F1255FD - LG Washing Machine Service Manual (repair manual). Page 14

Be careful of electric shock or disconnecting the parts while trouble shooting.
The voltage of each terminal is 220-240V AC and DC when the unit is plugged in.

7. TROUBLE SHOOTING

7-1.BEFORE SVC SERVICE

7-2. QC TEST MODE.

1. Press the RINSE and SPIN 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.

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

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

None 

1 time 

2 times 

3 times 

4 times 

5 times 

6 times 

7 times 

8 times 

9 times 

10 times 

11 times 

12 times 

13 times 

14 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.

Inlet valve for hot water turns on.

Inlet valve for steam turns on.

Tumble counterclockwise

Heater turns on for 3 sec.

Circulation pump turns on.

Drain pump turns on.

Water level inside the steam generator

Heater turns on for 2 sec

Power off and unlock the door.

rpm (40~50)

rpm 

rpm 

Water level frequency (25~65)

Water level frequency (25~65)

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)

Water level frequency(0~255)

Temperature inside the steam generator

Turn off all lamps.

Number of times the

Start/Pause button is pressed

Check Point

Display Status

Press the Spin and Rinse button simultaneously.

7-3.HOW TO CHECK THE WATER LEVEL FREQUENCY