WD-12401TDK, WD-12406TDK - LG Washing Machine Service Manual (repair manual). Page 14

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7. TROUBLESHOOTING
13
7-1. BEFORE PERFORMING SERVICE
Be careful of electric shock or disconnecting the parts while troubleshooting.
Voltage of each terminal in 220-240V~and DC while applying an electric current.
7-2. QC TEST MODE.
Pressing Option,  and Spin button simultaneously.
Power supply on with pressing upper two button. Then buzzer sound twice.
Press the Start/Pause button as follows.
[ Press the Start/Pause button more 4 times until stop spinning ]
7-3. HOW TO KNOW THE WATER LEVEL FREQUENCY
* Press the Rinse and Spin button simultaneously.
The digits means water level frequency (10
-1
kHz)
ex)241 : Water level frequency = 241 X 10
-1
kHz = 24.1 kHz
Pressing number of
[Start/Pause] button
Checking Point
Display Status
None 
1 time 
2 times 
3 times 
4 times 
5 times
6 times 
7 times 
8 times 
9 times 
10 times 
11 times
All lamps turn on
Clockwise spin (right)
Low speed Spin 
High speed Spin
Inlet valve for prewash operation
Inlet valve for mainwash operation
Hot inlet valve in case of hot water fill
Inlet valve for mainwash operation
Counterclockwise spin (left)
Heater is in operation for 3 sec.
Circulation pump operation 
Draining pump operation 
Auto off operation
Drum rpm (About 40~50)
Drum rpm (About 53~65)
Drum rpm (About 120~140)
Water level frequency (25~65)
Water level frequency (25~65)
Water level frequency (25~65)
Drum rpm (About 40~50)
Water temperature
Water level frequency
Water level frequency
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