LG T7018AECA Service Manual ▷ View online
4) No water supply
Check
Check results
Possible reasons
Solution measures
Inlet valve
1． Water is not flowing
into inner tub and
there is current flow
though inlet valve is
working.
there is current flow
though inlet valve is
working.
1) Check if water tap is
close.
Close
Close
Explanation
2) check if the tap is
open
No
Use error
Open water tab
3)remove inlet valve and check
filter if problems are not
mentioned above.
mentioned above.
Filter is clogged
No cleaning
Use a brush to clean the
filter and filter should be
cleaned regularly.
cleaned regularly.
3) check whether
membrane hole is
clogged with foreign
objects or piston
inside valve is locked
if problems are not
mentioned above.
clogged with foreign
objects or piston
inside valve is locked
if problems are not
mentioned above.
Inlet valve fault
Replace inlet valve
2． If inlet valve is not
working and there is
no current sound
during water supply.
no current sound
during water supply.
1) Check if connectors
are not connected or
connected unproperly.
connected unproperly.
Poor connection
Connection fault
Connect
again
or
implement
troubleshooting caused by
poor connection.
troubleshooting caused by
poor connection.
2) Check inlet valve
resistance
Not between 0 。
8—1。2KΩ
8—1。2KΩ
Coil is cut off
Replace inlet valve
Pressure sensor
1 ． If error message “PE” is
1 ． If error message “PE” is
displayed: sensor fault.
“PE”error display
Connectors
do
not
connect or harness, coil is
cut off.
cut off.
Connect connectors or
replace harness. If coil is
cut off, replace the sensor.
replace harness. If coil is
cut off, replace the sensor.
2．Check BP sensor (pressure
sensor) frequency with no
load and no water supply.
load and no water supply.
Less than 20KHz
B、P sensor fault
Replace B、P sensor fault
Yes
Replace PC board
PC board
1．If inlet valve and sensor have
1．If inlet valve and sensor have
no fault, check the PC
board.
board.
31
5)
Continuous or intermittent water supply
Check
Check results
Possible reasons
Solution measures
Incorrect installation/water
leakage
1 ． Check if drain hose is
placed on the floor.(Pump
model)
Yes
Incorrect
installation
Drain hose should be
hang over standpipe or
wash tub. Replace parts.
2．Check leakage place
Water leakage from
some parts
Parts fault
Repair the parts
Pressure sensor
1 ． Check if wave wheel
rotates with no water supply.
No
No water pressure sensor
Check if pressure sensor
pipe is broken and repair
it.
2 ． Check if air hole is
clogged there is no sensor
fault.
Yes
Air hole is clogged
Repair air hole
Inlet valve
1． Is there water supply
under no power(power
is off)?
Yes
Inlet valve fault
Replace inlet valve
PC board
1．Press “POWER” and there
is water supply
immediately before
“START/PAUSE”
pressed.
Short-circuit
of
controlled
silicon
Replace PC board
32
6) Display “LE” and out of work
Check
Check results
Possible reasons
Solution measures
1．Check connectors
Poor connection
Connection fault
Connect
again
or
implement
troubleshooting caused by
poor connection.
2．Check rotor magnet
Cracked
Replace rotor
3．Measure if resistance
between two legs of stator
connector is between
5—15Ω.
Yes
No
None
Stator fault
Replace stator
Normal
Abnormal
None
Hall element fault
4．Check Hall element
Replace Hall element
5．It must be PC board
fault if fault is not
mentioned above.
Replace PC board
7) Power failure
Check
Check results
Possible reasons
Solution measures
Main voltage
Input voltage is abnormal
caused by interference.
Input voltage fault
Explanation
( high-frequency device
around washer)
Automatic power relay or
PC board
1． Check if power is
off automatically when
unplugging power cord
during power is on.
2． There must be PC
board fault if power is off
immediately when power
is on and power switch is
under good condition.
Power is cut off
immediately.
Power switch fault
Replace PC board
33
8) Undrained
Check
Check results
Possible reasons
Solution measures
Drain motor
Yes
Clogged with foreign
objects
1 ． Check if there is
working sound of drain
motor.
Unplug drain valve and
remove foreign objects
2．Measure resistance if
there is no working
sound
∞
Drain motor coil is cut off
Replace drain motor
Connector fault
Connector fault
Repair connector
3 ． Check connectors if
there is no working sound
and resistance is normal.
No Connector fault
PC board fault
Replace PC board
Drain hose
Winded
Installation problem
Install it again to avoid
winding
1．Check if the space is
too small to place
drain hose or hose is
winded
2．Check if drain hose is
folded or clogged
with foreign objects.
Clogged
Drain hose is clogged
Remove foreign objects or
install it again to avoid
winding.
9) Drain out of drainage time
Check
Check results
Possible reasons
Solution measures
Clogged with foreign
objects
Remove foreign objects
Drain valve shell
1．Check whether rubber
bellows are deformed
or there are foreign
objects in drain valve
components if keeping
draining.
Deformation of rubber
bellows
Deformation of rubber
bellows
Replace rubber bellows
PC board
1．Check if drain motor or
drain pump runs
immediately when
power is on.
Yes
PC board fault
Replace PC board
Drain hose
1．Check if drain hose is
properly installed. The
discharge height should
be approximately
0.9-1.2m from the floor.
less than suggested height
Incorrect installation
Place the outlet of drain
hose 0.9-1.2m from the
floor.
34
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