... of low digit of the LCD.4.2 Factory default:Press F_KEY button to display FL, and 00 blinks ... 4.5 Set the mark if F1 is effective Press F_KEY to display FL, 00 will blink at the ... 4.6 Set the mark if F2 is effective Press F_KEY to display FL, 00 will blink at the same ... is no button pressing or no input signal changing, the LCD back light will turn to energy saving status after 30s. elevator LCD display ...