LG WF-L750TC / WF-L801TC / WF-L880NTC Service Manual ▷ View online
37
4) Water doesn’t come into the wash bowl.
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.
Ball Pressure Sensor
1. Check the pulsator is rotating when
water fills continuously.
2. If there is no defect in the Ball
Pressure Sensor, check whether the
air hole of the outer tub is blocked.
Inlet V alve
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 doesn ’t
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.
Change the part.
Repair it.
Check the tube of the
Ball Pressure Sensor, it
is bent
or blocked, repair that.
Repair the blocked hole.
Change the inlet valve.
Change the controller.
Where, what & how to check?
Result of Check Possible Cause
How to repair & settle
Ball Pressure Sensor
1. Is there PE error on the display
which means Ball Pressure Senosr
error
2. Check frequency of the Ball
Pressure Sensor 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.
Reconnect the connector
or change leads. Change
the Ball Pressure Sensor
if coil is open.
Change the pressure
Change the pressure
switch.
Change the controller.
PE Error
displayed.
Less then
26.2
26.2
Connector is taken
off, or lead or coil is
open.
Defect of the Ball
Pressure Sensor
38
6) Pulsator doesn’t rotate normally.
Where, what & how to check?
Result of Check Possible Cause How to repair & settle
Pulsator rotates at one
direction .
1. The Pulsator rotates normally at the
beginning of wash cycle, but is it not
rotate at clockwise direction (locked)
after some wash cycles though there
is motor-working sound?
2. In the case the pulsator doesn ’t
rotates either clockwise or
counterclockwise from the beginning
of wash cycle:
1) Check resistance of the wash
1) Check resistance of the wash
motor if there is no motor-working
sound.
2) Check belt tension & whether the
clutch rotates normally if there is
motor-working sound.
3. The pulsator doesn ’t rotate at both
directions.
1) Check whether motor rotates at
1) Check whether motor rotates at
both directions if there is motor-
working sound when it ’s
energized.
2) Check resistance of the motor if
there is no motor-working sound.
Clockwise
rotation locked.
Resistance
is normal.
V-belt is loose.
Clutch locked.
Motor rotates
at both
directions.
Motor doesn ’t
rotates at both
directions.
Normal
resistance.
Unusual operation.
Defect of
controller or poor
contact of
connectors of
motor leads.
Loose the belt.
Defect of the
clutch.
Loose the belt.
The plusator
locked.
Defect of the
Defect of the
clutch.
Defect of the
Defect of the
capacitor.(check
the capacitor ’s
capacitance)
Defect of the
motor.
Defect of the
motor.
Motor coil is open.
Contact defect of
the leads.
Turn the power off
and on again then that
symptom disappears.
Explain “Don’t run wash
only continuously ”.
Change the controller if
there are no contact
defects in the leads of
the motor.
Adjust belt tension by
changing motor fixing
location and change the
belt if it is impossible to
adjust belt tension.
Change the clutch if the
Change the clutch if the
clutch pulley is locked
when making it rotated
clockwise and
counterclockwise by
hand.
Adjust belt tension or
Adjust belt tension or
change the belt if it is
impossible to adjust.
Remove cause
Remove cause
locking the pulsator
Change the clutch.
Change the clutch.
Change the motor if the
motor is locked when
having its shaft rotated
by hand.
Change the capacitor if
Change the capacitor if
there is no contact defect
in capacitor ’s lead
Change the motor.
Remove the causes.
39
7) Water does not drain.
Where, what & how to check?
Result of Check Possible Cause How to repair & settle
4. Check whether the drain hose is
blocked by foreign objects. It may
happen in case of the hose is a little
kinked.
PV Case
(for Non-Pump Model only)
1. Check whether the PV asm is
blocked by foreign objects.
Drain Motor
(For Non-Pump Model only)
1. Check resistance of the drain
motor if it can not pull the PV link.
Blocked.
Blocked.
Resistance is
normal.
Blocked hose.
Drain motor coil is
open.
Contact defect in
connection parts
or defect of the
controller.
Remove the objects and
reinstall so that it can ’t
be kinked.
Separate the drain motor
from the PV link,
disassemble PV cover
and then remove the
foreign objects within
PV case.
Check the washer works
normally after repair
and reassembling them.
(PV link & drain motor
lever should be
assembled accuratel.)
Change the drain motor
Check the washer
works normally after
reassembling.
(PV link & drain motor
lever should be
assembled accurately.)
Change the controller if
there is no defects in the
connection parts.
40
8) Water drains though it is not the time of drain.
Where, what & how to check?
Result of Check Possible Cause How to repair & settle
Drain Motor
(for Non-Pump Model only)
1. Check whether the drain motor is
normally returned after turning
power off.
(It is considered normal if the lever
of the drain motor is fully pulled out
by the PV spring)
PV Case
1. If water drains though the drain
motor is normally returned, check
whether PV asm is blocked by
foreign objects or the bellows in
the PV asm is deformed.
Controller
1. Check whether the drain motor or
the drain pump works immediately
after power is turned on.
Blocked.
Blocked.
Bellows
deformed.
Works.
Defect of the drain
motor.
Defect of PV
Bellows.
Defect of the
controller(Triac
defect)
Change the drain motor.
Remove the objects in
the PV asm.
Change the PV bellows.
Change the PV bellows.
(The bellows may swell
up if it contact petroleum
or petrochemical
substance because it is
made of rubber)
Change the controller.
9) Drain error happens while water drains normally.
Where, what & how to check?
Result of Check Possible Cause How to repair & settle
Ball Pressure Sensor
1. Check generation frequency of the
Ball Pressure Sensor without water.
Less than
26.3 kHz
26.3~27.1 kHz
Defect of the
Ball Pressure
Sensor.
Defect of the
controller.
Change the Ball
Pressure Sensor
Change the controller.
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