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The S120 is now a fairly old watch. When the function buttons and heart rate cease to function this is generally an indicator that the battery needs to be replaced. The buttons themselves can also become worn out or weak of function, in either case you have a couple of options.
1) send in to a Polar Authorized Service center: This is very important, do not take to a normal watch shop. You need the watch properly resealed and handled correctly as well as you may need parts such as a button return spring they will not have. Plus there is a 90day warranty on Polar's repair. You will also need to send in your chest strap just to make sure that is still functioning properly. Battery repair about $15-, new buttons another $10ish, and a chest strap if needs replacing about $25 or $30-. $50-$60 total if everything needs work, but this is just an estimate.
2) buy a new watch unit. The RS100 (the current replacement) is about $100- and is easier to use with a better chest strap.
This is a common issue. The Polars and other Heart Rate monitors are not designed to be fixed by the consumers except for very specific models. These only look like watches, they are in fact mini computers and very susceptible to internal damage if not handled properly.
You need to send the unit it to a Polar Authorized Service Center to have fixed properly. There is not reset within the computer, if you had done everything correctly then it would work.
This is really easy to do yourself. Get a CR1632 battery, unscrew the four screws on the back (dont tip the watch as there is a small spring in the watch), unclip the metal band holding in the old battery noting the way 'round the battery is in (minus side up), pop in new battery and push clip back down, when re-fitting the back make sure the spring mentioned earlier lines up with the white sticker with a hole in it on the inside of the watch back, screw down the back. After you have re done all your settings you may need to re-aquaint the watch with the strap, to do this put on the watch and strap, set the heart monitoring going, bring the watch up close to the 'Polar' logo on the chest strap until the time is displayed, should now be all set up.
The case back has to go on the right way 'round. There is a white bit on the inside of the case back with a hole in it, this hole has to line up with a spring which is poking upwards out of the watch mechanism, i think the white thing is the aerial to the chest strap.
you need CR2032 lithium batteries. They can be found on amazon (pretty cheap). here Finally charging for our multi device world
click on the link and chose some (by price or vendor...) I hope this was helpful. cheers
Check that the case back is on the right way. A spring sticking out of the watch mech needs to line up with a hole in the white sticker on the inside of the case back, I think this is the receiver aerial.
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