LG WD-16401FD Service Manual ▷ View online
20
Wiring diagram
Option (Hot)
Option (Hot)
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
NO WATER SUPPLY
DETERGENT DOES NOT FLOW IN
Is water supply shut-off?
Is the tap opened?
Is the inlet valve filter clogged with impurity?
Is resistance between each terminal of INLET VALVE
ASSEMBLY is 2~8 k
Ω?
Check the voltage of the inlet valve connector
220 -240V~.
(Refer to 7-2 QC TEST MODE)
When you press both Rinse button and Spin button
simultaneously, is the water level frequency below
240?
simultaneously, is the water level frequency below
240?
Open the tap.
check the AIR CHAMBER
and the tube clogged with
impurity.
Clean the filter
Replace the INLET VALVE
ASSEMBLY.
Replace the MAIN PWB
ASSMEBLY.
Is water supplied?
Refer
NO WATER SUPPLY
Are replaceptacles correctly connected to the
terminals of the INLET VALVE ASSEMBLY?
Is detergent put in the correct compartment of the
drawer?
Is the detergent caked or hardened?
Check the wiring on the
dispenser.
Put the detergent in the
correct position
correct position
:Detergent
Clean the drawer
PRE+MAIN
MAIN WASH
21
Option (Hot)
Wiring diagram
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
SOFTENER DOES NOT FLOW IN
ABNORMAL SOUND
Is water supplied?
Refer to
NO WATER SUPPLY
Are receptacles correctly connected to the terminals
of the INLET VALVE ASSEMBLY?
Check the wiring on the
dispenser.
Is softener put in the correct compartment of the
drawer?
Put it in the correct
compartment.
Is the softener cap clogged?
Clean the cap and drawer.
Is the motor bolt loosened?
Fix the bolt tightly.
Is there friction noise from the motor?
Replace the STATOR
ASSEMBLY or ROTOR
ASSEMBLY
22
220-240V
NO
NO
NO
NO
NO
NO
NO
MAIN PWB ASSEMBLY
MAIN PWB ASSEMBLY
YES
YES
YES
YES
YES
(1)
(2)
HEATING WITHOUT WATER
DRAIN MALFUNCTIONING
When pressing Spin and OPTION at the same
time after draining, is the water level frequency 252
or more? When pressing Rinse Time Delay
buttons at the same time while wash, is the water
level frequency between 230~234?
Replace the
S.PRESSURE SWITCH
ASSEMBLY
Checking voltage between two pins as press the
POWER button is the voltage 220 -240V~?
Replace the MAIN PWB
ASSEMBLY
Is the drain hose twisted or frozen?
Repair the DRAIN HOSE
ASSEMBLY.
Is the impeller of the drain pump clogged?
Remove foreign material.
Is the connector disconnected,disassembled?
Reconnect or repair the
connector
Is the coil of the drain pump cut-off?
(resistance of coil is 90~160
Ω)
Repair the DRAIN PUMP
ASSEMBLY.
When checking voltage between connectors
( , )on spinning, is the voltage 220 -240V~ as
the figure?
the figure?
Repair the MAIN PWB
ASSEMBLY.
MAIN PWB ASSEMBLY
MAIN PWB ASSEMBLY
NO
NO
NO
NO
YES
YES
YES
220-240V~
1
4
5
2
3
6
(1)
Yellow
Red
23
WASH HEATER TROUBLE
HEATING CONTINUOUSLY ABOVE
THE SETTING WATER TEMPERATURE
When checking the voltage between connectors
(
, ) during whites washing, Is the voltage
220 - 240V~?
Replace the MAIN PWB
ASSEMBLY
After power off, is the resistance of wire
(RED-YELLOW) connectors between 10 ~30
Ω ?
Normal
After power off and the heater terminal is
disconnected, is the resistance 10~30
Ω?
Replace the HEATER
ASSMEBLY
When checking THERMISTOR on the tub is the
THERMISTOR loosened above 2mm from the
rubber?
Push the THERMISTOR
tightly to the rubber.
When disconnect the connector (1)on the, MAIN
PWB ASSEMBLY is the resistance of the natural
connectors [
(Blue/White),
(Brown)] between
2.5k
Ω to 180kΩ (105 ~0 )?
Replace the THERMISTOR
(6322FR2046B)
Click on the first or last page to see other WD-16401FD service manuals if exist.