In case you have the same issue, just press the “on” button for 20 seconds, the same solution needed when Sonicare has this problem. The Aquacare seems to clean just as well as Sonicare, is slightly (0.6 ounces) lighter, has a battery that lasts twice as long (four weeks versus two), and comes with more brushes (eight one).
https://www.amazon.com/AquaSonic-Black-Ultra-Whitening-Toothbrush/dp/B072YVWBXH

