Unbelievable!! I tried several sites and finally found this one. My brush would start to spin on my Dyson dc28 animal vac but the red light would start flashing immediately after starting. I saw this post and thought, "what the furballs, nothing else is working."
With the machine in the upright position, I turned the machine on its side, bare floor button on the "up" side and deep pile on the "bottom" side. Left it in the upright position and still while on its side, I turned it on, toggled between deep pile and bare floor buttons 5X, ending on the deep pile button. It's worth noting that after the deep pile button was pushed, the brush seemed to go into a 15 second or so adjustment that I waited on each time before hitting the bare floor button. I then turned the unit off and while still having it on its side, I kicked it from upright to what would be the reclined operating position if it was standing, turned it on and could not believe this worked!
theres, August 2020