
3
O
O
01
0A
O
O
O
02
0B
O
O
O
03
0C
L29
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
–
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
Fan
IPDU
O
O
O
L29
O
O
O
(L30)
P03
P05
P07
(P10)
P13
P15
P17
P18
P19
P20
Typical fault site
Flash
SIM Error in number of IPDUs
Indoor external error input
SIM
(interlock)
Outdoor discharge (TD1)
ALT
temperature error
Open phase/power failure
Inverter DC voltage (Vdc)
ALT
error
MG-CTT error
Heat sink overheating
ALT
error
ALT Indoor unit overflow
Outdoor liquid backflow
ALT
detection error
ALT Gas leak detection
Outdoor discharge (TD2)
ALT
temperature error
Outdoor discharge (TD3)
ALT
temperature error
4-way valve reversing
ALT
error
Activation of high-pressure
ALT
protection
– 50 –
Description of error
There are insufficient number of IPDUs (P.C.
boards) in inverter box.
Indoor unit has been shut down for external error
input in one refrigerant line (detected by indoor
unit).
Outdoor discharge temperature sensor (TD1) has
detected abnormally high temperature.
Open phase is detected when power is turned on.
Inverter DC voltage is too high (overvoltage) or too
low (undervoltage).
Temperature sensor built into IGBT (TH) detects
overheating.
Indoor unit has been shutdown in one refrigerant
line due to detection of overflow (detected by
indoor unit).
State of refrigerant cycle circuit indicates liquid
backflow operation.
Outdoor suction temperature sensor (TS1) detects
sustained and repeated high temperatures that
exceed standard value.
Outdoor discharge temperature sensor (TD2)
detects abnormally high temperature.
Outdoor discharge temperature sensor (TD3)
detects abnormally high temperature.
Abnormality in refrigerating cycle is detected
during heating operation.
High pressure (Pd) sensor detects high pressure
that exceeds standard value.
MG-CTT: Magnet contactor
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