LG WM3431H Series User manual

WASHING MACHINE
SERVICE MANUAL
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
MODEL: WM3431H*/WM3434H*
WD-14312RD/WD-14316RD
CAUTION
Website: http://www.LGEservice.com [For U.S.A]
www.lg.ca [For CANADA]
E-mail: http://www.LGEservice.com/techsup.html
!

JAN. 2005 PRINTED IN KOREA P/No.: 828ER 0 5Q

CONTENTS
1. SPECIFICATIONS .........................................................................................................................
2. FEATURES & TECHNICAL EXPLANATION ................................................................................ 4
. PARTS IDENTIFICATION ............................................................................................................ 6
4. INSTALLATION & TEST ............................................................................................................... 7
5. OPERATION ................................................................................................................................10
6. WIRING DIAGRAM/PROGRAM CHART.....................................................................................12
7. TROUBLESHOOTING.................................................................................................................1
7-1. BEFORE PERFORMING SERVICE ...................................................................................1
7-2. QC TEST MODE.................................................................................................................1
7- . HOW TO CHECK THE WATER LEVEL FREQUENCY ......................................................1
7-4. ERROR DISPLAY ...............................................................................................................14
8. ERROR DIAGNOSIS AND CHECKLIST .....................................................................................16
8-1. DIAGNOSIS AND SOLUTION FOR ABNORMAL OPERATION ........................................16
8-2. FAULT DIAGNOSIS AND TROUBLE SHOOTING .............................................................19
9. DISASSEMBLY INSTRUCTIONS ...............................................................................................29
10. EXPLODED VIEW ..................................................................................................................... 8
10-1. CABINET & CABINET COVER ASSEMBLY..................................................................... 8
10-2. CONTROL PANEL & DISPENSER ASSEMBLY............................................................... 9
10- . DRUM & TUB ASSEMBLY................................................................................................40
10-4. DRYER .............................................................................................................................41
2

3
1. SPECIFICATION
WM3431H , WD-14312RD, WD-14316RD* WM3434H*
WASHING
SPIN
FAN MOTOR
DRAIN MOTOR
WASH HEATER
DRY HEATER
WASH
SPIN 0-1400 rpm 0-1200 rpm
ELECTRIC
POWER
CONS MPTION
ITEM
POWER S PPLY
PROD CT WEIGHT
REVOL TION
SPEED
OPERATIONAL WATER PRESS RE
CONTROL TYPE
WASH CAPACITY
DRY CAPACITY
DIMENSIONS
CYCLES
WASH/RINSE TEMPERAT RES
SPIN SPEEDS
OPTIONS
DELAY WASH
DOOR S W ITCH TYP E
WATER LEVEL
LA NDRY LOAD SENSING
ERROR DIAGNOSIS
POWER A TO OFF
CHILD LOCK
A TO RESTART
AC 120 V, 60 Hz
147 lbs. (68 kg)
140 W
410 W
25 W
80 W
1000 W
1200 W
50 rpm
4.5-145 psi (30-1000 kPa)
Electronic
2.11 cu. ft
8
1316 lbs. (4 kg )
23 " (W) X 25 " " (D) X 33 (H)
9
5
5
Soak, Extra Wash, Rinse+Spin, Spin Only, Dry Only, Delay Wash, Extra Rinse
up to 19 hours
Bi-Metal
Incorporated
Incorporated
10 steps (by sensor)
Incorporated
Incorporated
Incorporated
38 14 38

2. FEATURES & TECHNICAL EXPLANATION
4
2-1.FEATURES
 Automatic Process From Washing To Drying
Automatic process from washing to drying can be
selected easily.
 More economical by using Intelligent Wash
System
Intelligent Wash System detects the amount of load and
water temperature, and then determines the optimum
water level and washing time to minimize energy and
water consumption.
 Direct Drive System
The advanced Brushless DC motor directly drives the
drum without belt and pulley.
 Child-Lock
The Child-Lock prevents children from pressing any
button to change the settings during operation.
 Built-in Heater
Internal heater automatically heats the water to the
optimal temperature on selected cycles.
 Low noise speed control system
By sensing the amount of load and balance, it evenly
distributes load to minimize the spinning noise level.
 Auto Restart
If the washing machine is turned off by a power failure, it
will restart automatically from the position it stopped.

