Polar F11 and Electro Magnetic Interference

Last Sunday, right before I was about to start my PG&E run @ Rancho San Antonio I started the monitor on my Polar F11 wrist watch. But instead of starting the counter in a normal way, it just started emitting a shrieking sound. And it will NOT stop. If you are familiar with Polar F11, it has 5 visible controls. I tried pressing all of them in all possible combinations and it will not go away. It was audible to the level of disturbing during the run, to me and to others. Since I was not able to deal with the sound in any apparent manner and wanted to get done with my run sooner, I decided to drop the monitor in the car and started running without it.

All along the run, I had no clue about my timing. I used it to my advantage and instead took a detour through Upper Wildcat Canyon trail which is very beautiful and much more shaded. After I reached my car back I realized that the noise level has not reduced at all. I checked the manual for the symptoms after reaching home but it does not mention a clue about it. I took it to a nearby REI store and they had no clue either. They told me to contact to REI customer support and hide the clock away until then. This anyway was my last resort as well.

So the watch was hidden in the garage they whole Sunday to keep the noise level low. Luckily, Polar customer service opens up at 5:45am PT. I called them before Monday morning run and they told me to hold all the visible buttons together for 10 seconds. And voila, that reset the watch and the sound went away!

The customer service rep suspected it might have been caused by the electro-magnetic interference. I've used this watch multiple times on the exact same route but something was different that day :)

Anyway, I learned something new about Polar F11 - how to reset it!

Technorati: polar heartratemonitor


I've had t reset my F11 many times. Sometimes shrieking as above, sometimes just unresponsive to normal button presses (dispaly locked on something strange). I've still no idea what causes this but the reset trick seems to work and even though you have to reset the date/time etc. other values seem to be retained! The important thing is that the reset operation requires you to press all the buttons on the F11 EXCEPT the light button.

Posted by Eoin on July 04, 2007 at 08:52 PM PDT #

Thank you very much!!!

Posted by Dmitry on July 12, 2007 at 03:25 AM PDT #

thanks for sharing!!!! I just reset my watch...
love blogs, denisse

Posted by denisse on February 10, 2008 at 06:56 AM PST #

You saved my time without my Polar....mine locked up and I couldn't find the owners manual. I was set to mail it back (I am in Europe) when I thought "I should google this" and voila! I found your blog and it worked. Thanks so much. I was feeling lost without it.

Posted by Jane Acosta on July 29, 2008 at 03:05 PM PDT #

Does anyone know how to get the battery out of the chest monitor? I can unscrew the back piece (large plastic piece -- not 4 mini screws), but the back does not pop off as expected. Polar tech said on phone it sounded coroded from pool chlorine. Any ideas?


Posted by Sarah on August 22, 2008 at 04:12 AM PDT #

You can remove the strap battery by turning the battery cover counter clockwise about 1/8 turn and then whack it on the edge of a desk so that the outer peremiter of the large pastic piece hits the desk edge and the round battery cover does not. Then the round cover will be knocked out, probably with the battery. It took a lot of experimentation to learn this, but it works everytime.

Posted by jay on September 28, 2008 at 12:11 PM PDT #


How do you go about resetting the watch?
I have purchased a second hand F11 and I need to enter my basic settings, such as weight, but I cannot find anything in the manual with this information. There is a section on entering these details, when the watch is first switched on but I cannot find anything about changing settings, already stored.

Thanks for any help.


Posted by Jenni on November 06, 2008 at 04:40 AM PST #

Jenni, Hold all the four buttons together for 10 seconds to reset F11.

Posted by Arun Gupta on November 07, 2008 at 09:08 AM PST #

Any suggestions to do with an F11 that shows the time, and other settings (so it can't be the battery...right?), but doesn't want to pick up my heart rate? I've wet the sensors plenty, and I've reset it as well, but it still won't show a heart rate.

Posted by NWT on November 25, 2008 at 08:07 AM PST #

NWT, I faced that problem couple of times but I was not placing the sensor correctly on my chest.

Posted by Arun Gupta on December 05, 2008 at 09:45 AM PST #

J've just replace the 2032 battery of my F11...but...no more.It's seems dead...Probably i have to reset it, but not by 3 botton press...Can enyone help me, please? Thanks.

Posted by Giuseppe on September 26, 2009 at 04:31 AM PDT #

I am having the same problems with my F11 as Giuseppe. I have replaced the old with two new batteries to no avail. The watch is dead. Any suggestions? Thanks.

Posted by George on November 11, 2009 at 06:54 AM PST #

That's a very cool watch, I want one. Thanks for the article!

Posted by Ryan on January 20, 2012 at 11:58 PM PST #

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Arun Gupta is a technology enthusiast, a passionate runner, author, and a community guy who works for Oracle Corp.

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