I havr an Electrolux Oxygen 3 canister vac and I was vacuuming and the power head stopped working didn't hear anything break or smell any burning. Checked roller and belt everything is fine. But when I turn on the vacuum everything works fine then I hit the button to turn on the power head and nothing happens. Press it again and the power shuts off. What's going on? Can I reset the vacuum? If so how?