LG WM3885HCA, WM3875HCA Service Manual

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WASHING MACHINE

SERVICE MANUAL

CAUTION

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

MODEL: WM3885H*CA / WM3875H*CA

OCT. 2009 PRINTED IN KOREA P/No.: MFL30599154

CONTENTS

1. Specifications .................................................................................................................................. 5

2. Features and Technical Explanation ............................................................................................ 6-8

3. Parts Identification ........................................................................................................................... 9

4. Installation and Test ................................................................................................................. 10-12

5. Operation ................................................................................................................................. 13-19

5-1. Control Panel Features ..................................................................................................... 13-15

5-2. Cycle Guide ........................................................................................................................... 16

5-3. Special Functions ................................................................................................................... 17

5-4. Explanation of Each Process ............................................................................................ 18-19

6. Wiring Diagram / Program Chart .............................................................................................. 20-21

7. Test Mode ...................................................................................................................................... 22

7-1. Safety Caution ....................................................................................................................... 22

7-2. Load Test Mode ..................................................................................................................... 22

7-3. How To Read the Display in Load Test Mode ........................................................................ 23

7-4. How To Check the Water Level Frequency and Vibration Sensor Error ................................ 23

8. Troubleshooting ....................................................................................................................... 24-39

8-1. Safety Caution ....................................................................................................................... 24

8-2. Error Mode Summary ....................................................................................................... 24-25

8-3. Troubleshooting Summary ..................................................................................................... 26

8-4. Troubleshooting With Error ............................................................................................... 27-33

8-5. Troubleshooting Else ........................................................................................................ 34-39

9. Component Testing Information ............................................................................................... 40-54

9-1. Filter Assembly (Line Filter) ................................................................................................... 40

9-2. Door Look Switch Assembly ............................................................................................. 41-42

9-3. Stator Assembly ................................................................................................................ 43-45

9-4. Pump Motor Assembly ........................................................................................................... 46

9-5. Inlet Valve Assembly .............................................................................................................. 47

9-6. Heater Assembly .................................................................................................................... 48

9-7. Thermistor Assembly ........................................................................................................ 49-50

9-8. Steam Generator Assembly .............................................................................................. 51-52

9-9. Lamp ...................................................................................................................................... 53

9-10. Vibration sensor assembly ................................................................................................... 54

10. Disassembly Instructions ......................................................................................................... 55-65

11. Exploded View ......................................................................................................................... 66-68

11-1. Cabinet and Control Panel Assembly ................................................................................... 66

11-2. Drum and Tub Assembly ...................................................................................................... 67

11-3. Dispenser Assembly ............................................................................................................. 68

1. SPECIFICATIONS

ITEM WM3885H*CA / WM3875H*CA

COLOR

POWER SUPPLY

PRODUCT WEIGHT

ELECTRIC POWER

CONSUMPTION

REVOLUTION

SPEED

CYCLES

WASH/RINSE TEMPERATURES

SPIN SPEEDS

OPTIONS

WATER CIRCULATION

OPERATIONAL WATER PRESSURE

CONTROL TYPE

WASH CAPACITY [cu.ft. ]

DIMENSIONS DELAY WASH

DOOR SWITCH TYPE

WATER LEVEL

LAUNDRY LOAD SENSING

WASHING

DRAIN MOTOR

WASH HEATER

WASH

SPIN

W : White, C : Chardonnay Steel

AC 120 V, 60 Hz

220.5 lbs (100 kg) 280 W

80 W

1000 W

46 rpm

0-1,400 rpm

5 5

STEAM, DELAY WASH, STAIN CARE, CUSTOM PGM, COLD

WASH

LOCK, DRUM LIGHT, FRESH CARE, LANGUAGE, PRE-WASH,

27”(W) X 293/4”(D) X 3811/16”(H), 5013/16” (D, door open)

WASH/RINSE OPTIMIZERTM, EXTRA RINSE, CHILD

WATER PLUS, ENERGY USAGE DISPLAY

Incorporated

14.5-116 psi (100-800 kPa) Electronic

4.13 (4.8 IEC)

up to 19 hours

PTC + Solenoid

10 steps (by sensor)

Incorporated

ERROR DIAGNOSIS

AUTO POWER OFF

CHILD LOCK

STEAM

Incorporated Incorporated Incorporated

Incorporated

2. FEATURES & TECHNICAL EXPLANATION

2-1. FEATURES

Ultra Capacity

The larger drum enables not just higher head drop and stronger centrifugal force, but also less tangling and wrinkling of the laundry. Heavier loads, such as king size comforters, blankets, and curtains, can be washed.

