Question about Stadler Form Ben

Good morning! I would like to say that I use distilled water and have always used that, so never tap water, to avoid limescale build-up in the diffuser. However, it has been two days since it stopped releasing steam. The tank is full, and even when I set the maximum steam output, it does not come out. Only if I blow on the outlet does there seem to be a hint of steam. What could I do to fix it? Thank you very much!