To delete the Wi-Fi credentials saved on your Smart AC Control, touch the main display of the device for more than 10 seconds. This will open the service menu, recognizable by a screwdriver and wrench symbol.
Use the arrow buttons to cycle through the menu until you are at the menu item showing a Wi-Fi symbol with a trash can next to it. Touch the main area of the display to delete the Wi-Fi credentials. Blinking of the Wi-Fi Symbol and trash can confirms the deletion.
After deleting your Wi-Fi credentials, you can enter new ones using the Smart AC Control access point mode.