How to fix a Dyson fan purifier that shows PM2.5 and PM10 as severe | Trusted Reviews
Air quality will not improve - Severe 999 reading showing | Dyson Community
Why Is My Dyson Air Purifier Showing 999? [Easy Fix]
My Dyson TP04 is on 999 and has been for several days. I have taken the filters out, wiped them down(dry, not wet), reset the filter and nothing has helped. I am