5
2-2. NEURO FUZZY WASHING TIME OPTIMIZATION
To get the best washing performance, optimal time is determined by the water temperature,
the selected washing temperature, and the size of the load.
2- . WATER LEVEL CONTROL
This model incorporates a pressure sensor which can sense the water level in the tub.
The water supply is stopped when the water level reaches the preset level, the washing
program then proceeds.
Spinning does not proceed until the water in the tub drains to a certain level.
NEURO-
FUZZY
load
size
selected
washing
temperature
water
temperature
washing time
rinsing time
spin rhythm, time
the best
washing
performance
SENSING PROCESSING DETERMINATION EFFECT

. PARTS IDENTIFICATION
6
ACCESSORIES
울
란제리
란제리

4. INSTALLATION & TEST
7
Before servicing, ask the customer what the trouble is.
Check the setup (power supply is 120 V AC, remove the transit bolts....).
Check with the troubleshooting guide.
Plan your service method by referring to the disassembly instructions.
Service the unit.
After servicing, operate the appliance to see whether it functions correctly.
STANDARD INSTALLATION
The appliance should be installed as follows:
REMOVE THE SHIPPING INSTALL THE APPLIANCE ADJUST THE
BOLTS
ON A FLAT AND FIRM SURFACE LEVELING
Remove the 4 shipping bolts Turn the leveling feet to adjust
with the supplied wrench. the appliance.
Do lower bolts first remove
easily.
Keep the shipping bolts and
wrench for future use.
Insert the 4 caps
(provided) into the hole.
Turn clockwise to raise;
counterclockwise to lower.

8
HOW TO CONNECT THE INLET HOSE
Verify that the rubber washer is inside of the
valve connector.
Tighten the inlet hose securely to prevent leaks.
CONNECT THE DRAIN HOSE
CONNECT POWER PLUG
The end of the drain hose should be placed less than 96 ” from the floor.
Connect the power plug to the wall outlet. Washer should be connected to dedicated
circuit.
Make sure that the hose is not twisted. Avoid submerging the end of the hose.

9
MAXMAX
max
Connect the power plug to
the outlet.
Connect the inlet hose.
Preparation Press the POWER button. Press the Start/Pause
for washing. button.
Press the Wash/Rinse button Check if the drum rotates Check if water is supplied
and the present temperature will
clockwise and counterclockwise. through the detergent dispenser.
be displayed.
Power off.
Check if the door can be
opened after minutes.
• Power off and power on.
• Press the Spin Speed button.
• Press the Start/Pause button.
• Check the spin and drain
functions.
If SVC is needed, remove the
remaining water by pulling out
the hose and removing the
cap.
Check the water heating Check automatic reverse Check the water supply.
function. rotation.
Check drain and spin Power off and open the Water removal
functions. door
TEST OPERATION

10
5. OPERATION
• Use this button to turn the power
On/Off.
• Rotate the Cycle selector
knob to select the cycle
designed for different
types of fabric and soil
levels.
• Use this option to pre
Press and hold Dela
lock/unlock control.
• When Child lock is s
are disabled except t
the washer while it is
•Soak: Use this option to wash normal clothes or thick and heavy
clothes which are excessively dirty.
• Extra Wash: If the laundry is heavily soiled, this option is effective.
• Rinse+Spin: Use this option to rinse and then spin.
• Spin Only: Use this option to select spin cycle only.
• Dry Only: When you want Dry only, select this option.
• Use this button to Start/
Stop the washer.
• This display shows:
a) the estimated time remaining in the
cycle when operating.
b) an error code when an error has been
detected.

11
•Extra Rinse
•DRY Button•Wash/Rinse, Spin Speed,
Soil Level Button
•Delay Wash
o prevent unwanted use of the washer.
elay Wash button for seconds to
ol.
s set, Child Lock lights and all buttons
ept the Power button. You can lock
it is operating.
• This option provides an
additional rinse cycle.
• Use this option to ensure
the removal of detergent
or bleach residue from
garments.
• Allows the start of any cycle to
be delayed for 1~19 hours.
• Select a water temperature based on the type of
load you are washing.
• To change the spin speed, press the Spin Speed
button repeatedly to cycle through available
options.
• To change the soil level, press the Soil Level
button repeatedly until the desired setting is on.
• These lights show which portion
of the cycle the washer is
operating.
• Dry programs selected by pressing the Dry button.
• By pressing the button [Normal – More – Time –
Off – Low Temp. – Less] can be selected.

