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Check code
Outdoor 7-segment display
Sub-code
P.C.board
P.C.board
Compressor Fan Motor
Compressor Fan Motor
1
2
1
2
1
2
01
O
11
O
02
O
12
O
03
O
O
13
O
O
L
2
9
08
O
18
09
O
O
19
O
0A
O
O
1A
O
0B
O
O
O
1B
O
O
10
O
Circle (O): Trouble P.C. board
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: Power detection trouble
01: Open phase
P
0
5
02: Power supply miswiring
1 : Compressor 1 heat sink trouble
2 : Compressor 2 heat sink trouble
P
0
7
04: Heat sink dew condensation
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
1
–
P
1
3
–
01: TS condition
P
1
5
02: TD condition
P17
–
P19 Outdoor unit No. detected
P20
–
Display of receiving unit
Central
Indicator light block
control or
main remote
Operation Timer Ready
controller
display
1
2
O
O
O
O
L
2
9
O
O
O
L (
3
) 0
P
0
3
P
0
5
P
0
7
P (
1
) 0
P
1
1
P
1
3
P
1
5
P17
P19
P20
Typical problem site
Flash
Trouble in number of
I S
M
P.C. boards
Indoor external trouble
SIM
input (interlock)
Outdoor discharge (TD1)
ALT
temperature trouble
Power detection trouble
/Open phase detection
A
L
T
/Power supply miswiring
detection
Heat sink overheating
trouble
A
L
T
Heat sink dew
condensation trouble
A
L
T
Indoor unit overflow
Outdoor heat exchanger
A
L
T
freeze trouble
Outdoor liquid backflow
A
L
T
detection trouble
A
L
T
Gas leak detection
Outdoor discharge (TD2)
ALT
temperature trouble
4-way valve reversing
ALT
trouble
Activation of high-pressure
ALT
protection
- 66 -
Description of problem
There are insufficient number of P.C. board 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.
Outdoor liquid temperature sensor (TL2) has
detected abnormally low temperature.
Indoor unit has been shutdown in one refrigerant
line due to detection of overflow (detected by
indoor unit).
Remaining frost on outdoor heat exchanger
has been detected repeatedly.
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
