LG WM3431H, WM3434H Service manual

W ASHING MACHINE

SERVICE MANUAL

READ THIS MANUAL CAREFULLY TO DIAGNOSE PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.

MODEL: WM3431H*/WM3434H*

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.:3828ER3035Q

CONTENTS

1. SPECIFICATIONS.........................................................................................................................3

2. FEATURES & TECHNICAL EXPLANATION ................................................................................ 4

3. PARTS IDENTIFICATION ............................................................................................................ 6

4. INSTALLATION & TEST ............................................................................................................... 7

5. OPERATION................................................................................................................................10

6. WIRING DIAGRAM/PROGRAM CHART.....................................................................................12

7. TROUBLESHOOTING.................................................................................................................13

7-1. BEFORE PERFORMING SERVICE...................................................................................13

7-2. QC TEST MODE.................................................................................................................13

7-3. HOW TO CHECK THE WATER LEVEL FREQUENCY......................................................13

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.....................................................................................................................38

10-1. CABINET & CABINET COVER ASSEMBLY.....................................................................38

10-2. CONTROL PANEL & DISPENSER ASSEMBLY...............................................................39

10-3. DRUM & TUB ASSEMBLY................................................................................................40

10-4. DRYER.............................................................................................................................41

1. SPECIFICATION

WM3431H* WM3434H*

WASHING

SPIN

FAN MOTOR

DRAIN MOTOR

WASH HEATER

DRY HEATER

WASH

SPIN 0-1400 rpm 0-1200 rpm

ELECTRIC

POWER

CONSUMPTION

ITEM

POWER SUPPLY

PRODUCT WEIGHT

REVOLUTION

SPEED

OPERATIONAL WATER PRESSURE

CONTROL TYPE

WASH CAPACITY

DRY CAPACITY

DIMENSIONS

CYCLES

WASH/RINSE TEMPERATURES

SPIN SPEEDS

OPTIONS

DELAY WASH

DO OR SWITCH TY P E

WATER LEVEL

LAUNDRY LOAD SENSING

ERROR DIAGNOSIS

POWER AUTO OFF

CHILD LOCK

AUTO RESTART

AC 120 V, 60 Hz

147 lbs. (68 k g)

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

lbs. (4 kg )

23 " (W) X 25 " " (D) X 33 (H)

Soak, Extra W ash, Rinse+Spin, Spin Only, Dry Only, Delay Wash, Extra Rinse

up to 19 hours

Bi-Metal

Incorporated

10 steps (by sensor)

Incorporated

2. FEATURES & TECHNICAL EXPLANATION

2-1.FEATURES

n Automatic Process From Washing To Drying

Automatic process from washing to drying can be selected easily.

n 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.

n Direct Drive System

The advanced Brushless DC motor directly drives the drum without belt and pulley.

n Child-Lock

The Child-Lock prevents children from pressing any button to change the settings during operation.

n Built-in Heater

Internal heater automatically heats the water to the optimal temperature on selected cycles.

n Low noise speed control system

By sensing the amount of load and balance, it evenly distributes load to minimize the spinning noise level.

n Auto Restart

If the washing machine is turned off by a power failure, it will restart automatically from the position it stopped.

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.

2-3. 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

DETERMINA TION

EFFECT

3. PARTS IDENTIFICATION

ACCESSORIES

울

란

제

리

란제리

4. INSTALLATION & TEST

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 INST ALL THE APPLIANCE ADJUST THE

BOL TS

ON A FLA T 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.

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.

MAX

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 3 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 OPERA TION

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 W ash: 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.

• Extra Rinse

• DRY Button• Wash/Rinse, Spin Speed,

Soil Level Button

• Delay Wash

elay Wash button for 3 seconds to

s set, Child Lock lights and all buttons 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.

6. WIRING DIAGRAM/PROGRAM CHAR T

MAIN PWB

VT BL BL WH GY YL YL YL

BL RD

FUSE

DOOR LOCK S/W

DRAIN PUMP

BK BK BK BK

UVW

BL BN

GN/YL

BKRD

WASH HEATER

POWER

CORD

DRY HEATER

INLET VALVE

Voo

GND

MOTOR

FAN MOTOR

PRESSURE

SENSOR

"n" PIN CONNECTOR #250 TERMINAL+HOUSING RING TERMINAL GROUND

Base/Line

3854ER3001S

TH1 (TUB)

(S) (S)

(G)

TH2 (DRY DUCT)

TH3 (CONDENSING DUCT)

BNBKGY PIWH SB WH BK YL OR BL BL RD YL BL RDGYWH

BN GY PI

123456 123456

123456 123

123 123

321 321

32431

124

123 123

123 1234

14 12323 4

14123

234

13142

42356

65432

12345 12345

654

123

123 123

1231212

123

123 123

123 321

DISPLAY PWB

WH GYRD RD YL BL RD WH

WHWH

WHWHNA

NOISE FILTER

123 123

D R Y

H O T

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

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.

3. Press the Start/Pause button repeatedly to cycle through the test modes.

7-3. 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 3 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 3 sec. Water temperature

10 times

Drain pump turns on.

Water level frequency (25~65)

1 1 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

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