12
6. WIRING DIAGRAM/PROGRAM CHART
MAIN PWB
NA
VT BL BL WH GY YL YL YL
BL
YL
BL RD
RD
RD
FUSE
FUSE
DOOR LOCK S/W
DRAIN PUMP
YL
BK
BK BK BK BK BK
UVW
BL BN
BK
WH
GN/YL
GN
/
YL
GN
RD
BK
BKRD
CP
WASH
HEATER
POWER
CORD
DRY
HEATER
INLET
VALVE
Ha Hb
Voo GND
MOTOR
FAN MOTOR
PRESSURE
SENSOR
n
"n" PIN CONNECTOR
#250 TERMINAL+HOUSING
RING TERMINAL GROUND
Base/Line
854ER 001S
WH
TH1
(TUB)
(S) (S)
(G)
TH2
(DRY DUCT)
TH
(CONDENSING DUCT)
BNBKGY PIWH SB WH BK YL OR BL BL RD YL BL RD GY WH BN GY PI
12 456
12 456
12 456
12
12
12
21
21
24 1
124
12
12
12
124
14
1
2
2 4
14
1
2
24
1
1
42
4256
654 2
12 45
12 45
1
654
12
12
12
12
12
12
12
12
12
12 21
DISPLAY
PWB
WH GYRD RD YL BL RD WH
NA
WHWH
WH
WH
WH
WHWHNA
WH
WH
RD
NOISE
FILTER
12
12
12
12
D
R
Y
H
O
T
M
A
I
N
B
L
E
A
C
H
**
Cool-down **Approx.
(Minutes)
* Wash time is in minutes.
** The total working time will vary with the load size,
water temperature and ambient temperature.
Soak

13
7. TROUBLE SHOOTING
7-1. BEFORE PERFORMING SERVICE
Be careful of electric shock when disconnecting parts while troubleshooting.
The voltage of each terminal is 110/120 V AC and DC when the unit is plugged in.
7-2. QC TEST MODE.
The washer must be empty and the controls must be in the off state.
1. Press the Wash/Rinse and Spin Speed buttons simultaneously.
2. Press the Power button, while the above condition. Then buzzer will sound twice.
. Press the Start/Pause button repeatedly to cycle through the test modes.
7- . HOW TO CHECK THE WATER LEVEL FREQUENCY
Press the Wash/Rinse and Spin Speed button simultaneously.
So, for example a display indicating 241: a Water level frequency of 241 x.1 kHz
= 24.1 kHz
The digits indicate the water level frequency ( x.1 kHz ).
Check Point Display Status
None Turns on all lamps and locks the door.
1 time Tumble clockwise. rpm (40~50)
2 times Low speed Spin. rpm
times High speed Spin. rpm
4 times Inlet valve for bleach turns on. Water level frequency (25~65)
5 times Inlet valve for main wash turns on. Water level frequency (25~65)
6 times Inlet valve for hot water turns on. Water level frequency (25~65)
7 times Inlet valve for dry turns on. Water level frequency (25~65)
8 times Tumble counterclockwise. rpm (40~50)
9 times
Heater turns on for sec. Water temperature
10 times Drain pump turns on. Water level frequency (25~65)
11 times
Dry operation for 6 minutes. Temperature in Dry duct.
12 times
Power off and unlock the door. Turn off all lamps.
Number of times the
Start/Pause button is pressed

14
7-4. ERROR DISPLAY
If you press the Start/Pause button when an error is displayed, any error except will disappear
and the machine will go into the pause status.
In case of if the error is not resolved within 20 sec., or in the case of other errors,
if the error is not resolved within 4 min., power will be turned off automatically and the error code will
blink. In the case of , power will not be turned off.
ERROR SYMPTOM CAUSE
WATER INLET
ERROR
• Correct water level (246) is not reached within 8 minutes
after water is supplied or it does not reach the preset water
level within 25 minutes.
• The load is too small.
• The appliance is tilted.
• Laundry is gathered to one side.
• Non distributable items are put into the drum.
1
2
IMBALANCE
ERROR
• Not fully drained within 10 minutes.
3
DRAIN
ERROR
• Water is overflowing (water level frequency is over 21 ).
※If is displayed, the drain pump will operate to
drain the water automatically.
4
OVER FLOW
ERROR
• The SENSOR SWITCH ASSEMBLY is out of order.
5
PRESSURE
SENSOR
ERROR
• Door not all the way closed.
• Loose electrical connections at Door switch and
PWB Assembly.
• The DOOR SWITCH ASSEMBLY is out of order.
6
DOOR OPEN
ERROR
• The THERMISTOR is out order.
7
HEATING
ERROR

