On Smart Touch Controllers or Smart DC circuit boards that use LCD screens there is a contrast level setting that controls how dark or faint the letters appear. If this contrast level inadvertintly gets set too low you can increase it by pressing the menu/program button one time then pressing the close button 5 times. This should darken the contrast level by 5 points on a 0-9 scale. The display screen will now continue going through its scrolling mode from the menu/program button being pressed and will end at "CT". The menu/program button can be pressed again to exit from the menu structure and the operator will be ready for normal function.