Remove the plastic top cover

Remove the UV lamp from the Water System

wait 5 seconds then re-insert into Water System, being sure that the UV lamp is fully inserted

The letter U or N will appear onscreen

Press the blue cold dispense button once or twice to cycle between U (for USED) and N (FOR NEW) in this case we will want the screen to show the letter U onscreen

Press the menu button to confirm your selection

Try to dispense cold water