WD-12NBW - LG Washing Machine Service Manual (repair manual). Page 15

1. Press the Rinse and Temp. 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. TROUBLESHOOTING

7-1. BEFORE PERFORMING SERVICE

Be careful of electric shock when disconnecting parts while troubleshooting.
The voltage of each terminal is 220-240V 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.

7-3. HOW TO CHECK THE WATER LEVEL FREQUENCY

Press the Option and Tub Clean button simultaneously.

None 

1 time 

2 times 

3 times 

4 times 

5 times 

6 times 

7 times 

8 times 

9 times 

10 times 

Turns on all lamps and locks the door.

Tumble clockwise.

Low speed Spin.

High speed Spin.

Inlet valve for prewash turns on.

Inlet valve for main wash turns on.

Tumble counterclockwise.

Heater turns on for 3 sec.

Circulation pump turns on.

Drain pump turns on.

Power off and unlock the door.

rpm (40~50)

rpm (58~65)

rpm (100~120)

Water level frequency (25~65)

Water level frequency (25~65)

rpm (40~50)

Water temperature

Water level frequency (25~65)

Water level frequency (25~65)

Turn off all lamps.

The digits indicate the water level frequency ( x.1 kHz ).

So, for example a display indicating  241: a Water level frequency of 241 x.1 kHz

=  24.1 kHz

Number of times the

Start/Pausebutton is pressed

Check Point

Display Status

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