DOWNLOAD LG LWB0760ACG / LWB0811CCL Service Manual ↓ Size: 1.26 MB | Pages: 36 in PDF or view online for FREE

—26—

If not running, determine the cause. Replace if
required.

Remove the cabinet, inspect the interior surface of
the condenser. If restricted, clean carefully with a
vacuum cleaner (do not damage fins) or brush.
Clean the interior base before re-assembling.

If the condenser fins are closed over a large area on
the coil surface, head pressures will increase,
causing the compressor to cycle.
Straighten the fins or replace the coil.

Test the capacitor.

Check the terminals. If loose, repair or replace.

Check the system for a restriction.

If restricted, clean or replace.

Close if open.

Determine if the unit is properly sized for the area to
be cooled.

Check the set screw, or clamp. If loose or missing,
correct. If the blower or fan is hitting scroll or barrier,
rearrange the air handling parts.

Remove the cabinet and carefully rearrange the
tubing not to contact the cabinet, compressor,
shroud and barrier.

Fan motor

Condenser air flow
restriction

Condenser fins
(damaged)

Capacitor

Wiring

Refrigeration system

Air filter

Exhaust damper door

Unit undersized

Blower or fan

Copper tubing

Compressor cycles on
overload

Insufficient cooling

Excessive noise

—18—

In general, possible trouble is classified in two kinds.
The one is called Starting Failure which is caused from an electrical defect. The other is Ineffective Air
Conditioning caused by a defect in the refrigeration circuit and improper application.

Check of outdoor coil
(heat exchanger) & fan
operation.

Check gas leakage.

Repair gas leak.

Replacement of unit if the
unit is beyond repair.

Satisfactory operation with
temperature difference of
inlet & outlet air ; 
44~50°F(7~10°C) 

Check heat load 
increase.

Clean condenser.

Not on separate circuit

Check inside gas
pressure.

Adjusting of refrigerant
charge

Malfunction of compressor

Replacement of
compressor

Check of cold  air circulation
 for smooth flow.

Dirty indoor coil
(Heat exchanger)

Remove obstruction.

Check clogging in 
refrigeration circuit.

Repair clogging in 
refrigeration circuit.

Obstruction at air outlet

Clogged of air filter

Malfunction of fan

—19—

Check of circuit breaker
and fuse.

Gas leakage of feeler bulb
of thermostat

Check of control switch.

Only fan fails to start.

Improper wiring

Defect of fan motor
capacitor

Resistance irregular motor 
(    ).
Insulation irregular motor 
(    ).

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

 Check capacitor.

Replacement

Only compressor fails to
start.

Defect of compressor
capacitor

Check of power source.

Check of control switch
setting.

—20—

Is the Trans output power

AC 220V?

Is the Trans output power

about AC 13V?

Is shorted the Trans. output?

Is output Voltage of IC2

DC 12V?

Is output Voltage of IC3

DC 5V?

Is the voltage No.20 of IC1

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 

IC1 is 5V.)

• Check the Fuse.
• Check the wiring diagram.

• Check the Main 
  PCB pattern.

• Exchange the Trans.

• Exchange BD1.

• Exchange IC2.

• Exchange IC3.

• Exchange IC4, C07.

• Connect connector
  exactly.

• Check the PCB 
  pattern.

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

YES

YES

YES

NO

YES

• The unit does not operate.