LG WF-SA12HD6 Service Manual ▷ View online
42
Display
Problem Diagnosis
Standard
Estimated Cause of
Abnormal Condition
Action
Lid open
(When the lid cannot
be locked)
• When the door cannot be
locked
• When the door cannot be
open
1. When there is a foreign object
in the lid lock hole
2. when lid lock unit is defect
3. When the connector connected
to the lid lock is fallen off or
contact is defect
4. When the hook is defect
5. When the lid is defect
6. When the controller is defect
• Remove the foreign object
in the lid lock hole
• Replace the lid lock
• Reconnect the connector
or correct the contact
defect
• Replace the lid
• Replace the lid
• Replace the controller
Lid locked
(When the lid cannot
be locked)
• When the door cannot be
locked
• When the door cannot be
open
1. When there is a foreign object in
the lid lock hole
2. When lid lock unit is defect
3. When the connector connected
to the lid lock is fallen off or
contact is defect
4. When the hook is defect
5. When the lid is defect
6. When the controller is defect
• Remove the foreign object
in the lid lock hole
• Replace the lid lock
• Reconnect the connector
or correct the contact
defect
• Replace the lid
• Replace the lid
• Replace the controller
Level sensor problem
(When there is a
problem with the level
sensor)
• When the frequency
generated by recognizing
level height in the pressure
switch goes out of the
standard boundary (It occurs
when the condition of the
level frequency less than
20.0KHz or over 30.0KHz is
maintained for 5 sec. or more)
1. When the connector connected
to the pressure switch or the
blue 6 pin connector is fallen off
or contact is defect
2. When the pressure switch unit
is defect
3. When the controller id defect
• Reconnect the connector
or correct the contact
defect
• Replace pressures witch
• Replace controller
•
Motor locking problem
(When there is a
problem with the motor)
• When there is a problem
with the hole sensor
detecting the rotation of
the motor
• It occurs when the motor is
locked
1. When the connector connected
to hole sensor or blue 4 pin
connector is fallen off or contact
is defect
2. When the hole sensor unit is
defect
3. When the controller is defect
4. When the motor connection
connector is fallen off or contact
is defect
5. When the bearing is locked
6. Hole sensor location defect
• Reconnect the connector or
correct the contact defect
• Replace hole sensor
• Replace controller
• Reconnect the connector or
correct the contact defect
• Turn the inner tub with hand
to check the status, and if it
cannot be rotated, replace the
bearing housing assy.
• Replace hole sensor
Clutch problem
(When there is a
problem in the clutch)
• When the clutch is not
working
1. Connection part contact defect
2. Coupling damaged
3. Pulsator locked
• Check the connection part
reconnection defect and
correct
• Disassembly the Motor and
check the damage of the
coupling (If it is damaged,
replace the part)
• Check the pulsator locking by
foreign object (Remove the
foreign object)
43
Display
Problem Diagnosis
Standard
Estimated Cause of
Abnormal Condition
Action
Coin stuck
(When there is a
problem with the motor
due to foreign object)
• Occurs when motor is
locked
1. When foreign object such as
coin, pin, or clip entered the
washing plate
• Remove the coin or foreign
object stuck between the
washer vane with pliers,
etc.
THERMISTOR
• Thermistor has a bad
connection or failed
• Check the connections at the
Thermistor and at the WHITE
3-pin connector at the main
board
• Test thermistor to determine it is
not detective
• Reseat the connector.
• Replace the thermistor if
necessary.
Power
Failure
ERROR
• The washer experienced a
power failure
• When occurred a power failure.
• When the power cord is fallen
off suddenly.
• Restart the cycle.
• Reconnect the power cord.
Drain Valve Problem
• When drain valve is not
working
• Connection part contact defect
• Check the connection part
reconnection defect and
correct.
• Replace the new drain
valve.
OVER
FLOW
ERROR
• When water is overflowed • Check the valves to be sure
there is no input leakage. Then
check the drain hose and make
sure the drain pipe is between
0.9 ~ 1.2 m (36 and 48 inches)
above the floor.
• Check for blockages and leaks
in the air hose between the tub
and the pressure switch.
• Check and repair any air
leakages at the air hose
connector on the outer tub and
at any connecting parts.
• Install the drain hose
between 0.9 ~ 1.2 m (36
and 48 inches) above the
floor.
• Replace pressure sensor
switch
• Remove the foreign
objects in pressure sensor
switch air hose.
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
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
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
Open circult of the power
supply cord
Poor connection
Wire is opened.
No defect
Poor contact
No defect
Coil is open
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 lead wire
Change the AUTO OFF
Switch
Change the
transfomerformer.
Change the fuse.
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.
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.
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