wm3997h lg washer service manual mfl67307985

7/25/2019 WM3997H LG Washer Service Manual MFL67307985

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WASHING MACHINESERVICE MANUALCAUTION

READ THIS MANUAL CAREFULLY TO DIAGNOSE

PROBLEMS CORRECTLY BEFORE SERVICING THE UNIT.

Website:http://biz.lgservice.com

MODEL :WM3997H*A



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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.

watertemperature

washing time

rinsing timethe bestwashingperformance

spin rhythm, time

load

size

NEURO-FUZZY

selectedwashing

temperature

SENSING EFFECTPROCESSING 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



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If it still has severe vibration and noise, regulate a specific spin speed that generates excessive vibration and

noise as follows:

1) Put an unbalance part (rubber) inside of the drum.

2) Start the QC test mode (Refer to section 7-2).

3) Press Delay Wash button, then ‘ ’ is displayed.

4) Press the Spin Speed button repeatedly to select Extra High.

5) Press the Quick Cycle button, the spin speed is displayed.

6) Press the Start/Pause button.

7) Press the Beeper button repeatedly to set spin speed (600, 800, 1000, 1200 rpm) and check if there is vibration

and noise.8) If there is no vibration and noise, increase the spin speed by pressing Beeper button.

9) If there is vibration and noise, rotate the Cycle selector knob clockwise to reduce the Spin Speed (reduce by 50

and 100 rpm). In case of 600 rpm, it can not reduce the spin speed.

10) If vibration and noise are reduced, press the Quick Cycle button to store (2 beep sounds).

* If you want to return to factory default spin speed setting, repeat above steps except step 9).


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HEATING WITHOUT WATER

DRAIN MALFUNCTION



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Replace the thermistor.

6322FR2046C : Dry

Duct

Is the resistance of thermistors on dry duct

2.5k - 180k (at 100 ~ 0

Clean the bellowsDisassemble the cabinet cover andcondensing bellows.

Is there any foreign object in the condensing

bellows.

Disassemble the dry fan assembly and dry

duct upper, and remove foreign objects in

duct and fan.



Be sure to unplug the machine before disassembling and repairing the parts.

CONTROL PANEL

1 Unscrew 2 screws on the back of the top plate.

2 Pull the top plate backward and upward as

shown.

3 Disconnect the Display PWB assembly

connector from the cabling.

4 Pull out the drawer and unscrew 2 screws.

5 Remove one screw.

6 Lift the side the control panel assembly and

pull it out.

7 Unscrew the 8 screws from the control panel

assembly.

8 Disassemble the display PWB assembly.

TOP PLATE ASSEMBLY

CONTROL PANEL ASSEMBLY

DRAWER

CONTROL PANEL ASSEMBLY

DISPLAY PWB ASSEMBLY

". DISASSEMBLY INSTRUCTIONS



MAIN PWB ASSEMBLY

Disconnect the POWER connector and

the pressure switch assembly.

Remove the protective cover.

Unscrew 1 screw on the back.

Remove the main PWB.

Disconnect the connectors.

PROTECT COVER

1

2

3

4

5



((

6



(&

Open the door.

Unscrew the 7 screws from the HINGE COVER.

Put a flat ( - ) screwdriver into the openng of the hinge,and pull out the hinge cover.

Unscrew a screw from the lower side of door.

Disassemble the door upward.

Open the door and disassemble the CLAMP

ASSEMBLY.

Unscrew the 2 screws.

Be careful! The door is heavy.

NOTE

• Reconnect the connector after replacing the

DOOR SWITCH ASSEMBLY.



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Open the door.

Disassemble the clamp assembly.

Tilt the cabinet cover.

Disconnect the door switch connector.

Disassemble the clamp assembly.

Disassemble the gasket.

Lift and separate the cabinet cover.

NOTE : When assembling the

cabinet cover, connect the door switch

connector.

5

6

7

8

9

10

11



DOOR

Open the door.

Unscrew the 4 screws from the hinge.

(Use the 8mm tool.)

DOOR LOCK SWITCH ASSEMBLY

Open the door and remove the gasket using

the special gasket pliers.

Unscrew the 2 screws.

Disassemble the door upward.

NOTE

• Reconnect the connector after replacing

the door switch assembly.

1

3

1

2

2



PUMP

Disassemble the cabinet cover.

Separate the pump hose, the bellows, the

circulation hose assembly from the pump

assembly.

Disassemble the pump assembly.

HEATER


Separate 2 connectors from the heater.

Loosen the nut and pull out the heater.

THERMISTOR


Unplug the white connector from the

thermistor.

Pull it out by holding the bracket of the

thermistor.

CAUTION

• When assembling the heater, insert the

heater into the heater clip on the bottom of

the tub.

• Tighten the fastening nut so the heater is

secure.

CIRCULATIONHOSE

PUMP HOSE

BELLOWS

1

2

3

1

2

3

1

2

3



WHEN FOREIGN OBJECT IS STUCK BETWEEN DRUM AND TUB


Separate the heater from the tub.

Remove any foreign objects (wire, coin, etc.)

by inserting a long bar in the opening.

LAMP ASSEMBLY

Unscrew 2 screws on the back of the top plate.

Pull the top plate backward and upward as

shown.

TOP PLATE ASSEMBLY

1

2

3

1

Disconnect the connector.3

Disassemble the lamp assembly.4

2



MOTOR/DAMPER

NOTE

• If you pull the dampers apart, the must be

replaced. If you do not separate them, they

can be re-used.

Bolt

Rotor

DAMPERHINGE,

DAMPER

Disassemble the back cover.

Remove the bolt.

Pull out the rotor.

1

2

3

Unscrew the 2 screws from the tub bracket.

Remove the 6 bolts on the stator.

Unplug the 2 connectors from the stator.

1

2

3

Disassemble the damper hinges from the tub

and base.

1



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