Question about Sonicare Philips Flexcare+ with UV Sanitizer HX6942/20

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Sonicare hx9642/20 toothbrush making short humming noises and will tend to turn on on its own. How can I fix this?

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This happened to me as well. One long, two short beeps. Incessantly. Only happens when brush is on the charger.

Try this simple fix first. Hold down the SILVER button for 5 seconds while the toothbrush is on the charging base. If the fix works, it will fix the problem immediately like magic.

If that doesn't work, try this:
1) remove brushhead.
2) use screwdriver in the base and turn 1/4 turn
3) push out assembly from the top
4) dry the inside of of the base handle. allow to air dry
5) allow the switch to air dry
6) reassemble

Posted on Jan 16, 2016


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SOURCE: How do I register my sonicare toothbrush

Go to the Philips website to register your product. The site link is below.
Register your Product Philips Sonicare

Posted on Jan 10, 2015

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Recently my sonicare toothbrush has been turning off and on by itself. Is it trying to tell me something? Or do I have a spirit in my house that happens to have really good oral hygiene?

I just got the same problem Sonicare model HX6932/10 .

It would turn on and off at random on its own. pushing power button didn't help,and usually aggravated it starting a new cycle of random spasms. I tried a "reset" by putting it on charger and holding the silver button for 5 seconds, and it would do some morse code "two short and one long" vibration and beap. And it wouldn't stop until i took it off the charger, but replacing it on the charge it would take up its signaling morse code..
I was able to fix the toothbrush by giving it a couple of smacks against the table. Holding it in my fist i HIT the bottom of it (the charging part) against the table several times.
So far it seems like the toothbrush is fixed. turns on and off when i push the button and no more wierd morse code when i put it in the charger. Just to be safe i did the "reset" again, and i this time i got the morse code "two short one long" vibration with the lights at the bottom flashing in unison, but when i let go of the silver button. the morse code stopped for good.
I think it is fixed. YAY.
update: its still a bit finicky but reseting helps (sometimes i hold both of the buttons and it does the trick - during the reset).

Dec 09, 2010 | Health & Beauty

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