LG WT-SD173HVG Service Manual ▷ View online
41
ERROR
OVER
FLOODING
ERROR
PRESSURE
SENSOR
MOTOR
ERROR
Water Pressure
Switch is off.
Switch is off.
Check water leakage or
whether the drain hose is
hung on to drainage which is
0.9 m obove from floor.
Check blockage of air hole
or air tube.
Check &repair air leakage at
the air hole of outer tub the
air tube or connection parts.
whether the drain hose is
hung on to drainage which is
0.9 m obove from floor.
Check blockage of air hole
or air tube.
Check &repair air leakage at
the air hole of outer tub the
air tube or connection parts.
Connector the PRESSURE
S/W ASM or BLUE 4 pin
connector to P.W.B ASM has
bad connection.
PRESSURE S/W is bad. (In
the initial state of QC TEST
MODE, the number on the
DISPLAY is less than 60 or
more than 104)
S/W ASM or BLUE 4 pin
connector to P.W.B ASM has
bad connection.
PRESSURE S/W is bad. (In
the initial state of QC TEST
MODE, the number on the
DISPLAY is less than 60 or
more than 104)
Connector the HALL Sensor
or Natural 6 Pin connector
to P.W.B ASM had bad
connection .
Connector the stator ASM,
and YELLOW 3 Pin or
Natural 6 Pin connector to
P.W.B ASM had bad
connection
Hall sensor is bad.
Locked by Bearing Housing
or Natural 6 Pin connector
to P.W.B ASM had bad
connection .
Connector the stator ASM,
and YELLOW 3 Pin or
Natural 6 Pin connector to
P.W.B ASM had bad
connection
Hall sensor is bad.
Locked by Bearing Housing
Hang drain hose which is
minimum 0.9m above from
floor.
Replace pressure sensor
switch
Remove the foreign objects
in pressure sensor switch
minimum 0.9m above from
floor.
Replace pressure sensor
switch
Remove the foreign objects
in pressure sensor switch
Correct the connector
contact.
contact.
Replace PRESSURE S/W
ASM.
ASM.
Correct the connect contact.
Change Stator ASM.
Change Bearing Housing
ASM.
Change P.W.B ASM.
Change Stator ASM.
Change Stator ASM.
Change Bearing Housing
ASM.
Change P.W.B ASM.
Change Stator ASM.
ERROR DECISION
BASIS
CAUSE FOR ERROR
OCCURRENCE
REMEDY
42
4-8. 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.
plug pins short-circuited.
2. Check whether every connector in the
bundle of connectors has a good
connection.
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.
it should be defect of the controller.
Poor
Around rating
0 V
Less than 1
∞
Male & female
connectors separated
connectors separated
∞
Less than 0.5
More than 1.0
10~14 V
0 V
Open
Over 120% voltage
than rating check
than rating check
Change the controller if all
the electrical parts have no
defects.
the electrical parts have no
defects.
Defect of the electrical
No defect
Defect of household
power supply
power supply
No defect
Open circult of the power
supply cord
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
company
Change the power supply
cord.
cord.
Remove the cause to give
strain and reconnect
them.
strain and reconnect
them.
Change the lead wire
Change the AUTO OFF
Switch
Switch
Change the
transfomerformer.
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
43
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.
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
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
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.
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.
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.
spin.
2. Reset symptom happens at specific time
zone repeatedly.
3. Check whether a transfomerlent power
cut happens. (Fluorescent lamp is
transfomeriently blinked)
transfomeriently blinked)
Controller
1. If mains voltage and the drain motor
have no defects a defect of the controller
is highly possible.
is highly possible.
Less than 80% of the
rating.
rating.
Mains voltage is too low
or size of a lead wire is
too small.
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.
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.
Change the controller.
Where, what & how to check?
PE Error displayed.
Less then 26.2 kHz
44
Pressure Switch
1. Is there PE error on the display which
means Ball Pressure Senosr (Pressure
Switch) error
Switch) error
2. Check frequency of the Ball Pressure
Sensor(Pressure Switch) without load if
wash is proceeding without filling.
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.
have no defects in the above.
Connector is taken off, or
lead or coil is open.
lead or coil is open.
Defect of the Ball Pressure
Sensor (Pressure Switch)
Sensor (Pressure Switch)
Reconnect the connector or
change leads. Change the
Ball Pressure Sensor
(Pressure Switch) if coil is
open.
change leads. Change the
Ball Pressure Sensor
(Pressure Switch) if coil is
open.
Change the Ball Pressure
Sensor (Pressure Switch).
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.
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.
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 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
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.
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