LG WM3670H A Series User manual

MODELS : WM3670H*A
WASHING MACHINE
SERVICE MANUAL
REA D THI S M A N UA L CA REFULLY TO DI A GNOSE
PROBLEMS CORRECTLY BEFORE
SE RV I CI N G THE UN I T.
CA UTI ON
CONFIDENTIAL
Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication, modification, copying or
transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity
from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in
this Service Manual.
Copyright © 2016 - 2017 LG Electronics Inc. All rights reserved. Only training and service purposes.

CONTENTS
1. Specifications .................................................................................................................................. 3
2. Features and Technical Explanation ............................................................................................ 4-6
3. Parts Identification ........................................................................................................................... 7
4. Installation and Test ................................................................................................................... 8-10
5. Operation ................................................................................................................................. 11-17
5-1. Control Panel Features ..................................................................................................... 11-13
5-2. Cycle Guide ........................................................................................................................... 14
5-3. Special Functions ................................................................................................................... 15
5-4. Explanation of Each Process ............................................................................................ 16-17
6. Test Mode ...................................................................................................................................... 18
6-1. Safety Caution ....................................................................................................................... 18
6-2. Load Test Mode ..................................................................................................................... 18
6-3. How To Read the Display in Load Test Mode ........................................................................ 18
7. Troubleshooting ............................................................................................................................ 19
7-1. Safety Caution ....................................................................................................................... 19
7-2. Error Mode Summary ....................................................................................................... 19-20
7-3. Troubleshooting With Error ............................................................................................... 21-27
7-5. Before using the Tag On function ..........................................................................................3
7-4. Troubleshooting Else ........................................................................................................ 28-3
8. Component Testing Information .................................................................................................... 3
8-1. Filter Assembly (Line Filter) ................................................................................................... 3
8-2. Door Look Switch Assembly ............................................................................................. 3-36
8-3. Stator Assembly ................................................................................................................3
8-4. Pump Motor Assembly ...........................................................................................................
8-5. Inlet Valve Assembly ..............................................................................................................
8-6.  .......................................................................................................
9. Disassembly Instructions ........................................................................................................... 4-
10. Exploded View ......................................................................................................................... 5-5
11. Wiring Diagram ............................................................................................................................. 5
10-1. Cabinet and Control Panel Assembly ................................................................................... 5
10-2. Drum and Tub Assembly ...................................................................................................... 5
10-3. Dispenser Assembly ............................................................................................................. 5
5Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

1. SPECIFICATIONS
WM 3670H*AIT E M
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
ELECTRIC POWER
CONSUMPTION
REVOLUTION
SPEED
WASHING
DRAIN MOTOR
WASH HEATER
WASH
SPIN
8
5
5
Steam, Pre Wash, Delay Wash, Add Garments, Fresh Care,
Cold Wash, Extra Rinse, Rinse+Spin, Water Plus
Incorporated
14.5 – 142 PSI(100 – 980kPa)
Electronic
(4. 5DOE)
27”(W) X 29 3/4”(D) X 38 11/16”(H), 51”(D, door open)
up to 19 hours
PTC + Solenoid
10 steps (by sensor)
Incorporated
Incorporated
Incorporated
Incorporated
240 W
80 W
1000 W
46 rpm
0-1,300 rpm
Blue White, Silver
AC 120 V, 60 Hz
196.2lb (89kg)
To reduce therisk of inju ry topersons, adhere toall industry
recom flongoesuehtgnidulcniserudecorpytefasdednem
sleevedglovesand safetygl asses.F ailure to follow all of
the safety warnings in this manual could result in property
damage, injury topersons ordeath.
WARNING
SMART NFC (Tag On function)
Smart Diagnosis function (3.0)
Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

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.
Automatic Wash Load Detection
Automatically detects the load and optimizes the washing time.
Child Lock
The child lock prevents children from pressing any button to change the settings
during operation.
SMART DIAGNOSIS TM
Should you experience any technical difficulty with your washing machine, is capable
of producing multiple distinct different motions for optimal washing performance
with very little noise and vibration. The motor assembly also contains fewer moving
parts, thus resulting in fewer repairs.
NFC (Tag On Function)
This feature uses LG Smart DiagnosisTM, Cycle Download, and Laundry Stats when
you touch the LG appliance’s Tag On logo with your NFC equipped smartphone.
7Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

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.
water
temperature
washing time
rinsing time
the best
washing
performance
spin rhythm, time
load
size
NEURO-
FUZZY
selected
washing
temperature
SENSING EFFECT PROCESSING DETERMINATION
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.
2-4. DOOR CONTROL
8Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

