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You have to push the button in hard.
Sorry, there was a problem. Please try again later.The button is where your four fingers under the handle are not the super booster button.
Sorry, there was a problem. Please try again later.Hi there! Please try this: As you are pressing the button down, be sure to be pressing it down firmly and run your finger along the length of the switch to ensure that it clicks properly. For further assistance in this matter feel free to give us a call at 1-800-944-9200 M-F from 8am-6pm EST. We look forward to hearing from you! –Michael, Hoover Customer Care
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