GCWP1069LS, GCWP1069QS - LG Washing Machine Service Manual (repair manual). Page 20

8. TROUBLESHOOTING

8-1. BEFORE PERFORMING SERVICE

8-2. QC TEST MODE.

Be careful of electric shock when disconnecting parts while troubleshooting.

Card Type

The washer must be empty.

1. Insert Service Card
2.

Display

3. Press the Start button repeatedly to cycle through the test modes.

8-3. HOW TO CHECK THE WATER LEVEL FREQUENCY

8-4. HOW TO CHECK THE RPM

Press and hold the ADD SUPER WASH and WARM buttons simultaneously.

Press the ADD SUPER WASH AND HOT button simultaneously.

When you check the water level, the first digit is a 0 which means 2. 
A display indicating 041 is a water level frequency of 241 multiplied by 0.1 KHz , for an
actual frequency of 24.1 KHz. 

Under 200 rpm: The display indicates the rpm. (Under 200 rpm) 
Over 200 rpm: The display indicates the rpm. (x 10 rpm)
So, for example a display indicating 050 : rpm of 050 x 10 rpm = 500rpm 

Coin Type

1. Turn on/off  toggle switch
2.

Display

3. Press the Start button repeatedly to cycle through the test modes.

The voltage of each terminal is 220V- when the unit is plugged in.

OPL Type
1. Push the Hot and Cold button at the same time.
2. Push the Warm button 3 times.
3. Lpc1 Display
4. Press the Start button repeatedly to cycle through the test modes.

Number of times the 

START button is pressed

Check Point

Display

None
1 time

2 times
3 times
4 times
5 times
6 times
7 times
8 times
9 times

10 times

12 times
13 times
14 times
15 times
16 times

Turns on all lamps and locks the door

Displays 1U:XX, 1g:XX and 12:X0 alternatly (Version)

rpm (40~50)
rpm (600)
rpm(1150)
Water level frequency (261~)
Water level frequency (261~)
Water level frequency (261~)
Water level frequency (261~)
rpm (40~50)

Water level frequency (261~)

Displays 1U:XX, 1g:XX and 12:X0 alternatly (Version)

rpm (1150)

Tumble Clockwise.
Low Speed Spin
High Speed Spin
Inlet valve for main water turns on.
Inlet valve for hot wash turns on.
Inlet valve for softener turns on.
Inlet valve for bleach turns on.
Tumble counter clockwise.

Drain Pump turns on
Turns on all lamps.

Displayed 0XX 

Turn on Circulation Pump

Button Checks.
High Speed Spin

PDA Signal Check

This function is not applied in this machine

11 times(  )

*

* This machine do not use circulation system