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.
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.
and fuse.
Gas leakage in feeler bulb
of thermostat.
of thermostat.
Check control switch.
Fan only fails to start.
Improper wiring.
Defect of fan motor capaci-
tor.
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.
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.
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.
scroll. Realign assembly.
Units using slinger ring condenser fans must
have
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).
motor with mounting screw(s).
Check fan motor bearings, if motor shaft will not
rotate, replace the motor.
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.
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.
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.
replace it.
Blower
If cracked, out of balance, or partially missing,
replace it.
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.
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.
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.
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.
setting, advance the knob to this setting and
restart unit.
Check continuity of the thermostat. Replace
thermostat if circuit is open.
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.
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.)
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.)
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.
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.
causing the compressor to cycle. Straighten the
fins or replace the coil.
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