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Check code
Outdoor 7-segment display
Sub-code
A3-IPDU
Fan-IPDU
A3-IPDU
1
2
1
2
1
01
O
10
02
O
11
O
03
O
O
12
08
O
13
O
09
O
O
18
L29
0A
O
O
19
O
0B
O
O
O
1A
1B
O
Circle (O): Troubled IPDU
L30
Detected indoor unit No.
P03
–
00: Open phase detected
P05
01: Compressor 1
02: Compressor 2
01: Compressor 1
P07
02: Compressor 2
P10 Indoor unit No. detected
P13
–
01: TS condition
P15
02: TD condition
P17
–
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
2
1
2
O
O
O
O
O
O
O
O
L29
O
O
O
O
O
O
O
O
(L30)
P03
P05
P07
(P10)
P13
P15
P17
P19
P20
Typical problem site
Flash
SIM
Trouble in number
of IPDUs.
Indoor external trouble
SIM
input (interlock)
Outdoor discharge (TD1)
ALT
temperature trouble
Open phase/power failure
Inverter DC voltage
ALT
(Vdc) trouble
MG-CTT trouble
Heat sink overheating
ALT
trouble
ALT
Indoor unit overflow
Outdoor liquid backflow
ALT
detection trouble
ALT
Gas leak detection
Outdoor discharge (TD2)
ALT
temperature trouble
4-way valve
ALT
reversing trouble
Activation of high-pressure
ALT
protection
– 47 –
Description of check code
There are insufficient number of IPDUs (P.C.
boards) in inverter box
Indoor unit has been shut down for external
trouble 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 IPM (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.
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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Table of Contents
Troubleshooting
