What should I do when the 'Filter blocked' alert appears?
When the Filter blocked alert appears, your straightener will not operate until the filter is cleaned. You should follow the filter cleaning instructions by removing, soaking, washing, and fully drying the filter before refitting it. You can also scan the QR code shown on the screen for additional guidance. (Page 13)
From the official Dyson Airstrait Straightener manual, page 13
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