The machine powers on, but I cannot switch modes, adjust the temperature, or change the fan speed settings.

"1. First, try pressing the ""Temperature"" button up, down, left, and right to see if it’s stuck.
2. Unplug the device from the power source, wait 30 seconds to 1 minute, then plug it back in and turn it on.
3. Check the power cord for damage and make sure the plug is fully inserted into the outlet.
4. If none of the above issues apply, please provide a video of the problem so we can verify it and provide standard after-sales service."