GK712EN - LG Washing Machine Service Manual (repair manual). Page 17

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16
8. TROUBLESHOOTING
8-1. 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.
8-2. QC TEST MODE.  
Pressing  RINSE, 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
Pressing number of
START/PAUSE button
Checking Point
Display Status
None
All lamps turn on
1 time
Clockwise spin (right)
Motor rpm (About 45)
2 times
Low speed spin
Motor rpm (About 63~67)
3 times
High speed spin
Motor rpm (About 100~106) :
GK710E / GK710EN
Motor rpm (About 114~117) :
GK712E / GK712EN
4 times
Inlet valve for pre-wash operation
Water level frequency (25~65)
5 times
Inlet valve for main-wash operation
Water level frequency (25~65)
Hot inlet valve in case of hot water fill
6 times
Inlet valve for main-wash operation 
Water level frequency (25~65)
7 times
Counterclockwise spin (left)
Motor rpm (About 45)
8 times
A Heater is in operation for 3 sec.
Water Temperature
9 times
Draining pump operation
Water level frequency
10 times
Auto off operation
■ 
GK710E / GK710EN / GK712EN / GK712E 
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