If the water level float ball of the Xiaomi Smart Evaporative Humidifier does not rise, you can refer to the following resolutions:
Take out the upper main body, then take out the filter element bracket and filter element in the base, and pull out the float ball cover upwards. After pulling it out, clean the float ball and the cover, and check if there is any foreign matter or scale blocking that causes the float ball to get stuck and not rise. After cleaning, put the float ball inside, and then cover the float ball cover.