A Carrier thermostat includes a number of displays and features that allow you to understand what kinds of things your furnace and air conditioning units are doing and what sorts of functions require maintenance work from you. After you have replaced an air filter, installed a new humidifier pad or inserted a new ultraviolet lamp, you should reset the thermostat so the display is accurate.
Press the "Left" button and hold. The "Accessory status" screen will appear.
Press the "Scroll" button to select the accessory you want to reset.
Press the "Right" button to reset the selected setting.
Press the "Left" button to return to the normal display.