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I would think it is the sensor circuit in the watch. When you replaced the battery did you activate the processor all reset for the watch? I do not know on your model where or how this would be activated.
Electronic watches normally have a reset procedure for when the battery is changed. Very important the watch's processor reset is performed after changing the battery. This is not any of the user readings reset. This is a reset for the watch's processor and system. It is sometimes a contact that has to be shorted out with the jeweler's screwdriver, or it is a contact that has to be shunted, or etc., depending on the model. Maybe if you call the support for the watch they will tell you this. Normally they do not like the user opening the watch.
navigate using mode button to enter into watch's menu tree for settings/ sport/ run/ heart rate and turn on the heart rate monitor to hopefully detect and scan for the garmin ant+ protocol heart rate strap!
You probably will have to send it away to get sorted (make sure you send it insured and very well protected).
You should contact cerruti to see who the repair shop is in the UK, (not sure they have one.)
Failing that you may be able to buy a replacement strap of ebay and have a general watch shop change strap for you.
Or find a jewellers that sell straps, they should have one that fits.
1) hard rubber/ solid - These can not have the battery changed.
2) soft strap with connector in middle - these you can change the battery.
If you have the soft strap, it will have a small hard around 3 inch long block that "snaps" onto the strap to connect it. These have a battery compartment. Turn it around and you will see the outline for the battery compartment. These are not always easy to open, and the batteries are a little harder to find. Take it into any watch repair and they should be able to pop a new battery in for you pretty easy.
There is a link on my tips and tricks page to get manuals for Polar products, the T-31 wearlink is the product we are talking about, it has the how to change the battery and battery type.
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 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.
Nike Triax CV10 - Successful HRM reset 7 November
2008 I had real problems too. Even after repeatedly
following the known reset steps everyone else is posting up. Here’s how I got
mine going, please forgive the mind bogglingly tedious detail… First make sure you’re using new good quality
batteries. I used Maxell’s, bought in 10’s from Hong Kong on ebay – no problem. Second, and this is the ESSENTIAL bit…move right away
from the computer and any other electromagnetic sources before carrying out the
known reset… Third, follow the known reset steps below, adjusted to
what worked for me… If you press all four buttons of your Nike HRM it
will reset. Next time you go to "RUN" mode, it will show "HRM
LINK" error. You will now need to "hard reset" the unit. Nike made a late change to add a "hard
reset" to the chest strap. To re-link (re-initialise) the watch you'll
need to open the battery door on the chest strap, and use a paper clip (or the
equivalent) to push the small gold button in the battery area. There should be
a small sticker in the battery compartment that points to the reset button. The re-initialisation steps for the Nike C10 and
CV10 digital HRM's is: (1) reset the watch (2) open the battery door on the chest strap (3) move the watch to RUN mode (4) press the reset button in the chest strap
battery area without removing the battery Tip - I agree with the suggestion to use a pin or
needle and definitely do it with the battery in the hrm. Tip – Thumb holds battery to stop it from pinging
out, other hand performs jiggle with pin until the link is made (it links
straightaway if you jiggle it just right!) (5) replace chest strap battery cover…and smile!
If you can't link the hrm do as detailed in the following link
If you press all four buttons of your Nike HRM it will reset. Next time you go to "RUN" mode, it will show "HRM LINK" error. You will now need to "hard reset" the unit.
Nike made a late change to add a "hard reset" to the chest strap. To re-link (re-initialise) the watch you'll need to open the battery door on the chest strap, and use a paper clip (or the equivalent) to push the small gold button in the battery area. There should be a small sticker in the battery compartment that points to the reset button.
The re-initialisation steps for the Nike C10 and CV10 digital HRM's is:
(1) reset the watch
(2) open the battery door on the chest strap
(3) move the watch to RUN mode
(4) press the reset button in the chest strap battery area
(5) put the battery back in the chest strap (if it's not already in - it's possible to push the button without removing the battery)
(6) hold both of the electrode to create a signal (probably not necessary - it usually links immediately).
My suggestion is to use a very thin needle and do it with the battery in the hrm.
Eventually, Nike will either eliminate the hard reset or update the manual to include this info.