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Check code
Outdoor 7-segment display
Main
remote
Check
controller
Sub-code
code
A3-IPDU
Fan-IPDU
1
2
1
01
O
02
O
03
O
O
08
O
09
O
O
0A
O
O
L29
L29
0B
O
O
O
10
11
O
12
O
13
O
O
18
O
19
O
O
1A
O
O
1B
O
O
O
Circle (O): Troubled IPDU
Detected indoor
address
L30
L30
—
L31
—
P01
—
—
P03
P03
—
Location
Description
of
detection
I/F
Trouble in No.
of IPDUs
2
O
O
O
O
O
O
O
O
Indoor unit
External interlock
of indoor unit
I/F
Extended IC
trouble
Indoor unit
Indoor fan motor
trouble
I/F
Discharge
temperature TD1
trouble
Check code detection
System status
condition(s)
All stop
Insufficient number of
IPDUs are detected when
power is turned on.
Stop of
• Signal is present at
corresponding
external trouble input
unit
terminal (CN80) for 1
minute.
Continued
There is part failure in
operation
P.C. board (I/F).
Stop of
corresponding
unit
All stop
Discharge temperature
(TD1) exceeds 115°C.
– 60 –
Check items (locations)
• Check model setting of P.C. board
for servicing outdoor I/F P.C. board.
• Check connection of UART
communication connector.
• Check A3-IPDU, fan IPDU, and
I/F P.C. board for trouble.
When external device is
connected to CN80 connector:
1) Check for trouble in external
device.
2) Check for trouble in indoor P.C.
board.
When external device is not
connected to CN80 connector:
1) Check for trouble in indoor P.C.
board.
• Check outdoor P.C. board (I/F).
• Check the lock of fan motor
(AC fan).
• Check wiring.
• Check outdoor service valves (gas
side, liquid side) to confirm full
opening.
• Check outdoor PMVs (PMV1,4) for
clogging.
• Check resistance characteristics
of TD1 sensor.
• Check for insufficiency in
refrigerant quantity.
• Check for trouble in 4-way valve.
• Check for leakage of SV4 circuit.
• Check SV4 circuit (wiring or
installation trouble in SV41 or
SV42).
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Table of Contents
Troubleshooting
