A couple of things could be happening. First you may have a clog in the hose or in the channel where the dirt moves into the bag or into the dirt container. You may also have a filter that is clogged and won’t let air movement through it. Second, If your vacuum has a rotating brush roll , you may have a belt that is broken or stretched and this won’t allow you to pick up anything either. In both cases a simple inspection can solve the problem – Please feel free to call or stop by the store to allow us to assist you.