What is the back button used for? December 03, 2024 15:36 Updated The back button may be used to navigate to the previous screen. Related articles How do I rename my Gradient unit? What kind of batteries does the remote control take? Is a remote control standard when I purchase an All-Weather 120V heat pump? Is the condensate filter replaceable? How often should I clean the All-Weather 120V heat pump's air filter?