LG WT5101HW Service Manual ▷ View online
37
1) Washer is not energized.
Where, what, and how to check
Result of Check
Possible Cause
How to repair
Household Power supply
1. Check the cord, plug, and outlet.
2. Measure the voltage at the outlet.
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 every connector for a loose
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 for blown fuse.
Controller
If all the components test good, the defect
is likely the main control board.
is likely the main control board.
Poor
120 VAC ± 10%
0 V
Less than 1
Ω
∞Ω
Male & female
connectors separated
connectors separated
∞Ω
Less than 0.5
Ω
More than 1.0
Ω
10~14 V
0 V
Open
Over 120% voltage
than rating check
than rating check
Electrical defect.
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
Blown fuse
Note: US appliances are
120 VAC except for
stoves, ranges, ovens,
cooktops, and certain air
conditioners.
Note: US appliances are
120 VAC except for
stoves, ranges, ovens,
cooktops, and certain air
conditioners.
Repair or replace as
necessary.
necessary.
Call for power supply
company
company
Change the power supply
cord.
cord.
Unplug and re-insert the
connector.
connector.
Change the lead wire
Change the AUTO OFF
Switch
Switch
Replace the transformer.
Change the fuse.
CAUTION
Check the fuse rating.
125 VAC 12 AMPS
CAUTION
Check the fuse rating.
125 VAC 12 AMPS
Replace the main board if all
the electrical components
test good.
the electrical components
test good.
4-7. HOW TO DIAGNOSE AND REPAIR BY SYMPTOM
38
2) Defects on displaying funcion
2) Defects on displaying funcion
When, what, and how to check
Result of Check
Possible Cause
How to repair
Main voltage
1. Measure voltage at wall outlet.
Controller
1. Defective LED.
2. Defective LED driver circuit.
3. Defective Microprocessor.
2. Defective LED driver circuit.
3. Defective Microprocessor.
Expect 120 VAC ±
10%. If below 108
VAC, consult an
electrician or your
local power provider.
10%. If below 108
VAC, consult an
electrician or your
local power provider.
Low voltage
Defective main board.
If incoming line voltage is
below 108 VAC, consult an
electrician or your local
power provider.
below 108 VAC, consult an
electrician or your local
power provider.
Replace the main board.
3) Reset During operation
When, what, and how to check
Result of Check
Possible Cause
How to repair
Main voltage
1. Measure voltage of the outlet that the
washer is plugged into during wash and
spin.
spin.
2. The reset event occurs at about the
same time every day.
3. Check for line noise sources inside the
house.
Controller
1. If the input voltage is correct and the
pump works properly, the main board is
probably defective.
probably defective.
Less than 90% of the
rating.
rating.
Input voltage is too low or
the house wiring is
insufficient for the load.
the house wiring is
insufficient for the load.
Noise or spurious
signals are introduced to
the controller through the
power input.
power input.
Consult an electrician.
This could be caused by
something outside the home.
It is possible that a surge
protector / line filter would
help reduce the incidence.
something outside the home.
It is possible that a surge
protector / line filter would
help reduce the incidence.
Explain it is a problem of
electric supply
environment.
electric supply
environment.
Replace the main board.
39
4) Water doesn’t come into the wash tub.
When, what, and how to check
Result of Check
Possible Cause
How to repair
Inlet Valve
1. If you hear the valve noise but get no
water, check to see if the water is turned
off outside the house.
off outside the house.
2) Check to see if taps are opened.
3) Hot and cold hoses are reversed.
4) Incorrect water temperature selected.
5) If items above check out OK, turn off the
water, remove the hoses, and check the
grit filters.
grit filters.
6) If everything checks out this far, check
the vent hole in the pressure switch for
blockage and make sure the plunger
can move freely.
blockage and make sure the plunger
can move freely.
2. If the inlet valve fails (no clicking or
buzzing) when the washer should be
filling, check the connectors on each
valve and at the main board.
filling, check the connectors on each
valve and at the main board.
2) Check resistance of the inlet valve.
Pressure Switch
1. Does the display show a PE error code?
2. Use TEST MODE to read the frequency
of the pressure switch while filling an
empty washer.
empty washer.
Controller
1. If the pressure switch and inlet valves
test good, the problem is probably a
defective main board.
defective main board.
No water coming
from taps.
from taps.
Tap is closed.
Incorrect installation.
Select correct temp.
Grit, sand, and
foreign substances
plugging filter.
foreign substances
plugging filter.
Loose connection.
∞Ω
PE Error displayed.
Less then 26.2 kHz
Water main turned off.
User error.
Incorrect installation.
User error.
Normal sediment in water
supply.
supply.
Water inlet valve(s)
defective.
defective.
Loose connection.
Coil is open
Connector is loose, wire is
broken, or the pressure
switch is defective.
broken, or the pressure
switch is defective.
Pressure switch is
defective.
defective.
Explain.
Turn on the tap.
Reconnect hoses to correct
taps.
taps.
Read and understand
manual.
manual.
Remove the filters, clean
them with a small brush, and
replace them.
them with a small brush, and
replace them.
Replace the inlet valves.
Remove and replace the
connector(s).
connector(s).
Replace the valve.
Remove and replace the
connector. If this does not
resolve the issue, replace the
pressure switch.
connector. If this does not
resolve the issue, replace the
pressure switch.
Replace the pressure switch.
Replace the main board.
40
5) Water fills continuously of intermittently
When, what, and how to check
Result of Check
Possible Cause
How to repair
Wrong Installation/Leakage
1. Check to see that the drain hose is
properly installed in a standpipe.
2. Figure where the leak is starting.
Pressure Switch
1. Verify the pulsator is rotating while water
is filling the tub.
2. If the pressure switch tests good, verify
the vent hols on the tub's air chamber is
not blocked.
not blocked.
Inlet Valve
1. Water comes in though the inlet valve
even when the washer is unplugged.
Controller
1. Water fills the washer immediately when
the washer is turned on, even before
pushing the START button.
pushing the START button.
Drain hose is fallen
and lying on the floor.
and lying on the floor.
Water leaks from a
part.
part.
No rotation.
Blocked.
Water fills.
Incorrect installation.
Defective part.
Water level is not
detected.
detected.
Detergent buildup or a
foreign object is blocking
airflow.
foreign object is blocking
airflow.
Inlet valve is defective.
The triac has failed on the
main board.
main board.
Install the drain hose in a
standpipe that is between 36
~ 46 inches (0.9 ~ 1.2 m)
from the floor.
standpipe that is between 36
~ 46 inches (0.9 ~ 1.2 m)
from the floor.
Repair or replace the part.
Check the pressure switch
tube to verify it is not kinked,
bent, blocked, or cut. Repair
it as necessary.
tube to verify it is not kinked,
bent, blocked, or cut. Repair
it as necessary.
Unstop it.
Replace the valve.
Replace the main board.
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