DOWNLOAD LG LWC1260ACG Service Manual ↓ Size: 3.43 MB | Pages: 127 in PDF or view online for FREE

Model
LWC1260ACG
Pages
127
Size
3.43 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
lwc1260acg.zip
Date

LG LWC1260ACG Service Manual ▷ View online

3.3 TROUBLE SHOOTING GUIDE 
In general, possible trouble is classified by two causes. 
The one is called Starting Failure which is caused by an electrical defect, and the other is Ineffective Air Condi-
tioning 
caused by a defect in the refrigeration circuit and improper application.  
Unit runs but ineffective cooling. 
—16—
Ineffective Cooling
Satisfactory operation with 
temperature difference of 
inlet & outlet air ;  7~10°C 
Replacement of unit if the
unit is beyond repair. 
Check outdoor coil 
(heat exchanger) & the fan
operation. 
Check heat load increase.
Check cold air circulation for
smooth flowing.
Check refrigerant leakage.  
Unexpected residue
Added electrical utensil
Check inside refrigerant
pressure. 
Adjusting of refrigerant 
charge. 
Malfunction of compressor. 
Replacement of compres-
sor. 
Check clogging in refrigera-
tion circuit. 
Repair clogging in refrigera-
tion circuit. 
Dirty indoor coil 
(heat exchanger) 
Repair refrigerant leak. 
Malfunction of fan.  
Clogging of air filter. 
Obstruction at air outlet. 
Correct above trouble
—17—
Fails to Start 
Improper wiring. 
Improper thermostat setting. 
Loose terminal connection.
Check power source. 
Drop in power voltage. 
Capacitor check. 
Replacement. 
Check control switch 
setting. 
Compressor only fails to 
start. 
Defect of compressor
capacitor.
Replacement of compressor
(Motor damaged).
Irregular motor insulation (
§
)
Irregular motor resistance (
§
)
Regular but fails to start. 
Replacement of compressor
(locking of rotor, metal).
Check circuit breaker 
and fuse. 
Gas leakage in feeler bulb
of thermostat. 
Check control switch. 
Fan only fails to start. 
Improper wiring. 
Defect of fan motor capaci-
tor.
Replacement of fan motor.
Irregular motor resistance
(
§
).
Irregular motor insulation
(
§
).
—18—
COMPLAINT 
CAUSE 
REMEDY 
Fan motor will not run. 
No power 
Check voltage at outlet. Correct if none. 
Power supply cord 
Check voltage to rotary switch. If none, check 
power supply cord. Replace cord if circuit is open.
Rotary switch 
Check switch continuity. Refer to wiring diagram 
for terminal identification. Replace switch if none. 
Wire disconnected or 
Connect wire. Refer to wiring diagram for terminal 
connection loose 
identification. Repair or replace loose terminal. 
Capacitor. (Discharge 
Test capacitor. 
capacitor before testing.) 
Replace if not within 
¡
10% of manufacturer’s 
See section 2.1.3. 4
rating. Replace if shorted, open, or damaged. 
Will not rotate 
Fan blade hitting shroud or blower wheel hitting 
scroll. Realign assembly. 
Units using slinger ring condenser fans must 
have 
1
/
4
to 
5
/
16
inch clearance to the base. If it is 
hitting the base, shim up the bottom of the fan 
motor with mounting screw(s). 
Check fan motor bearings, if motor shaft will not 
rotate, replace the motor. 
Fan motor runs inter- 
Revolves on overload. 
Check voltage. See limits on this page. If not with- 
mittently.
in limits, call an electrician.
Test capacitor. 
Check bearings. Does the fan blade rotate freely? 
If not, replace fan motor. 
Pay attention to any change from high speed to 
low speed. If the speed does not change, replace
the motor. 
Fan motor noise.  
Grommets 
Check grommets; if worn or missing, replace them. 
Fan 
If cracked, out of balance, or partially missing, 
replace it. 
Blower 
If cracked, out of balance, or partially missing, 
replace it. 
Loose set screw 
Tighten it. 
Worn bearings 
If knocking sounds continue when running or 
loose, replace the motor. If the motor hums or 
noise appears to be internal while running, 
replace motor.
—19—
COMPLAINT 
CAUSE 
REMEDY 
Compressor will not run,
Voltage 
Check voltage. See the limits on page 3.
but fan motor runs. 
If not within limits, call an electrician. 
Wiring 
Check the wire connections, if loose, repair or 
replace the terminal. If wires are off, refer to wiring 
diagram for identification and replace. Check wire 
locations. If not per wiring diagram, correct.
Rotary 
Check for continuity; refer to the wiring diagram 
for terminal identification. Replace the switch if 
circuit is open. 
Thermostat 
Check the position of knob. If not at the coldest 
setting, advance the knob to this setting and 
restart unit. 
Check continuity of the thermostat. Replace 
thermostat if circuit is open. 
Capacitor (Discharge 
Check the capacitor. 
capacitor before servicing.)
Replace if not within
¡
10% of manufacturer’s 
See section 2.1.3. 4
rating. Replace if shorted, open, or damaged. 
Compressor 
Check the compressor for open circuit or 
ground. If open or grounded, replace the 
compressor. 
Overload 
Check the compressor overload if externally 
mounted. Replace if open. (If the compressor 
temperature is high, remove the overload, cool 
and retest.) 
Compressor cycles
Voltage 
Check the voltage. See the limits on the preced-
on overload. 
ing page. If not within limits, call an electrician.
Overload 
Check overload. If externally mounted. 
Replace if open. (If the compressor temperature 
is high, remove the overload, cool, and retest.) 
Compressor cycles on 
Fan motor 
If not running, determine the cause. Replace if 
overload (Cont'd)
required. 
Condenser air flow 
Remove the cabinet, inspect the interior surface 
restriction. 
of the condenser, if restricted, clean carefully
with a vacuum cleaner or brush (do not damage 
fins). Clean the interior base before reassembling.
Condenser fins
If condenser fins are closed over a large area 
(damaged).
on the coil surface, head pressures will increase,
causing the compressor to cycle. Straighten the
fins or replace the coil. 
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