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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
L
2
9
0A
O
O
19
O
0B
O
O
O
1A
1B
O
Circle (O): IPDU trouble
L
3
0
D
e
e t
c
e t
d
n i
d
o
r o
u
n
t i
N
. o
P
0
3
–
00: Open phase detected
P05
01: Compressor 1
02: Compressor 2
01: Compressor 1
P07
02: Compressor 2
P
1
0
n I
d
o
r o
u
n
t i
N
. o
d
e
e t
c
e t
d
P
1
3
–
01: TS condition
P15
02: TD condition
P
1
7
–
P
1
9
O
u
d t
o
r o
u
n
t i
N
. o
d
e
e t
c
e t
d
P
2
0
–
Display of receiving unit
TCC-LINK
Indicator light block
central control
or main remote
Operation Timer Ready
control
display
Fan-IPDU
2
1
2
O
O
O
O
O
O
O
O
L
2
9
O
O
O
O
O
O
O
O
L (
3
) 0
P
0
3
P
0
5
P
0
7
P (
1
) 0
P
1
3
P
1
5
P
1
7
P
1
9
P
2
0
Typical problem site
Flash
I S
M
Trouble in number IPDUs
Indoor external trouble
I S
M
input (interlock)
Outdoor discharge (TD1)
A
L
T
temperature trouble
Open phase/power failure
Inverter DC voltage (Vdc)
A
L
T
trouble
MG-CTT trouble
Heat sink overheating
A
L
T
trouble
A
L
T
n I
d
o
r o
u
n
t i
o
v
e
f r
o l
w
Outdoor liquid backflow
A
L
T
detection trouble
A
L
T
G
a
s
e l
a
k
d
e
e t
t c
o i
n
Outdoor discharge (TD2)
A
L
T
temperature trouble
4-way valve reversing
A
L
T
trouble
Activation of high-pressure
A
L
T
protection
82
Description of problem
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
