Next to the ‘Check Filter’ light, there is a small circular arrow with reset written underneath it. While it looks like a button, there is in fact a small hole in the middle of the circular arrow. You need to put a thin object such as a Toothpick or unwound Paperclip into that hole and press for at least 5 seconds. This will reset the ‘Check Filter’ light.
Watch the video to see how to reset the filter light (6.15m into the video).