LG WM3987H Series User manual

WASHING MACHINE
SERVICE MANUAL
CAUTION
READ THIS MANUAL CAREFULLY TO DIAGNOSE
PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.
Website:http://biz.lgservice.com
MODEL : WM3987H*

NOV. 2009PRINTED IN KOREA P/No.: MFL30138960

22
CONTENTS
1. SPECIFICATIONS .........................................................................................................................3
2. FEATURES & TECHNICAL EXPLANATION ................................................................................ 4
3. PARTS IDENTIFICATION ............................................................................................................ 7
4. INSTALLATION & TEST ............................................................................................................... 8
5. WIRING DIAGRAM ......................................................................................................................11
6. OPERATION ................................................................................................................................12
7. TROUBLESHOOTING.................................................................................................................14
7-1. BEFORE PERFORMING SERVICE ...................................................................................14
7-2. QC TEST MODE.................................................................................................................14
7-3. HOW TO CHECK THE WATER LEVEL FREQUENCY ......................................................14
7-4. ERROR DISPLAY ...............................................................................................................15
8. ERROR DIAGNOSIS AND CHECK LIST ....................................................................................17
8-1. DIAGNOSIS AND SOLUTION FOR ABNORMAL OPERATION ........................................17
8-2. FAULT DIAGNOSIS AND TROUBLESHOOTING ..............................................................20
9. DISASSEMBLY INSTRUCTIONS ...............................................................................................31
10. EXPLODED VIEW .....................................................................................................................40
10-1. CABINET & CONTROL PANEL ASSEMBLY....................................................................40
10-2. DRUM & TUB ASSEMBLY................................................................................................41
10-3. DISPENSER ASSEMBLY .................................................................................................42
10-4. DRYER............................................................................................................................. 43

3
1. SPECIFICATIONS
ITEM WM3987H*
COLOR
POWER SUPPLY
PRODUCT WEIGHT
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
ERROR DIAGNOSIS
AUTO POWER OFF
CHILD LOCK
RLM ENABLE
ELECTRIC
POWER
CONSUMTION
REVOLUTION
SPEED
WASHING
DRAIN MOTOR
WASH HEATER
WASH
SPIN
46 rpm
0 - 1200 rpm
9
5
5
Prewash, Extra Rinse, Stain Cycle, Water Plus, Drum Light Tub Clean,
SPINSENSETM‚ Delay Wash
Incorporated
14.5-116 psi (100-800 kPa)
Electronic
3.63 (4.2IEC)
27" (W) X 293/4" (D) X 3811/16" (H), 5013/16" (D, door open)
up to 19 hours
PTC + Solenoid
10 steps (by sensor)
Incorporated
Incorporated
Incorporated
Incorporated
-
280 W
80 W
1000 W
BLUE WHITE
AC 120 V, 60 Hz
201 lbs (91kg)

4
2. FEATURES & TECHNICAL EXPLANATION
2-1. FEATURES
Direct Drive System
The advanced Brushless DC motor directly drives the drum
without belt and pulley.
Tilted Drum and Extra Large Door Opening
The tilted drum and extra large door opening make it possible
to load and unload easily.
Water Circulation
Spray detergent solution and water onto the load repeatedly.
Clothes are soaked more quickly and thoroughly during the wash cycle.
Detergent suds are eliminated more easily by the water shower
during rinse cycle. The water circulation system uses both
water and detergent more efficiently.
RollerJets
The washing ball enhances wash performance and reduces
damage to 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
The internal heater automatically heats the water to the optimum
temperature on selected cycles.
Child Lock
The Child lock feature prevents children from pressing any buttons
to change the settings during operation.
ᆺં໺ቚ လ࿥

5
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.
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.
2-2. 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.
NEURO-
FUZZY
load
size
selected
washing
temperature
water
temperature
washing time
rinsing time
spin rhythm, time
the best
washing
performance
SENSING PROCESSING DETERMINATION EFFECT

6
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 intertial 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 PRE WASH 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 washer while it is operating.
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. 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 Rinse+Spin 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.

7
3. PARTS IDENTIFICATION
ACCESSORIES
Wrench
Tie strap (Option)
to secure drain hose to standpipe,
inlet hose, or laundry tub
Hot/Cold (1 each)
Hose
Non-skid pads Caps(4)
(for covering shipping
bolt holes)
Elbow Bracket
(for securing drain hose)

8
Before servicing, ask the customer what the trouble is.
Check the setup (power supply is 120V 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 first lower side to remove easily.
Keep the shipping bolts and
spanner for future use.
Insert the 4 caps
(provided) into the hole.
Turn clockwise to raise;
counterclockwise to lower.
4. INSTALLATION & TEST

99
CONNECT THE DRAIN HOSE
CONNECT POWER PLUG
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.
The end of the drain hose should be placed less than 100 cm from the floor.
Connect the power plug to the wall outlet. Avoid connecting several electric devices, as
doing so may cause a fire.
Make sure that the hose is not twisted. Avoid submerging the end of the hose.

10
TEST OPERATION
1
Preparation for
washing.
•Connect the power plug to
the outlet.
•Connect the inlet hose.
3Press the Start/Pause
button.
•Listen for a click to determine if
the door has locked.
6Check the water heating
function.
•Press the WASH/RINSE button
and the present temperature will
be displayed.
5Check the automatic
reverse rotation. 4Check the water supply.
•Check if water is supplied
through the detergent dispenser.
7Check 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.
8Press the
START/PAUSE button.
9Water removal.
•If SERVICE is needed during
check, remove the remaining
water by pulling out the hose cap.
2Press the POWER button.
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5)@
•Listen for a click to determine
if the door is unlocking.
7
•Check if the drum rotates
clockwise and counterclockwise.

