LG WF-S988TH Service Manual ▷ View online
41
2) Defects on displaying function
3) Reset During operation
Where, what & how to check?
Result of Check Possible Cause
How to repair & settle
Main voltage
1. Measure mains voltage at the wall
outlet
2. Meaure voltage at the extended
outlet that the washer is plugged in
if the extended outlet is used and
voltage at the electrical outlet
is normal in the above.
Transfomer
1. Measure the secondary voltage of
the transfomer.
Controller
1. Defect of LED.
2. Defect of LED driving circuit.
3. Defect of micom.
2. Defect of LED driving circuit.
3. Defect of micom.
Less than 85%
of the rating.
Less than 85%
of the rating
Less than
AC 10V
Low voltage.
The dia of the lead
wire is smaller or
many loads are
connected at the
same outlet
Defect of the
transfomer.
Defect of controller.
To explain that it is
caused by low voltage in
electric supply and
recommend using a
transfomer if voltage has
been continuously low.
To use a transfomer
To use a transfomer
having a enough
capacity if using
a transfomer.
Change the controller.
Change the controller.
Where, what & how to check?
Result of Check Possible Cause
How to repair & settle
Mains Voltage
1. Measure voltage of the outlet that the
washer is plugged into during wash and
spin.
2. Reset symptom happens at specific
time zone repeatedly.
3. Check whether a transfomerlent
power cut happens.
(Fluorescent lamp is
transfomeriently blinked.)
Less than
80% of the rating.
Mains voltage is too
low or size of a lead
wire is too small.
External noise
inrushed.
Explain that it is caused
by low voltage in electric
mains and recommend
using a suitable size of
leads.
Explain it is caused by
Explain it is caused by
using environment.
(It happens when
equipment with high
frequency is used
around)
Explain it is a problem of
Explain it is a problem of
electric supply
environment.
42
4) Water doesn’t come into the wash tub.
Where, what & how to check?
Result of Check Possible Cause
How to repair & settle
Inlet Valve
1. If water doesn’t come though the
inlet valve works(electric sound
occurs)
1) Check whether water mains is cut.
2) Check whether tabs are turned on.
3) HOT & COLD tab are opposite
2) Check whether tabs are turned on.
3) HOT & COLD tab are opposite
connected.
4) Wrongly select
Water Temperature option.
5) If there are no problems in the
above, check the inlet valve filters
after disconnecting the water supply
hoses.
6) If there are no problems in the
above a diaphragm hole in the valve
is blocked by foreign substance or
the plunger in it is locked.
2. If the inlet valve doesn’t work(there
is no electric sound)during filling
cycle.
1) Check whether it’s connectors are
taken off or they have poor
connection.
2) Check resistance of the inlet valve.
Water mains cut.
Don’t tumed on.
Connected
Don’t tumed on.
Connected
opposite.
Selected
Selected
opposite.
Filters blocked
Filters blocked
by foreign
substance.
A connector is
taken off.
Mains cut.
Mistake of use.
Wrong installation.
Mistake of use.
Wrong installation.
Mistake of use.
Don’t clean.
Defect of the
inlet valve.
Defect of contact.
Coil is open
Explain.
Turn on the tap.
Correct their locations
Turn on the tap.
Correct their locations
and turn on the tap.
Explain how to use.
Clean them by brush
and explain cleaning
regulary them.
Change the inlet valve.
Reconnect it or remove
the causes to make poor
connection.
Change the inlet valve.
Change the inlet valve.
Where, what & how to check?
Result of Check Possible Cause
How to repair & settle
Drain Motor
1. Operate washer setting spin only,
then press the START/PAUSE button
when the wash motor starts to work
and then press the START/PAUSE
button again in order for the drain
motor to work intermittently.
Controller
1. If mains voltage and the drain motor
1. If mains voltage and the drain motor
have no defects a defect of the
controller is highly possible.
Reset happens
after the drain
motor works.
Defect of the drain
motor (A noise
generated when the
internal relay
works.)
Change the drain motor
Change the controller.
3) Reset during operation
43
4) Water doesn’t come into the wash bowl.
5) Water fills continuously or intermittently.
Where, what & how to check?
Result of Check Possible Cause
How to repair & settle
Wrong Installation/Leakage
1. Check whether the drain hose is
1. Check whether the drain hose is
laying down on the floor.
