The reason that this happend is often that there is a lot of wet dust in the way to the condence outlet hose/tank, and the hose can even be blocked. You should clean pipes behind the covers on the right of the low back side, and inside the float-chamber. If you dont clean this, Im afraid you will get the same problem soon again. I guess that its a common problem for all condence dryers .There is probably a need for a reset after the cleaning to get it work again and the light dissapear.
Anders
July 2014