Direct Drive System

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

Tilted Drum and Extra Large Door Opening

Tilted drum and extra large opening make it possible to load and unload clothing more easily.

Steam Washing and SteamFresh

Steam washing features upgraded washing performance with low energy and water consumption. SteamFresh

cycle removes wrinkles from dry clothes.

RollerJets

Washing ball enhances the wash performance and reduces damage to the clothing. The jets spray and help tumble clothes to enhance washing performance while maintaining fabric care.

Automatic Wash Load Detection

Automatically detects the load and optimizes the washing time.

Built-in Heater

Internal heater helps to maintain water temperature at its optimum level for selected cycles.

Child Lock

The child lock prevents children from pressing any button to change the settings during operation.

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.

water

temperature

washing time

selected washing

temperature

SENSING

load

size

PROCESSING

NEURO-

FUZZY

rinsing time

spin rhythm, time

DETERMINATION

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.

the best washing performance

EFFECT

2-4. DOOR CONTROL

The door can be opened by pulling the door handle whenever washer is not in operation. When the cycle is completed, the DOOR LOCKED light will turn off. If a power failure has occurred while in operation, the door will unlock after 5 minutes. Clicking sounds can be heard when the door is locked/unlocked.

2-5. THE DOOR CAN NOT BE OPENED

While program is operating. When a power failed and power plug is taken out in operation. While Door Lock lights turn on. White the motor is in the process of inertial rotating, through the operation is paused.

2-6. DOOR LOCKED LAMP LIGHTS

When the frequency of water level is lower than 22.9 kHz.

(It can be canceled when the frequency is more than 23.8 kHz.)

When the temperature inside the tub is higher than 45°C and water level is not 25.5 kHz.

(It can be canceled when the water level is 25.5 kHz or the temperature inside the tub is lower than 40°C.)

2-7. CHILD LOCK

Use this option to prevent unwanted use of the washer. Press and hold STAIN CARE button for 3 seconds to lock/unlock control. When child lock is set, CHILD LOCK lights and all buttons are disabled except the POWER button. You can lock the controls of the washer while washing. CHILD LOCK lasts after the end of cycle. If you want to deactivate this function, Press and hold the STAIN CARE button for 3 seconds.

2-8. WATER CIRCULATION

When washing and rinsing function of shower at the upper part of Gasket. When washing, it continuously operates for 3 minutes and intermittently. When rinsing, it continuously operates after completion of water supply.

2-9. STEAM

For tough stained clothes, sick room linens, or baby clothes. Steam Wash is available with Sanitary, Bulk/Large, Perm. Press, Cotton/Normal, and Baby Wear cycles. This option features upgraded washing performance with low energy and water consumption. Do not load delicates such as wool, silk, and easily discolored clothes.

2-10. DRUM LIGHT

The drum light comes on when the power button is pressed. It goes off when the door is closed and the washer starts operation. The drum light remains off when the door is locked. The drum light can be turned on while the washer is in operation by pressing the DELAY WASH button for 3 seconds. The light will turn off automatically 4 minutes later. The drum light comes on when the washing cycle is finished and goes off 4 minutes later.

3. PARTS IDENTIFICATION

Drain Hose

Dispenser

Door

Shipping Blots

Power Plug

• If the supply cord is damaged, it must be replaced by the manufacturer or its authorized service technician in order to avoid a hazard.

Control Panel Door Cleaning NozzleDoor Cleaning Nozzle

Water Circulation & Steam Nozzle

Drum Light

Drum

Door Seal

Magnetic Door Plunger

Lower Cover Cap

Hoses (1 Hot and 1 Cold)

ACCESSORIES

Hot/Cold (1 each)

Hose

Back of Washer

Cold Water Inlet

Adjustable Feet

Hot Water Inlet

Drain Pump FilterDrain Plug

Air Vent for Safety

Tie strap (Option)

Wrench

to secure drain hose to standpipe,

inlet hose, or laundry tub

Non-skid pads

Caps(4)

(for covering shipping

bolt holes)

Elbow Bracket

(for securing drain hose)

4. INSTALLATION & TEST

Before servicing, ask the customer what the trouble is.

