LG WTL-7KG10 / T7017TEFT4 Service Manual ▷ View online
36
4-9. HOW TO DIAGNOSE AND REPAIR BY SYMPTOM
1) Washer is not energized.
Where, what & how to check?
Result of Check
Possible Cause
How to repair & settle
Household Power supply
1. Check whether connection between
the plug and the electrical is poor
2. Measure voltage of the electrical.
Wiring of the W
asher
1. Measure resistance between both
ends of the power supply cord with
both the plug pins short-circuited.
both the plug pins short-circuited.
2. Check whether every connector in
the bundle of connectors has a
good connection.
good connection.
3. Check resistance of every wire to
find out a open wire.
Electrical component
1. Check resistance with power relay
switch turned on
2. Check the secondary voltage of the
transfomer.
3. Measure resistance to check
whether the T.P of the motor is
blown out.
blown out.
4. Check whether the fuse is open.
Controller
If there are no defects in the above,
it should be defect of the controller.
If supply voltage is 120% higher than
rating the varistar in the controller may
be broken. Check supply voltage.
rating the varistar in the controller may
be broken. Check supply voltage.
Poor
Around rating
0V
Less than 1
Male & female
connectors
separated
connectors
separated
Less than 0.5
More than 1.0
10~14V
0V
motor is hot
Open
Over 120%
voltage than
rating check
voltage than
rating check
Defect of the
electrical
electrical
No defect
Defect of household
power supply
power supply
No defect
Open circuit of the
power supply cord
power supply cord
Poor connection.
Wire is opened.
No defect
Poor contact
No defect
Coil is open
T.P blown out
Defect of the fuse
Change the electrical.
Call for power supply
company
company
Change the power
supply cord.
supply cord.
Remove the cause to
give strain and
reconnect them.
give strain and
reconnect them.
Change the lead wire.
Change the Auto Off
Switch
Switch
Change the
transfomerformer.
Remove cause to
overload the motor
overload the motor
Change the fuse.
CAUTION
Check the fuse rating
AC100~127V:125V 12A
AC220~240V:250V 6A
CAUTION
Check the fuse rating
AC100~127V:125V 12A
AC220~240V:250V 6A
Change the controller
if all the electrical parts
have no defects.
if all the electrical parts
have no defects.
37
2) Defects on displaying function
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
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.
of the rating.
Less than 85%
of the rating
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
wire is smaller or
many loads are
connected at the
same outlet
Defect of the
transfomer.
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.
caused by low voltage in
electric supply and
recommend using a
transfomer if voltage has
been continuously low.
To use a transfomer
having a enough
capacity if using
a transfomer.
having a enough
capacity if using
a transfomer.
Change the controller.
Change the controller.
3) Reset During operation
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.
spin.
2. Reset symptom happens at specific
time zone repeatedly.
3. Check whether a transfomerlent
power cut happens.
(Fluorescent lamp is
transfomeriently blinked.)
(Fluorescent lamp is
transfomeriently blinked.)
Less than
80% of the rating.
80% of the rating.
Mains voltage is too
low or size of a lead
wire is too small.
low or size of a lead
wire is too small.
External noise
inrushed.
inrushed.
Explain that it is caused
by low voltage in electric
mains and recommend
using a suitable size of
leads.
by low voltage in electric
mains and recommend
using a suitable size of
leads.
Explain it is caused by
using environment.
(It happens when
equipment with high
frequency is used
around)
using environment.
(It happens when
equipment with high
frequency is used
around)
Explain it is a problem of
electric supply
environment.
electric supply
environment.
38
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)
occurs)
1) Check whether water mains is cut.
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
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.
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.
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
opposite.
opposite.
Selected
opposite.
opposite.
Filters blocked
by foreign
substance.
by foreign
substance.
A connector is
taken off.
taken off.
Mains cut.
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
and turn on the tap.
and turn on the tap.
Explain how to use.
Clean them by brush
and explain cleaning
regulary them.
and explain cleaning
regulary them.
Change the inlet valve.
Reconnect it or remove
the causes to make poor
connection.
the causes to make poor
connection.
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.
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
have no defects a defect of the
controller is highly possible.
controller is highly possible.
Reset happens
after the drain
motor works.
after the drain
motor works.
Defect of the drain
motor (A noise
generated when the
internal relay
works.)
motor (A noise
generated when the
internal relay
works.)
Change the drain motor
Change the controller.
3) Reset during operation
39
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
laying down on the floor.
(For pump model)
2. Check where water leaks.
Ball Pressure Sensor
(Pressure Switch)
(Pressure Switch)
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.
check whether the air hole of the outer
tub is blocked.
Inlet Valve
1. Does water fills even though it is not
energized (power is off)?
Controller
1. Does water fill immediately after the
power switch turns on before pushing
the start/pause button.
the start/pause button.
Drain hose
laying down.
laying down.
Water leaks
from a part.
from a part.
It doesn’t
rotate.
rotate.
Blocked.
Water fills.
Wrong installation.
Defect of the part.
Water pressure is not
sensed.
sensed.
Air hole blocked.
Defect of the inlet
valve.
valve.
Short circuit of the
triac of the
controller.
triac of the
controller.
The drain hose should be
hung on the
stand-pipe or the tub.
hung on the
stand-pipe or the tub.
Change the part.
Repair it.
Check the tube of the
Ball Pressure
Sensor(Pressure Switch),
it is bent
or blocked, repair that.
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)
(Pressure Switch)
1. Is there PE error on the display
which means Ball Pressure Senosr
(Pressure Switch) error
(Pressure Switch) error
2. Check frequency of the Ball
Pressure Sensor(Pressure Switch)
without load if wash is proceeding
without filling.
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.
Sensor have no defects in the
above.
Reconnect the connector
or change leads. Change
the Ball Pressure Sensor
(Pressure Switch)
or change leads. Change
the Ball Pressure Sensor
(Pressure Switch)
if coil is open.
Change the
Ball Pressure Sensor
(Pressure Switch).
Ball Pressure Sensor
(Pressure Switch).
Change the controller.
PE Error
displayed.
displayed.
Less then
26.2
26.2
Connector is taken
off, or lead or coil is
open.
off, or lead or coil is
open.
Defect of the Ball
Pressure Sensor
(Pressure Switch)
Pressure Sensor
(Pressure Switch)
Click on the first or last page to see other WTL-7KG10 / T7017TEFT4 service manuals if exist.