DOWNLOAD LG WD-MD750WM Service Manual ↓ Size: 58.44 MB | Pages: 44 in PDF or view online for FREE

16

Program Chart

2

1:07

1

45

00

2:46

1:41

1:00

1:45

1:00

Wool

Cotton

Cotton Eco

Sport Wear

Mix

Duvet

Intensive 60

Easy Care

Skin Care

Delicate

1560

100

1560

720

2:19

90

24

420

26

420

14

420

40

720

20

480

67

57

480

25

480

Baby Care

Rinse+Spin

Quick 30

40

420

30

420

36

660

17

360

Before servicing ask the customer what the trouble is.
Check the adjustments. (Power supply :220-240V~, Removal of transit bolts etc..)
Check the troubles referring to the troubleshooting.
Decide service steps referring to disassembly instructions.
Then, service and repair.
After servicing, operate the appliance to see whether it works OK or NOT

17

7. TROUBLESHOOTING

7-1. BEFORE PERFORMING SERVICE

7-2. LOAD TEST MODE

1 F**B9(Q/T)D(T) : Press and Hold  ‘

Temp.

’ 

& ‘

Spin

’

buttons and then press ‘

Power

’ button.

7-3. HOW TO KNOW THE WATER LEVEL FREQUENCY

F**B9(Q/T)D(T) : Press and Hold ‘

Spin.

’ & ‘

Pre Wash

’ buttons simultaneously.

2 The washer must be empty and the controls must be in the off state.
3 Press Power with above two buttons pressed and then buzzer will sound.
4 Press the Start/Pause button repeatedly to cycle through the test modes

1
2
3
4

5
6

None 

1 time 

2 times 
3 times 

4 times 
5 times 

6 times 
7 times 
8 times 
9 times 

10 times 

All lamps turn on
Clockwise spin (right) 
Low speed Spin 
High speed Spin

Inlet valve for pre-wash operation
Inlet valve for main-wash operation
Hot inlet valve in case of hot water fill
Inlet valve for main-wash operation
Counterclockwise spin (left) 
A Heater is in operation for 3 sec.
Draining pump operation 
Auto off operation

Motor rpm (About 47)
Motor rpm (About 590~650)

Motor rpm (About 1100~1250) : F10**(Q/T)D(T)(3)(1~9)
Motor rpm (About 1100~1250) : F12**(Q/T)D(T)(3)(1~9)

Motor rpm (About 1350~1400) : F14**(Q/T)D(T)(3)(1~9) 

Water level frequency (225~265)

Water level frequency (225~265)

Water level frequency (225~265)

Motor rpm (About 47)
Water Temperature

Water level frequency

The digits means water level frequency (10

-1

kHz)

ex) 241 : Water level frequency = 241 X 10

-1

kHz

= 24.1kHz

Pressing number of

[Start/Pause] button

Checking Point

Display Status

F**B9(Q/T)D(T)

Cotton Eco

Easy Care

Duvet

     Delicate

Wool

18

7-4. ERROR DISPLAY

If you press the [Start/Pause] button when an error in displayed, any error except software ERROR will
disappear and the machine will change into pause status.
In case of        ,        ,        , if the error is not resolved within 15 sec. In case of other errors, if the
error is not resolved within 4 min. Power will be turned off automatically and the error only will be
blinked. But in the case of       , power will not be turned off.

• Load is too small.

• Load is out of balance.

• The appliance has an imbalance detection

and correction system. If individual heavy

articles are loaded (ex. bath mat, bath robe,

etc.) this system may stop spinning or even

interrupt the spin cycle altogether.

• If the laundry is still too wet at the end of the

cycle, add smaller articles of laundry to

balance the load and repeat the spin cycle.

• Water supply is not adequate in area.

• Water supply taps are not completely open.

• Water inlet hose(s) are kinked.

• The filter of the inlet hose(s) are clogged.

Check another tap in the house.

Fully open tap.

Straighten hose(s).

Check the filter of the inlet hose.

Clean and straighten the drain hose.

Clean the drain filter.

Add 1 or 2 similar items to help 

balance the load.

Rearrange load to allow proper 

spinning

Close the door.

If it is not released, call for service.

Unplug the power plug and call for 

service.

Close the water tap.

Unplug the power plug.

Call for service.

• Drain hose is kinked or clogged.

• The drain filter is clogged.

• Is the door opened?

• Water overfills due to the faulty water valve.

• Water level sensor has malfunctioned.

WATER INLET

ERROR

WATER OUTLET

ERROR

UNBALANCED

ERROR

DOOR OPEN

ERROR

THERMISTOR

(HEATER)

ERROR

OVERFLOW

ERROR

PRESSURE

SENSOR

ERROR

• Over load in motor.

• Over load in motor.

CURRENT

ERROR

MOTOR

LOCKED

ERROR

7-5. TROUBLESHOOTING WITH ERROR

Water Inlet Error (IE)

Is the water tap closed ?

[Note] Environmental safety check list

1. No water tap leakage & freeze.

2. No entanglement of water supply hose.

.

e

g

a

k

a

e

l 

e

s

o

h

 

y

l

p

p

u

s

 r

e

t

a

w

 

o

N

 .

4

.

e

g

a

tr

o

h

s

 r

e

t

a

w

 

o

N

 .

3
5. No the inlet filter clogged.

Check the 

Water tap

and  open it fully .

When there is water in the tub,
is the water level frequency
over 25.5KHz ?

Reconnect or repair the 

Connector

.

Or replace the 

Harness

.

Replace the 

Inlet Valve

.

Is the 

Connector

connected correctly to 

the 

Main PCB

and the 

Inlet Valve

?

Or is the 

Harness

alright ?

Check the 

Air Chamber

and 

the Tube

(clogged) 

And When you check the water level frequency again, 
if it is over 25.5KHz, you replace 

the Pressure switch.

YES

YES

NO

NO

Replace the 

Main PCB

.

NO

YES

YES

NO

NO

Is the each resistance of Inlet Valve within
3.5 ~4.5 kΩ ?

When the washing machine is started, 
is operated the inlet valve? 

Pre. Valve

Main Valve

19

1

2

1

2