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Phillips sonicare toothbrush keeps turning on by itself and function lights stopped working

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My flexcare began randomly turning itself on about a week ago. When charging it would vibrate a pattern of one short, then 2 short bursts. After talking with tech support and finding my flexcare was out of warranty, fixed it myself.

I opened the the base with a flat head, disconnected the battery (my model did not have a soldered in one) and wiped out the condensation in the housing and on the brush. I put it back together and it works as before. YMMV

Posted on Sep 12, 2013

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  • Beth Fuchs
    Beth Fuchs Oct 17, 2013

    I had the same problem! I followed your instructions and voila it WORKS! Thank you again for posting this! I took it apart with a flat head screwdriver. Saw the condensation and cleaned the inside of the unit up! I AM SO HAPPY since I was past my warranty! YOU ARE THE BEST!

  • Hannah Borgeson
    Hannah Borgeson Dec 15, 2013

    I have the same problem with a three-year-old Sonciare turning on at will and emitting Morse code when on the charger. When I try to unscrew the base, the plastic gets mangled rather than budging. I'm hesitant to keep trying for fear of totally stripping it. Any suggestions for how to get the base to open up?

  • Anonymous Jul 22, 2016

    I had the exact same problem. Long-short-short beep. I thought it was because the green rubber button was eroded and touching the switch below. So I ripped it off. And I cannot buy a replacement rubber... I wish I had read this before, that could have saved me some money.

  • David Kim
    David Kim Jul 08, 2017

    Here is what i found on youtube, how to dissemblehttps://www.youtube.com/watch?v=puHS8SY5...

  • Jerry Lantz Jan 06, 2018

    Could have used some plastic and silicone to cover the exposed button...
    MOISTURE GETS IN AFTER THE SEALS GET TIRED... TIME FOR PRO MAINTENANC...
    CHANGE ALL SEALS AT AUTHORISED DEALER AND REPAIR...
    how ever , brush all the parts with %90 alcohol and let dry , alcohol removes moisture... pour the rest jn the gas tank of your car and watch it run like a race car as the water in your gas tank is removed...!!!!

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Here is how I fixed the problem: I removed the bottom cap of the toothbrush by inserting a large flathead screwdriver in the slot/hole in the bottom and twisted to left until the cap popped out. Make sure your screwdriver is wide enough to fit in the slotted groves or you will strip it. I then slid out the brush assembly and did notice there was moisture and even some corrosion on the board under the ON button. I dried the assembly off the best I could then I used a can of electronics cleaner from RadioShack. This will displace any moisture and clean any corrosion buildup. I sprayed it liberally one component at a time. The buttons, all the chips on the board, the charging coil at the bottom and even the battery contact. It dries very fast. I repeated this a few times. When I sprayed the on button, I repeatedly pressed it on and off to work the cleaner in. I dried out the inside of the plastic case before I slid the assembly back in place. Then then pushed the bottom cap back in until it snapped into place. This was easy and does not require a tool. It is now fixed and no longer starts on its own or pulse while on the charger.

Posted on Jan 13, 2015

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Update to my original solution. Six months after my original fix my brush started to become very difficult to turn on. The main problem with theses brushes is moisture getting inside the brush handle and damaging the electronics. My original solution fixed the issue but did not address the moisture. I took my brush apart once again and cleaned it with electronics cleaner from Radio Shack. I then applied clear dielectric grease (Get at any auto parts store ) to both buttons on the main board that control the settings and on/off function. I pushed the buttons repeatedly and kept reapplying the grease to work it in.This will displace any water and protect the buttons from moisture moving forward and prevent any future corrosion. I then lubed the O-Ring at the bottom. And before I re-assembled the toothbrush I applied a ring of clear silicon over top of the rubber boot at the top of the brush. I then snapped the brush back together and let the silicon dry completely before using. The silicon should help make a better seal keep out the moisture and if any gets in the dielectric grease should protect the buttons. The brush is back to 100% operational and hopefully will not have any more issues for a while.

Posted on Apr 20, 2015

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The switch is worn out and there's no fixing it. Sorry, but you'll have to get a new one (although I think Phillips is counting on that).

Posted on Sep 01, 2017

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Over the last few weeks, my Sonicare Diamond Clean began to turn itself on and off, as described in other posts, like Morse code. Then a couple of weeks later, it would turn itself on and run for many minutes at a time.
I managed to slide the internals of the unit out from the bottom (no tools required), just placing the unit upside down, and firmly pushing down on the housing until the internals pushed out from the bottom of the unit.
Once the internals were separated from the housing, it was clear Sonicare has a design flaw with this brush system, as water must seep down the top seal and into the internals while it sits in the charging base.
My unit was very wet on the inside, with lots of corrosion on the circuit board. I left the unit apart overnight to let all the moisture dry.
Next day, Using about ½ can of CRC QD Electronic Cleaner on all the electronics and battery connections of the unit made a visible improvement to the corrosion problems.
Put the unit back together again, and it appears to be charging and working as normal.
Lesson learned to extend the life of my Sonicare Brush is after each use, remove the brush head, and dry the top post with a towel, to reduce the opportunity for water to seep down into the unit while it in the charging base.
Thanks to all who have previously posted, because without the knowledge, I would have otherwise just gone to Costco and purchased a new one.

Posted on Apr 13, 2017

  • Ben Hayes
    Ben Hayes Sep 01, 2017

    I had a flexcare that kept turning on by itself. Tried to repair and failed due to moisture build up over many years. No electronic cleaner could fix.

    So I invested in new Sonicare and made sure to wrap top seal tightly in self-bonding silicone tape. For good measure I wrapped bottom seal too.

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This is happening to mine, as well. I had to put it in the garage to get some silence. I called Phillips Customer Care and was told it is out of warranty. No help and no suggestions. I bought it from my dentist's office about 3 years ago.
Thanks for the fix suggestions...will try that.
I am very dissatisfied and disappointed with Phillips Customer service and support. Those toothbrush es are very expensive.

Posted on Oct 13, 2016

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: my daughters sonicare toothbrush makes

This happened to me as well. In my case, it meant that one of the metal bars for the brush head broke. If you unscrew the brush from the base and look at it, touch the metal stabilizer bars inside to see if one of them is broken. If so, a simple brush head replacement will fix your problem.

Posted on Jan 09, 2011

  • 86 Answers

SOURCE: I'm trying to find site

Hi jodnerhome,

Here is the link to register your Philips Sonicare:

http://ow.ly/6siPR

Let me know if you have any issues. Hope this helps!

Please rate this solution and comment!

Posted on Sep 12, 2011

  • 86 Answers

SOURCE: On the 28th January 2011

Hi penguin33879,

I work for Philips, and I came across your post while visiting Fixya. I wanted to share with you the link for registering your Philips Sonicare:

http://pnregistration.harte-hanks.com/sonicare_registration.aspx

You can also shop online, search for product information, and find support by visiting www.philips.com.

I hope this helps.

carloffb

Posted on Feb 08, 2011

  • 1 Answer

SOURCE: My child's sonicare toothbrush won't

Mine won't either

Posted on Mar 24, 2011

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