DOWNLOAD LG WF-SA12HD6 Service Manual ↓ Size: 12.82 MB | Pages: 57 in PDF or view online for FREE

Model
WF-SA12HD6
Pages
57
Size
12.82 MB
Type
PDF
Document
Service Manual
Brand
Device
Washing Machine
File
wf-sa12hd6.pdf
Date

LG WF-SA12HD6 Service Manual ▷ View online

44
4-6. 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 Washer
1. Measure resistance between both ends
of the power supply cord with both the
plug pins short-circuited.
2. Check whether every connector in the
bundle of connectors has a 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. Check whether the fuse is open.
Controller
If there are no defects in the above, 
it should be defect of the controller.
Poor
Around rating
0 V 
Less than 1
Male & female
connectors separated
Less than 0.5
More than 1.0 
10~14 V
0 V
Open
Over 120% voltage
than rating check
Change the controller if all
the electrical parts have no
defects.
Defect of the electrical
No defect
Defect of household
power supply
No defect
Open circult of the power
supply cord
Poor connection
Wire is opened.
No defect
Poor contact
No defect
Coil is open
Defect of the fuse
Change the electrical.
Call for power supply
company
Change the power supply
cord.
Remove the cause to give
strain and reconnect
them.
Change the lead wire
Change the AUTO OFF
Switch
Change the
transfomerformer.
Change the fuse.
CAUTION
Check the fuse rating
AC100~127V:125V 12A
AC220~240V:250V 6A
45
2) Defects on displaying funcion
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.
Controller
1. Defect of LED.
2. Defect of LED driving circuit.
3. Defect of micom.
Less than 85% of the
rating
Less than 85% of the
rating
Low voltage
The dia of the lead wire is
smaller or many loads are
connected at the same
outlet
Defect of controller.
Change the 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
having a enough capacity
if using a transfomer.
3) Reset During operation
Where, what & how to check?
Result of Check
Possible Cause
How to repair & settle
Main 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)
Controller
1. If mains voltage and the drain motor
have no defects a defect of the controller
is highly possible.
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
using environment.
(It happens when
equipment with high
frequency is used
around)
Explain it is a problem of
electric supply
environment.
Change the controller.
46
Where, what & how to check?
PE Error displayed.
Less then 26.2 kHz
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.
Connector is taken off, or
lead or coil is open.
Defect of the Ball Pressure
Sensor (Pressure Switch)
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.
4) Water doesn’t come into the wash tub.
Result of Check
Possible Cause
How to repair & settle
Water mains cut.
Dont tumed on.
Connected opposite.
Selected opposite.
Filters blocked by
foreign substance.
A connector is taken
off.
∞ Ω
Mains cut.
Mistake of use.
Wrong installation.
Mistake of use.
Donʼt 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.
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.
Inlet Valve
1. If water doesnʼt 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
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 itʼs connectors are taken
off or they have poor connection.
2) Check resistance of the inlet valve.
47
5) Water fills continuously of 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. 
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.
Drain hose laying
down.
Water leaks from a
part.
It doesnʼt 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.
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.
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