LG T20H7EHHT2 Owner's Manual page 28

OPERATION
28
• When this function is deactivated, a beeper
will sound and the remaining time for the
current cycle will reappear on the display.
Beeper
Use this option to adjust the volume of the sound
and turn the beeper off or on.
• Press and hold the Quick Wash buttons for 3
seconds to adjust the volume of the sound and
turn the beeper off or on.