Just to add, I'm afraid I didn't find a fix for the problem yet though, despite accessing the inside of the machine. I also just post a question asking how this can be fixed.
From what I understand you can just pull it off. I have the same problem with my steam knob continually turned and not closing/turnjng off anymore. I unscrewed the 5 screws underneath so I could remove the silver part on top, and just pulled the steam knob off firmly and carefully. I think that's the only way to take it off.
I can answer this question...
How do I remove the broken steam knob from my Delonghi Icona?
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