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Model
LWC1264AAG_AAN_ACE_ACF_ACN_ACP_BAG_BCF_BCG_BCS_ACG LWC1264PAG_PAN_PCG_QAG_QAS_QAE LWC1264AHE_AHF_AHG_ABG_BBG LWC1264PBG_PHG_QBG_VBS LWC126CGAB0 LWC1264BAE W12LH
Pages
52
Size
1.43 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
lwc1264aag-aan-ace-acf-acn-acp-bag-bcf-bcg-bcs-acg.zip
Date
PREV: LG LWC1262PHG / LWC1262ACG_N_P Service Manual

LG LWC1264AAG_AAN_ACE_ACF_ACN_ACP_BAG_BCF_BCG_BCS_ACG / LWC1264PAG_PAN_PCG_QAG_QAS_QAE / LWC1264AHE_AHF_AHG_ABG_BBG / LWC1264PBG_PHG_QBG_VBS / LWC126CGAB0 / LWC1264BAE / W12LH Service Manual ▷ View online

—21—
Fails to Start
Check circuit breaker
and fuse.
Gas leakage of feeler bulb
of thermostat
Check of control switch.
Fan only fails to start.
Improper wiring.
Defect of fan motor
capacitor.
Irregular motor resistance
(    ).
Irregular motor insulation
(    ).
Replacement of fan motor.
Regular but fails to start.
Replacement of compressor
(locking of rotor, metal).
Improper thermostat setting.
Loose terminal connection.
Improper wiring.
Irregular motor resistance (    ) 
Irregular motor insulation (     )
Replacement of compressor
(Motor damaged)
Drop of power voltage.
 Capacitor check.
Replacement
Compressor only fails to
start.
Defect of compressor
capacitor.
Check of power source.
Check of control switch
setting.
—22—
• Check the Fuse.
• Check the wiring diagram.
Is the Trans input power
AC 220/240V?
Is the Trans output power
about AC 13V?
Is shorted the Trans. output?
Is output Voltage of IC01D
DC 12V?
Is output Voltage of IC02D
DC 5V?
Is the voltage No.20 of Micom
DC 5V?
Exchange Main PCB Ass'y.
Is the 
connection between
Main and Display 
all right?
Is the reset circuit all right?
(The No.16 of
Micom is 5V.)
• Check the Fuse.
• Check the wiring diagram.
• Check the Main 
  PCB pattern.
• Exchange the Trans.
• Exchange D02D~D05D.
• Exchange IC01D.
• Exchange IC02D.
• Exchange IC01A, C02A.
• Connect connector
  exactly.
• Check the PCB 
  pattern.
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
YES
■
ELECTRICAL PARTS TROUBLESHOOTING GUIDE: 
LWC1264PAG/PAN/PCG, LWC1264QAG/QAS
Possible Trouble 1
The unit does not operate.
—23—
Possible Trouble 2
The compressor does not operate.
Possible Trouble 3
The compressor always operate.
Is setting 
Temp. set lower  than Room 
Temp.-0.5
°
C?
Is the voltage No.11
of IC01M 0V?
• Exchange IC01M.
• Select the setting Temp. to lower Number.
• Wait 3 Minutes.
Is the Unit for 3 minutes
delay?
• Exchange MAIN 
  PCB Ass'y.
Is the voltage N0.6 of 
IC01M DC 5V?
• Check the RY-COMP.
• Check the wiring 
  Diagram.
NO
NO
NO
YES
YES
YES
YES
Is the wire connection of 
RY-COMP all right?
• Check the RY-COMP.
• Connect LEAD Wire to 
  RY-COMP again.
NO
YES
NO
—24—
Possible Trouble  4
FAN does not operate.
Possible Trouble 5
The function of Energy Saver does not operate.
• Exchange IC01M.
• Exchange IC01M.
Is the voltage NO.2 or 3 or 4
of IC01M DC 5V?
Is the voltage NO.13 or 14 or 15
of IC01M 0V?
• Check the RY-Hi or
RY-Med or RY-Lo.
• Check the wiring diagram.
NO
NO
YES
YES
NO
NO
YES
YES
Is the Knob of SW1
set to left position?
Is the voltage No.1 of 
CN-DISP1 of Main PCB
Ass'y DC 5V?
• Reference to 
  OWNER'S MANUAL.
• Set the Knob of SW1 
  to left position.
• Check the SW1.
• Check the pattern of 
  Main & Display PCB.
Page of 52
Display

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