Check code
Location
of
detection
Description
System status
Trouble
detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
L29
L29
I/F
Trouble
in No.
of
IPDUs
All stop
Insufficient number of IPDUs
are detected when power is
turned on.
• 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
defect.
L30
L30
Detected indoor address
Indoor
unit
External
interlock of
indoor unit
Stop of
corresponding
unit
• Signal is present at
external
trouble
input
terminal (CN80) for 1
minute.
When external device is
connected to CN80
connector:
1) Check for defect in
external device.
2) Check for defect in indoor
P.C. board.
When external device is not
connected to CN80
connector:
1) Check for defect in indoor
P.C. board.
– L31
–
I/F
Extended IC
trouble
Continued
operation
There is part failure in P.C.
board (I/F).
Check outdoor P.C. board
(I/F).
P01 –
–
Indoor
unit
Indoor fan
trouble
Stop of
corresponding
unit
• Check the lock of fan motor
(AC fan).
• Check wiring.
P03 P03
–
I/F
Discharge
temperature
TD1
trouble
All stop
Discharge temperature (TD1)
exceeds 115°C.
• Check outdoor service
valves (gas side, liquid
side) to confirm full
opening.
• Check outdoor PMVs
(PMV1,
3
) for clogging.
• Check resistance
characteristics of TD1
sensor.
• Check for insufficiency in
refrigerant quantity.
• Check for defect in 4-way
valve.
• Check for leakage of SV4
circuit.
• Check SV4 circuit (wiring
or installation error
in SV41
or SV4
2
).
Circle (O): IPDU
trouble
1
2
1
2
1
2
1
2
01
○
10
○
02
○
11
○
○
03
○
○
12
○
○
08
○
13
○
○
○
09
○
○
18
○
○
0A
○
○
19
○
○
○
0B
○
○
○
1A
○
○
○
1B
○
○
○
○
A3-IPDU
A3-IPDU
Fan-IPDU
Fan-IPDU
−
72
−
AMP Air Conditioning
www.ampair.co.uk | [email protected]
