LG WT-W7111TH Service Manual ▷ View online
32
12-2.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.
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
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 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.
12-3.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.
33
12-4. 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.
12-3.Reset During operation
Where, what & how to check?
Result of Check
Possible Cause
How to repair & settle
Controller
1. If mains voltage and the drain motor
have no defects a defect of the
controller is highly possible.
controller is highly possible.
Change the controller.
34
12-5. 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.
Pressure Switch
1. Check the pulsator is rotating when
water fills continuously.
2. If there is no defect in the pressure
swith, check whether the air hole of
the outer tub is blocked.
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.
not 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.
should be hung on the
stand-pipe or the tub.
Change the part.
Repair it.
Check the tube of the
pressure swith,if it is bent
or blocked, repair that.
pressure swith,if it is bent
or blocked, repair that.
Repair the blocked hole.
Change the inlet valve.
Change the controller.
12-4. Water doesn’t come into the wash bowl.
Where, what & how to check?
Result of Check
Possible Cause
How to repair & settle
Pressure Switch
1. Is there PE error on the display
which means pressure switch error
2. Check frequency of the pressure
switch without load if wash is
proceeding without filling.
proceeding without filling.
Controller
1. Defect of controller is highly possible
if inlet valve and pressure switch have
no defects in the above.
if inlet valve and pressure switch have
no defects in the above.
Reconnect the connector
or change leads. Change
the pressure switch if coil
is open.
or change leads. Change
the pressure switch if coil
is open.
Change the pressure
switch.
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
pressure switch.
pressure switch.
35
12-6. Display “LE” message and doesn’t work
Where, what & how to check?
Result of Check
Possible Cause How to repair & settle
1. In initial state display “LE” message.
1) Measure voltage of hall sensor
asm.
2) Check resistance of the motor.
Gray-White
DC 15V
DC 15V
OV
Gray-Red
-Blue
DC 12V
OV
Normal
Resistance
Resistance
No defect
Poor
No defect
Poor
Motor coil is
open.
open.
Contact lefect of
the leack
the leack
Change the PCB Asm
Change the PCB Asm
Change the motor
Remove the cause
WH
Hall
sensor asm
DC 15V
In PCB asm
Gray (Ground)
BL
RD
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