When installing or repairing the washer, put on long gloves and safety glasses.

Check the setup (power supply is 120 V 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 transit bolts, level the washer, etc.)

REMOVE THE SHIPPING

BOLTS

Remove the 4 shipping bolts with the supplied wrench.

આ Remove the lower boits fist.

It is easier that way.

Keep the shipping bolts and spanner for future use. Insert the 4 caps (provided) into the hole.

INSTALL THE APPLIANCE

ON A FLAT AND FIRM SURFACE

ADJUST THE

LEVELING

Turn the leveling feet to adjust the appliance.

Lower

Higher

Keeping

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. Install the inlet hose to correct temperature water tap. Otherwise, it cause drips on the drawer panel handle and drawer panel.

CONNECT THE DRAIN HOSE

Hot

Cold

• Make sure that the hose is not twisted.

• Avoid submerging the end of the hose.

આ The end of the drain hose should be placed less than 96” from the floor.

CONNECT POWER PLUG

• Connect the power plug to the wall outlet.

• Avoid connecting several electric devices, as doing so may cause a fire.

TEST OPERATION

Preparation for

washing.

• Connect the power plug to the outlet.

• Connect the inlet hoses.

Check the water heating

function.

Press the POWER button.

Check the automatic reverse

rotation.

Press the START/PAUSE

button.

• Listen for a click to determine if the door has locked.

Check the water supply.

• Press the WASH/RINSE button and the present temperature will be displayed.

Check the drain and spin

functions.

•Power off and the power on.

• Press the SPIN SPEED button.

• Press the START/PAUSE button.

• Check the spin and drain functions.

• Check if the drum rotates clockwise and counterclockwise.

Press the START/PAUSE

button.

• Listen for a click to determine if the door is unlocking.

• Check if water is supplied through the detergent dispenser.

Water removal

• If SERVICE is needed during check, remove the remaining water by pulling out the hose cap.

5. OPERATION

5-1. CONTROL PANEL FEATURES

WM3885H*CA WM3875H*CA

POWER ON/OFF BUTTON

Press to turn the washer ON. Press again to turn the washer OFF. NOTE: Pressing the ON/OFF button during a cycle will cancel that cycle and any load settings will be lost.

CYCLE SELECTOR KNOB

Turn this knob to select the desired cycle. Once the desired cycle has been selected, the standard presets will be shown in the display. These settings can be adjusted using the cycle setting buttons anytime before starting the cycle.

START/PAUSE BUTTON

Press this button to START the selected cycle. If the washer is running, use this button to PAUSE the cycle without losing the current settings. NOTE: If you do not press the START/PAUSE button within 4 minutes of selecting a cycle, the washer automatically turns off.

STEAM BUTTON

Press the STEAM button to add steam to the selected cycle for added cleaning power. NOTE: Steam can be added to only the following cycles: STEAM FRESH™, ALLERGIENE™, SANITARY, BRIGHT WHITES™, BULKY/LARGE, PERM. PRESS, COTTON/NORMAL, HEAVY DUTY and TOWELS.

DELAY WASH BUTTON

Press this button to delay the start of the wash cycle. Each press of the button increases the delay time by one hour, up to 19 hours.

D H

SPECIAL FUNCTION BUTTONS

The special function buttons allow you to select additional functions and will light when selected. Certain buttons also allow you to activate secondary functions by pressing and holding the button for 3 seconds. For detailed information about the individual functions, please see the following pages.

OPTION BUTTON

Press this button to select additional cycle options such as WATER PLUS, PRE WASH and ENERGY USAGE DISPLAY. Press the button next to the desired option in the display to select. The button will light to show the option has been selected.

LCD DISPLAY

The display shows the settings, estimated time remaining, options, and status messages for your Steam Washer™. The light in the display will remain on through the cycle.

