LG T2165VSA Series Owner's Manual page 24

Press and hold Rinse Button for 3 seconds.
How to Unlock
If you want to unlock, press & hold the Rinse Button 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 the function by pressing "Rinse"
button for 3 seconds.
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