Ensure while setting up the WIFI on your air conditioner and dehumidifier, that it is close to your router, as the unit requires a good signal during the setup process. Your air conditioner is designed to be connected to a 2.4ghz network, and the connection is set up using the TCL "SmartLife-SmartHome" app by ACSmart or TUYA which is also available on the Google Play or Apple store. 

Note:  2023 or newer devices are not compatible with this app.   Those devices require the TCL Home App.