(For pump model)
2. Check where water leaks.
Ball Pressure Sensor
(Pressure Switch)
1. Check the pulsator is rotating when
1. Check the pulsator is rotating when
water fills continuously.
2. If there is no defect in the Ball
Pressure Sensor(Pressure Switch),
check whether the air hole of the outer
tub is blocked.
Inlet Valve
1. Does water fills even though it is not
1. Does water fills even though it is not
energized (power is off)?
Controller
1. Does water fill immediately after the
1. Does water fill immediately after the
power switch turns on before pushing
the START/PAUSE button.
Drain hose
laying down.
Water leaks
from a part.
It doesn’t
rotate.
Blocked.
Water fills.
Wrong installation.
Defect of the part.
Water pressure is not
sensed.
Air hole blocked.
Defect of the inlet
valve.
Short circuit of the
triac of the
controller.
The drain hose should be
hung on the
stand-pipe or the tub.
Change the part.
Change the part.
Repair it.
Check the tube of the
Ball Pressure
Sensor(Pressure Switch),
it is bent
or blocked, repair that.
Repair the blocked hole.
Change the inlet valve.
Change the controller.
Where, what & how to check?
Result of Check Possible Cause
How to repair & settle
Ball Pressure Sensor
(Pressure Switch)
1. Is there PE error on the display
which means Ball Pressure Senosr
(Pressure Switch) error
2. Check frequency of the Ball
Pressure Sensor(Pressure Switch)
without load if wash is proceeding
without filling.
Controller
1. Defect of controller is highly possible
if inlet valve and Ball Pressure
Sensor have no defects in the above.
Reconnect the connector
or change leads. Change
the Ball Pressure Sensor
(Pressure Switch)
if coil is open.
Change the
Ball Pressure Sensor
(Pressure Switch).
Change the controller.
PE Error
displayed.
Less then
26.2
Connector is taken
off, or lead or coil is
open.
Defect of the Ball
Pressure Sensor
(Pressure Switch)
44
6) Pulsator doesn’t rotate normally.
Where, what & how to check?
Result of Check Possible Cause How to repair & settle
Pulsator rotates at one
direction.
1. The Pulsator rotates normally at the
beginning of wash cycle, but is it not
rotate at clockwise direction (locked)
after some wash cycles though there
is motor-working sound?
2. In the case the pulsator doesn’t
rotates either clockwise or
counterclockwise from the beginning
of wash cycle:
1) Check resistance of the wash
1) Check resistance of the wash
motor if there is no motor-working
sound.
2) Check belt tension & whether the
clutch rotates normally if there is
motor-working sound.
3. The pulsator doesn’t rotate at both
directions.
1) Check whether motor rotates at
1) Check whether motor rotates at
both directions if there is motor-
working sound when it’s
energized.
2) Check resistance of the motor if
there is no motor-working sound.
Clockwise
rotation locked.
Resistance
is normal.
V-belt is loose.
Clutch locked.
Motor rotates
at both
directions.
Motor doesn’t
rotates at both
directions.
Normal
resistance.
Unusual operation.
Defect of
controller or poor
contact of
connectors of
motor leads.
Loose the belt.
Defect of the
clutch.
Loose the belt.
The plusator
locked.
Defect of the
Defect of the
clutch.
Defect of the
Defect of the
capacitor.(check
the capacitor’s
capacitance)
Defect of the
Defect of the
motor.
Motor coil is open.
Contact defect of
the leads.
Turn the power off
and on again then that
symptom disappears.
Explain “Don’t run wash
only continuously”.
Change the controller if
there are no contact
defects in the leads of
the motor.
Adjust belt tension by
changing motor fixing
location and change the
belt if it is impossible to
adjust belt tension.
Change the clutch if the
Change the clutch if the
clutch pulley is locked
when making it rotated
clockwise and
counterclockwise by
hand.
Adjust belt tension or
Adjust belt tension or
change the belt if it is
impossible to adjust.
Remove cause
Remove cause
locking the pulsator
Change the clutch.
Change the clutch.
Change the motor if the
motor is locked when
having its shaft rotated
by hand.
Change the capacitor if
Change the capacitor if
there is no contact defect
in capacitor’s lead
Change the motor.
Change the motor.
Remove the causes.
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