To reset the pressure sensor, use the following procedure:
- Plug in the charger/Sanitizer unit or the travel charger. Place your toothbrush handle, with brush head attached, on the charger/Sanitizer unit or on the travel charger.
- To perform a factory reset press and hold the Power button, sensitivity plus button and mode button for 2 seconds. If successful you will hear 3 beeps and see the green battery light flash.
If this procedure does not achieve the desired result, the handle will need to be replaced. Contact Philips for a replacement handle.