Check two things with this model: if the top slider button has been activated it will turn the brush roll on. If not then you'll have to remove the sole plate and check the sides of the beater bar - sometimes this will get jammed and refuse to turn because clogging of dust or tangled hair/carpet thread takes up the thread wheels at the sides. Sadly this model has a permanent toothed drive belt that can't really be replaced by the owner. However check the slider control on the top of the main body / handle first before doing anything - as you know it has a two option slider - switching on without the brush roll function and switching on with the brush roll activated.