11
5. WIRING DIAGRAM

12
6. OPERATION
SSAANNIITTAARRYY
SSPPEEEEDD WWAASSHH
BBUULLKKYY//LLAARRGGEEPPRREEMM..PPRREESSSS
DDEELLIICCAATTEE
RRIINNSSEE++SSPPIINN
CCOOTTTTOONN//NNOORRMMAALL
Power Button
• Use this button to turn the power
On/Off.
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.
Status Indicator
•It shows elapsed time of the cycle the washer
is operating.

13
WWASH/RINSEASH/RINSE SPIN SPEEDSPIN SPEED SOILSOIL LEVEL LEVEL DDRRYY
EEXXTTRRAA HHOOTT//CCOOLLDD
HOT/COLDHOT/COLD
WWARM/WARM/WARMARM
WWARM/COLDARM/COLD
COLD/COLDCOLD/COLD
EXTRAEXTRA HIGH HIGH
HIGHHIGH
MEDIUMMEDIUM
LOWLOW
NO SPINNO SPIN
3300//6600//9900//112200((MMIINN))
MOREMORE
NORMALNORMAL
LOWLOW TEMPTEMP..
HEAHEAVYVY
▼▼
▼▼
NORMALNORMAL
LIGHTLIGHT
WWAASSHHRRIINNSSEESSPPIINNDDRRYY
TUB CLEANTUB CLEAN
WASH/RINSE, SPIN SPEED, SOIL LEVEL 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.
DRY SELECTOR
• Dry program can be selected
by pressing the DRY button.
• By pressing the DRY button,
[NORMAL MORE
30/60/90/120 LOW TEMP.
DAMP] can be selected.
Option Button
•PREWASH : Use this option for loads that need pretreatment. It adds 16 minutes prewash and
a spin cycle.
•EXTRA RINSE: This option provides an additional rinse.
•STAIN CYCLE: Adds time to the wash and rinse cycles for better stain removal.
Automatically provides a rinse.
•WATER PLUS: Add extra water to the wash and rinse cycles for superior results.

14
7. TROUBLESHOOTING
7-1. BEFORE PERFORMING SERVICE
Be careful of electric shock when disconnecting parts while troubleshooting.
The voltage of each terminal is 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 SPIN SPEED and SOIL LEVEL 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 Spin and Rinse 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 ).
Number of times the
Start/Pause button is pressed
Check Point Display Status
None Turns on all lamps and locks the door.
1 time Tumble clockwise. rpm
2 times Low speed Spin. rpm + Water Level
3 times High speed Spin. rpm + Water Temperature
4 times Inlet valve for prewash 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 steam turns on. Water level frequency (25~65)
8 times Inlet valve for bleach turns on. Water level frequency (25~65)
9 times
Tumble counterclockwise. rpm (42~50)
10 times Heater turns on for 3 sec. Water temperature
11 times
Circulation pump turns on. Water level frequency (25~65)
12 times
Drain pump turns on.
Water level frequency (25~65)
13 times Off -

15
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 the in 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. But 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 things 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 213).
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

16
ERROR SYMPTOM CAUSE
OVER
CURRENT
ERROR
•
MAIN PWB ASSEMBLY is out of order.
•
Winding in the STATOR ASSEMBLY is short-circuited.
• The connector (3-pin, male, white) in the MOTOR
HARNESS is not connected to the connector
(3-pin, female, white) of STATOR ASSEMBLY.
• The electric contact between the connectors
(3-pin, male, white) in the MOTOR HARNESS
and 4-pin, female, white connector in the MAIN PWB
ASSEMBLY is bad or unstable.
• The MOTOR HARNESS between the STATOR
ASSEMBLY and MAIN PWB ASSEMBLY is cut (open
circuited).
• The hall sensor is out of order/defective.
8
9
LOCKED
MOTOR
ERROR
• Loose Ball Sensor Connector.
• Ball Sensor is out of order.
Displayed only when the START/PAUSE button is first
pressed in the QC Test Mode.
10
BALL SENSOR
ERROR
•
The washer experienced a power failure.
12
POWER
FAILURE
•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 cannector.
•The Dry Fan Motor is out of order.
-Replace the fan motor.
13
DRY HEATER
ERROR
• EEPROM is out of order.
Displayed only when the START/PAUSE button is first
pressed in the QC Test Mode.
11
EEPROM
ERROR

17
8-1. DIAGNOSIS AND SOLUTION FOR ABNORMAL OPERATION
8. ERROR DIAGNOSIS AND CHECK LIST
SYMPTOM GUIDE FOR SERVICE CALL
No power
Water inlet trouble
Is the power plug connected firmly to
120V AC outlet?
Power failure? or Breaker opened?
Is the outlet controlled by a switch?
Visit to service.
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 service.
Clean the filter of
inlet valve

18
SYMPTOM GUIDE FOR SERVICE CALL
Door error
Drain trouble
Was the load too large?
Visit to service.
Visit to service.

19
SYMPTOM GUIDE FOR SERVICE CALL
Suds overflow from the
appliance.
(In this condition, wash and
spin do not operate normally)
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5)@
Is a low-sudsing detergent used?
Is the proper amount of detergent used
as recommended?
Recommend to reduce the amount
of detergent.
Is liquid laundry product put in the correct
compartment of the dispenser?
Is the cap clogged?
Explain proper use of liquid laundry products.
Clean the compartment.
Visit to service.
LOW-SUDSING
This appliance has an automatic suds sensing function which
prevents overflow.
When excessive suds are sensed, the suds removing
implementations such as drain, water input, pause will operate,
without rotating the drum.
Liquid laundry products do not
flow in.