CYCLE SETTING BUTTONS

Use these buttons to select the desired cycle options for the selected cycle. The current options are shown in the display. Press the button for that option to view and select other settings.

Power Button

Status Indicator

• Use this button to turn the power On/Off.

• It shows elapsed time of the cycle the washer is operating.

Cycle Selector Knob

• Rotate the Cycle selector knob to select the cycle designed for different types of fabric and soil levels.

Start/Pause

• Use this button to Start/Stop the washer.

Option Button

• STEAM: Use the STEAM button to add steam to the cycle for the extra cleaning.

• WASH/RINSE OPTIMIZERTM: Use the WASH/RINSE OPTIMIZERTMbutton to select the water level, and detergent mount automatically by the smart sensor and program.

• PRE-WASH:

• CUSTOM PGM:

• DELAY WASH:

• COLDWASHTM: Use this function to wash without hot water and heating.

• EXTRA RINSE : This option will add an extra rinse cycle to the selected cycle.

• STAIN CARE : Select this option for heavily stained clothes, such as play clothes or work clothes.

• DRUM LIGHT : The drum is equipped with a blue LED light that illuminates when the washer is turned on.

• CHILD LOCK : Use this option to prevent unwanted use of the washer or to keep cycle settings from being

Use the PREWASH button to select to wash temporary before to start the course which you chosen.

Use the CUSTOM PGM button to select the course that you has been saved by PGM SAVE.

Once you have selected the cycle and other settings, press this button to delay the start of the wash cycle.

changed while the washer is operating.

Wash/Rinse, Spin speed, Soil Level, Beeper Button

• 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.

• Press repeatedly to adjust the volume of the Beeper.

5-2. Cycle Guide

The cycle guide below shows the options and recommended fabric types for each cycle.

=Available option

NOTE: To protect your garments, not every wash/rinse temperature, spin speed, soil level, or option is available with every cycle.

1616

5-3. SPECIAL FUNCTIONS

The option buttons also activate special functions, including CHILD LOCK, DRUM LIGHT, FRESH CARE, and LANGUAGE. Press and hold the option button marked with the special function for 3 seconds to activate.

CHILD LOCK

Use this option to prevent unwanted use of the washer or to keep cycle settings from being changed while the washer is operating. Press and hold the STAIN CARE button for 3 seconds to activate or deactivate CHILD LOCK. CHILD LOCK will be shown in the display, and all controls are disabled except the ON/OFF button. The washer can be locked during a cycle. NOTE: CHILD LOCK lasts after the end of cycle. If you want to deactivate this function, Press and hold the STAIN CARE button for 3 seconds.

DRUM LIGHT

The drum is equipped with a blue LED light that illuminates when the washer is turned on. This light automatically turns off when the door is closed and the cycle starts. To turn on the light during a cycle, press and hold the DELAY WASH button for 3 seconds. The drum light will illuminate and then turn off automatically after 4 minutes.

LANGUAGE

This option allows you to change the language shown in the display. Once set, the selected language will stay set even after the power is turned off. The display language options are English, French, and Spanish; English is the default language.

To change the language:

Press the ON/OFF button to turn on the washer.

Press and hold the OPTION button for 3 seconds, until the following screen appears in the display.

When OPTION is pushed, English is displayed as the default language.

Press the COLDWASH FRANÇAIS (French).

button to select ESPAÑOL (Spanish) or FRESH CARE for

5-4. Explanation of each process

No. Process Explanation

Stay • Electrical power is supplied.

•Washer is ready to work and the micom is in the active mode.

Water

2. supply

Soaking

3. and washing laundry

Heating and washing

Washing and heating

/ washing

7. Washing • Fuzzy logic decides washing time according to the laundry load, water

• After loading laundry and selecting a course and a cycle, water is supplied and drum rotates.

• When a user selects Pre-wash course, water is supplied through pre wash valve.

•To get laundry wet, drum rotates clockwise and counterclockwise.

• If water amount is insufficient at this time, the Inlet valve will supply water again.

• The heater heats the water in drum to the selected water temperature and drum rotates for washing.

• When the water temperature reaches to the selected temperature, the heating stops and only the drum rotates.

• If water temperature becomes lower than selected because of re-supplied water, the heating starts again.

temperature, and other factors.

