WTR11D81EP, WTR-15D81EP - LG Washing Machine Service Manual (repair manual). Page 24

Delay Start (Reservation) Wash is used to delay the finishing time of the operation. The hours to be
delayed can be set by the user accordingly. The time on the display is the finishing time, not the start time. 

Press the POWER button to turn power on.

Press the PROGRAM button to select the washing program.

Press the Delay Start (Reservation) button. 

Add the Detergent.

Select the  program for laundry on the Control panel.
This program will not work in Wool, Delicates and Spin Only Program.

When the lid is open the machine will not operate, and an alarm
signal will remind you to close the lid

The light will ‘ Delay’ turn on and ‘TIME  LEFT’             will be
marked.

Press the button repeatedly to set the desired finishing time. For
example, To finish washing in 9 hours from now,  by make the number
9:00 pressing the Delay Start (Reservation) button repeatedly.

(RES.=Delay)

Add the laundry and press the START/PAUSE button.

Close the lid.

Finish

When you press the START/PAUSE button the light will
blink.

Water will be supplied for 2 minutes after the start of the wash to
supplement the water the laundry has absorbed. 

The washing will be finished according to the delayed time.

Finishing time can be delayed from 3~48 hours. Delaying from 3~12 hours can be done in 1 hour time
intervals and from 12~48 hours in 2 hour time intervals. 
If the lid is open, the machine will not work, and  an alarm signal will alarm to remind you to close the lid. 
To select water level, water temp. or soil level manually, press the Delay Start (Reservation) button  and
select the desired option. Then press the START/PAUSE button.
When the laundry cannot be taken out immediately after the wash program ends, it is better to omit the
spinning program. (The laundry will be wrinkled if left for a long time after spinning.)