Hello, this is Ava with Think Crucial.
There are a number of reasons why your brush roller is not working properly. General maintenance to your vacuum is crucial and will help it work at peak performance.
First things first lets focus on the brush roller. Unplug the vacuum and turn it on its side. Look for any noticeable clumps of debris or hair strands that may be caught in the brush roller. Remove these obstructions, probably best to do so with a scissor if it's hair or long pieces of carpet fibers. After removing the debris try manually rotating the brush roller to uncover other hidden clogs. Another thing to take note of is the condition of the bristles on the roll itself. Are they loose or worn down? These are signs that your brush roller is in need of replacing.
While checking out your brush roll you might as well take a look at your vacuums belt. Your belt should be replaced about every three months. After regular usage, the belt will stretch out, lessening the tension on the brush roller. Lesser tension diminishes the brush roller's turn rate and speed. If the belt feels loose then it certainly is affecting your vacuums suction as well as your brush roll not moving at all.
You can purchase a wide variety of high quality Dyson replacement parts for your Dyson Vacuum direct from Think Crucial with free shipping and an exclusive 10% coupon for Fixya.com readers, use code: FIXYA10 https://www.thinkcrucial.com/search?type=product&q=dyson
I hope this was helpful.
Think Crucial Customer Care http://www.thinkcrucial.com/