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. 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 c hildlock is set, CHILD LOCK lights and all buttons are dis abled except the POWER
butt on. 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,
.sdnoces3rofnottubhsaWerPehtdlohdnasserP
2-7. NFC (Tag On Function)
The Tag On function can only be used with smart phones equipped
with the NFC function and based on the Android operating system (OS).
Position your smart phone so that the N FC antenn a on the bac k of
your smart phone matches the position o f the Tag On icon on the appliance .
NFC reading performance of your smart phone must be higher than
a certain level for using this function.
9Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

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Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

1
2
3
4
5
6
7
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 VAC, remove the transit bolts, level the washer, etc.)
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 4 shipping bolts
with the supplied wrench.
Remove the lower bolts fist.
It is easier that way.
Keep the shipping bolts and
spanner for future use.
Insert the 4 caps (provided)
into the hole.
Turn clockwise to raise;
counterclockwise to lower.
Turn the leveling feet to
adjust the appliance.
REMOVE THE SHIPPING
BOLTS
INSTALL THE APPLIANCE
ON A FLAT AND FIRM SURFACE
ADJUST THE
LEVELING
4. INSTALLATION & TEST
Keeping
;Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

CONNECT POWER PLUG
• Connect the power plug to the wall outlet.
• Avoid connecting several electric devices,
as doing so may cause a fire.
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.
HOW TO CONNECT THE INLET HOSE
CONNECT THE DRAIN HOSE
• Make sure that the hose is not twisted.
The end of the drain hose should be placed less than 96” from the floor.
• Avoid submerging the end of the hose.
<Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

7TEST OPERATION
1Preparation for
washing.
• Connect the power plug to the
outlet.
• Connect the inlet hoses.
2Press the POWER button. 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.
• Check if the drum rotates
clockwise and counterclockwise.
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.
• Listen for a click to determine if the
door is unlocking.
8Press the START/PAUSE
button.
9Water removal
• If SERVICE is needed during
check, remove the remaining
water by pulling out the hose cap.
43 Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

WM3670H*A
ENGLISH
5. OPERATION
5-1. CONTROL PANEL FEATURES
Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

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Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

Option Button
t
t
t
t
t
t
t
t
Pre Wash : Use the Pre Wash button to select to wash temporary before to start the course which
you chosen.
Delay Wash : Once you have selected the cycle and other settings, press this button to delay the
start of the wash cycle.
Add Garments : Use the Add Garments button to to add garments during cycle.
Cold Wash™ : Use this function to wash without hot water and heating.
Extra Rinse : This option will add an extra rinse cycle to the selected cycle.
Rinse+Spin : Use this option to rinse detergent from load.
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.
Water Plus : To add water during wash and rinse cycle.
event wrinkles.
Wash Temp., Spin speed, Soil Level, Signal Button
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Steam : Use this option for extra cleaning power.t
t
Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

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Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

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Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Onl
y
trainin
g
and service purposes.

5-4. Explanation of each process
No. noitanalpxEssecorP
1. Stay • Electrical power is supplied.
• Washer is ready to work and the micom is in the active mode.
2. Water
supply
• 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.
3.
Soaking
and washing
laundry
• To get laundry wet, drum rotates clockwise and counterclockwise.
• If water amount is insufficient at this time, the Inlet valve will supply
water again.
4.
Heating and
washing
• The heater heats the water in drum to the selected water temperature
and drum rotates for washing.
5.
6.
Washing
and heating
/ 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.
7. Washing • Fuzzy logic decides washing time according to the laundry load, water
temperature, and other factors.
8. 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
eccent-
ricity)
• 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.
49 Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

No. noitanalpxEssecorP
10 Intermittent
spin
• 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.
11 Rinse
spin
• 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.
12 Remaining
spin
• After spin finishes, the drum rotates by remaining spin power until it
stops. Motor power is off.
• This process is overlapped with next process.
13 Rinse water
supply
• Water supply for rinse process.
14 Rinse • Rinsing process.
15 Last
drainage
• 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.
16 Disentangling • The same as item 9.
17
Intermittent spin
• The same as item 10.
18
19
20
21
22
Main spin1 • The same as item 11.
Main spin2 • At the end of a main spin, the spin speed will reach the selected rpm.
Remaining spin • The same with item 12.
Disentangling • After spin finishes, disentangling starts to remove unbalanced
laundry.
End • After ‘end’ signal is displayed, it stays for 8 seconds and power is
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.
4: Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

6. TEST MODE
SPIN SPEED SOIL LEVEL
WASH/RINSE DELAY WASH
Turns on all lamps and locks the door.
]TXU
]TYU
^
]TZU
18 Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

7. TROUBLESHOOTING
^TXU
^TYU
4< Copyright © 2016 - 2017 LG Electronics Inc. All rights
reserved. Only training and service purposes.

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