LG T70SJBK1Z Owner's Manual page 28

Press and hold Beeper and Rinse Button simultaneously for 3 seconds.
How to Unlock
If you want to unlock, press & hold the Beeper and Rinse Button simultaneously for 3 seconds again.
the remaining time are alternatively shown on the display while they are locked.
Power On/Off button can operate while Child Lock function is activated.
• The child lock is set, it will not be released
automatically even if the cycle is terminated.
Thus, you should turn power on washing machine
•
and then terminate function by pressing "Beeper
and Rinse" button simultaneously for 3 sec.
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