ERROR SYMPTOM CAUSE
8
9
10
• MAIN PWB ASSEMBLY is out of order
Replace the MAIN PWB ASSEMBLY
• Winding in the STATOR ASSEMBLY is short-circuited.
Replace the STATOR ASSEMBLY
• “ ” is dispplayed during a high spin
Replace the LEAD WIRE ASSEMBLY (MOTOR)
• The connector in the LEAD WIRE ASSEMBLY is not connected to
the connnector of STATOR ASSEMBLY
Reconnect or repair the connector
• The hall sensor is out of order/defective.
Replace the STATOR ASSEMBLY
• The Dry Heater is out of order
Replace the Dry Heater
• The Connector of the Dry Heater is not connected properly to the
connector in the Main PWB ASSEMBLY
Reconnect or repair the connector
• The Dry fan motor is out of order
Replace the fan Motor.
CURRENT
ERROR
MOTOR
ERROR
DRY
HEATOR
ERROR
15

16
8-1. DIAGNOSIS AND SOLUTION FOR ABNORMAL OPERATION
8. ERROR DIAGNOSIS AND CHECKLIST
SYMPTOM GUIDE FOR SERVICE CALL
NO POWER
Water inlet trouble
YES
YES
YES
NO
NO
YES
NO
NO
Is the power plug connected firmly to
120V~ outlet?
Power failure? or Breaker opened?
Visit to check
Is " " displayed?
Is the tap opened?
Is the tap frozen?
Is the water supply shut-off?
Is filter in the inlet valve clogged with
foreign material?
Visit to check
Clean the filter of
inlet valve

17
SYMPTOM
• Door does not open
• Error displayed on
the program
• DRAIN TROUBLE
GUIDE FOR SERVICE CALL
NO
YES
NO
YES
Started with door opened?
NO
YES
Is the drain pump filter clogged with foreign
material such as pin, coin and etc.?
Is the drain hose frozen with water,
kinked or crushed?
Visit to check
Close the door
Visit to check
Check if the door switch is O K.
Is " " displayed?
Clean up
the filter.
.

18
SYMPTOM GUIDE FOR SERVICE CALL
Suds overflow from the
appliance.
(In this condition, wash and
spin do not operate
normally)
YES
YES
YES
YES
YES
MAX
max
M
A
X
Detergent
for wash Fabric softener Liquid Bleach
Is low-sudsing detergent for the drum
washing machine used?
Is the proper amount of detergent used
as recommended?
Reduce the amount of detergent.
Is softener put in the correct compartment of
the drawer?
Is the drawer closed during wash?
Is the cap clogged?
Explain proper use of liquid laundry products.
< Clean the compartment for softener >
Visit to check
LOW-SUDSING
This appliance has the automatic suds sensing function which
operates during high-sudsing for good rinse and preventing
overflow.
When high suds are sensed, suds removing function such as
drain, water input and pause will operate without rotating the
drum.
• Liquid laundry products
do not flow in.

19
8-2. FAULT DIAGNOSIS AND TROUBLESHOOTING
1. Be careful of electric shock or disconnecting the parts while trouble shooting.
2. First of all, check the connection of each part terminal with wiring diagram.
. If you replace the MAIN PWB ASSEMBLY, put in the connectors correctly.
NO
NO
YES
YES
YES
NO
NO
YES
<PWB ASSEMBLY (MAIN)>
<PWB ASSEMBLY (MAIN)>
Check the fuse or reset
the circuit breaker.
Replace MAIN PWB
ASSEMBLY
Reconnect.
Reconnect.
Is the supplied voltage 120 V AC?
Is the led(1) on?
Are the connectors (2) on the PWB loose?
Is wire of the PWB ASSEMBLY disconnected?
Replace PWB ASSEMBLY
NO POWER
CAUTION
!