Drainage • A pump motor drains the water from the drum.

•After sensing drained water amount by water level frequency, spin starts.

• When a heating course is selected, stay cooling process is performed to decrease the water temperature gradually to prevent laundry from being damaged and for safety reasons.

9. Untangling (Sensing eccentricity)

• It balances laundry load and senses the eccentricity of the load, to only allow spinning without vibration.

• If the eccentricity is worse than the allowed level, it repeats the disentangling process. When the repeated time is more than allowed level, it displays UE.

• If the eccentricity is good, the intermittent spin starts.

• During this process, the drain pump works for drainage intermittently.

No. Process Explanation

B. Rinse

C. Remaining

D. Rinse water

F. Last

Intermittent spin

spin

supply

Rinse • Rinsing process.

drainage

•To reach the correct set speed, the motor rotates clockwise and counterclockwise directions after spin process starts.

• If the water level frequency is lower than 23.0 kHz, a washer senses suds and starts suds removal process.

• In this process, the remaining water during washing process is extracted and the selected speed is kept.

• Removing suds process is in active mode at this cycle.

• After spin finishes, the drum rotates by remaining spin power until it stops. Motor power is off.

• This process is overlapped with next process.

•Water supply for rinse process.

• After spin finishes and power is not supplied to motor, the drum rotates by remaining spin power.

• If rinse hold is selected, the drainage is not proceeded after rinse finishes.

Disentangling • The same as item 9.

Intermittent spin

Main spin1 • The same as item B.

J. Main spin2 • At the end of a main spin, the spin speed will reach the selected rpm.

K. Remaining spin • The same with item C.

L. Disentangling • After spin finishes, disentangling starts to remove unbalanced

M. End • After ‘end’ signal is displayed, it stays for 8 seconds and power is

• The same as item A.

laundry.

automatically turned off. (Auto type door switch)

• After door switch is off, end signal is displayed in the case of manual type and it takes around 2 minute to turn off door switch.

6. WIRING DIAGRAM / PROGRAM CHART

WM3885H*CA

WM3875H*CA

Cool-down

Extra Rinse

Steam Refresh

420 600 120

420 420 120

420

360~720

120120

Allergiene

Perm . Press

60 60 60

120

118

113

Bright Whites

Heavy Duty

103

Towels

7. TEST MODE

7-1. SAFETY CAUTION

Both 120 volts AC and DC voltages are present on the main board. Be careful to avoid a shock hazard. Be careful electric shock when disconnecting parts while trouble shooting. (Wear Electro Static Discharge gloves when working.)

After cutting off the power when changing PWB assembly, disconnect or assemble. Be careful static when handling PWB assembly, and use electro static discharge plastic pack

when handling or storing the board or other components.

7-2. LOAD TEST MODE

The washer must be empty and the controls must be in the off state.

1. Press the SPIN SPEED and SOIL LEVEL buttons simultaneously.

2. Press the Power button, while the above condition. Then buzzer will sound twice.

3. Press the STEAM button to load test mode. Without pressing the STEAM button, you can load demo mode.

4. Press the START/PAUSE button repeatedly to cycle through the test modes.

Number of times the

Start/Pause button is pressed

None

1 time 2 times 3 times 4 times 5 times 6 times 7 times 8 times 9 times

10 times 11 times 12 times 13 times 14 times

Check Point

Turns on all lamps. Tumble clockwise. Low speed Spin. High speed Spin. Inlet valve for prewash turns on. Inlet valve for main wash turns on. Inlet valve for Hot water turns on. Inlet valve for bleach turns on. Inlet valve for steam turns on. Tumble counterclockwise. Heater turns on for 3 seconds. Circulation pump turns on. Drain pump turns on. Steam water level sensor operates. Steam Heater turns on for 1.2 sec.

Display Status

LOAD TEST MODE rpm (42~50) rpm (35~45) rpm (110~117) Water level frequency (0~255) Water level frequency (0~255) Water level frequency (0~255) Water level frequency (0~255) Water level frequency (0~255) rpm (42~50) Water temperature Water level frequency (0~255) Water level frequency (0~255) AG tub water level frequency (0~255) Steam generator temperature

15 times

off

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