– 50 –
MG-CTT: Magnet contactor
L29
L29
SIM Error in number of IPDUs
There are insufficient number of IPDUs (P.C.
boards) in inverter box.
L30 Detected indoor unit No.
(L30)
SIM
Indoor external error input
(interlock)
Indoor unit has been shut down for external error
input in one refrigerant line (detected by indoor
unit).
P03
–
P03
ALT
Outdoor discharge (TD1)
temperature error
Outdoor discharge temperature sensor (TD1) has
detected abnormally high temperature.
P05
00: Open phase detected
P05
ALT
Open phase/power failure
Open phase is detected when power is turned on.
Inverter DC voltage is too high (overvoltage) or too
low (undervoltage).
01: Compressor 1
02: Compressor 2
03: Compressor 3
Inverter DC voltage (Vdc)
error
MG-CTT error
P07
01: Compressor 1
02: Compressor 2
03: Compressor 3
P07
ALT
Heat sink overheating
error
Temperature sensor built into IGBT (TH) detects
overheating.
P13
–
P13
ALT
Outdoor liquid backflow
detection error
State of refrigerant cycle circuit indicates liquid
backflow operation.
P15
01: TS condition
02: TD condition
P15
ALT Gas leak detection
Outdoor suction temperature sensor (TS1) detects
sustained and repeated high temperatures that
exceed standard value.
P17
–
P17
ALT
Outdoor discharge (TD2)
temperature error
Outdoor discharge temperature sensor (TD2)
detects abnormally high temperature.
P18
–
P18
ALT
Outdoor discharge (TD3)
temperature error
Outdoor discharge temperature sensor (TD3)
detects abnormally high temperature.
P19 Outdoor unit No. detected
P19
ALT
4-way valve reversing
error
Abnormality in refrigerating cycle is detected
during heating operation.
P20
–
P20
ALT
Activation of high-pressure
protection
High pressure (Pd) sensor detects high pressure
that exceeds standard value.
Check code
Display of receiving unit
Typical fault site
Description of error
Outdoor 7-segment display
TCC-LINK
central control
or main remote
controller
display
Indicator light block
Sub-code
Flash
Operation Timer Ready
01
02
03
04
05
06
07
08
09
1 2
A3-IPDU Fan
IPDU
Fan
IPDU
3
0A
0B
0C
0D
0E
0F
1 2
A3-IPDU
O
O
O
O
O
O
O
O
3
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
O
Circle (O):
Faulty IPDU
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