DOWNLOAD LG LS-J0760NL / LS-J0820NL / LS-J0961NL_NT / LS-L1220NL / LS-L1260NL_NT Service Manual ↓ Size: 2.07 MB | Pages: 74 in PDF or view online for FREE

Model
LS-J0760NL LS-J0820NL LS-J0961NL_NT LS-L1220NL LS-L1260NL_NT
Pages
74
Size
2.07 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
ls-j0760nl.zip
Date
PREV: LG LS-J0760HL Service Manual

LG LS-J0760NL / LS-J0820NL / LS-J0961NL_NT / LS-L1220NL / LS-L1260NL_NT Service Manual ▷ View online

-59-
Does the Operating LED of indoor unit blink
when Operation's ON?
Is the Connection between indoor power
relay Pin 
➂
and terminal block No. 1 right?
Refer to the self-diagnosis function.
The Outdoor Unit does not operate at all.
Trouble 6
YES
Check the connecting state of connector
NO
NO
Is the connection of cable between indoor
and outdoor unit right?
Indoor
Outdoor
1(Brown)
1(Brown)
2(Blue)
2(Blue)
3(Green/YL)
3(Green/YL)
4(Red)
4(Red)
NO
YES
Is the voltage of CN-POWER 
➀
,
➁
in
outdoor PCB Ass'y about AC220V / 240V
when Operation's ON?
Check the Fuse of Outdoor PCB Ass'y.
NO
YES
Is the voltage of CN-AC 
➀
,
➂
in outdoor
PCB Ass'y about AC220V / 240V?
Check the PTC and RY-PWR.
NO
YES
Is the Bridge Diode(DB01Z) right?
Replace the Bridge Diode.
NO
YES
Replace the PCB Ass'y.
NO
-60-
Does the LED01M of outdoor PCB Ass'y
blink 6 times?
Check the state of connecting cable (3 line)
between indoor and outdoor uint.
When compressor does not operate normally.
■
DC Peak Error(Error Code 
➅
)
Trouble 7-1
NO
YES
Is the connecting state of connectors in
outdoor Sub. PCB Ass'y right?
(CN-UVW, CN-IPM)
• Electrical wiring diagram (Colors)
• Check the connecting state of connectors
in PCB Ass'y(Main/Sub)
• If CN-UWV is connected, the comprressor
can be operated a opposite direction.
NO
YES
Is the power module in Sub PCB Ass'y
right?
• Check the short P-N P-U, V, W, and N-U,
V, W of IPM and then collector, emiter of
IGBT
• Replace the Sub PCB Ass'y.
NO
YES
Is the voltage of CN-AC over than
AC170V?
Check the supplied voltage.
NO
YES
Is the voltage of CN-DC over than about
DC380V?
• Check CN-IPM connector(Pin No. 12)
• Replace the Sub PCB Ass'y.
NO
YES
Is the refrigerant pressure right?
Replace the PCB Ass'y.
• Main PCB Ass'y
• Sub PCB Ass'y
• Control Box Ass'y
Supply the refrigerant.
NO
NO
-61-
When compressor does not oprate normally.
■
Communication error between Indoor and Outdoor (Error Code 
➄
)
Trouble 7-2
Does the operating LED in display PCB
Ass'y blink 5 times?
• Check the state of connecting cable 
(3 line) bewteen indoor and outdoor unit .
• Check Fuse, Noise Filter, PTC, etc.
NO
YES
Is the voltage of CN-POWER Pin No. 1,2
AC220/240V in Main PCB Ass'y.
• Electrical wiring diagram(Colors)
• Check the connecting state
of connectors in outdoor PCB Ass'y
(Main/Sub)
• Check the Fuse of outdoor Control Box.
NO
YES
Is the voltage of CN-AC AC220/240V in
SUB PCB Ass'y?
• Check the connecting state of connectors
in PCB Ass'y(Main/Sub).
NO
YES
Is the voltage of CN-DC over than
DC350V?
Replace the Sub PCB Ass'y.
NO
YES
Is the connection of CN-DATA between
indoor and outdoor unit right?
Replace the PCB Ass'y.
• Main PCB Ass'y (Indoor/Outdoor)
• Control Box Ass'y.
• Reconnect the cable to terminal block.
• Check the PCB pattern(Resoldering).
NO
YES
-62-
When compressor does not oprate normally.
■
CT Error (Error Code 
➆
)
Trouble 7-3
Does the operating LED in Display PCB
Ass'y blink 7 times?
• Check the state of connecting cable 
(3 line) bewteen Indoor and Outdoor Unit .
• Check fuse, Noise Filter, PTC, etc.
NO
YES
Is the courrent transformer(CT) in Main
PCB Ass'y right?
Check the PCB pattern(resoldering)
NO
YES
Is the indoor/outdoor fan locked?
Check the indoor/outdoor fan motor.
NO
YES
Is the discharge temperature of Indoor unit
right(11°C~17°C) in the cooling mode?
Check the compressor.
NO
YES
Is the refrigerant pressure right?
Supply the refrigerant
NO
YES
Replace the PCB Ass'y.
• Main PCB Ass'y(Outdoor)
• Control Box Ass'y(Outdoor)
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