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If Heart Rate is being displayed on the equipment in the gym, but not your watch, then your chest strap is transmitting fine, but the watch is not recieving the signal.
It is not uncommon that when a battery is changed outside of a polar authorized service center that something can happen to the internal electronics. I would suggest you send the watch into Polar and have them take a look. if you have had the watch less than 2 years they will most likely take it under warranty and correct the issue, at the very least they have equipment to test and diagnose both the watch and strap, although it sounds like your HR strap is fine since you are getting HR on the machines.
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.
mcdevito75 here, Battery change is once every year or so, even if you changed thr battery now, you"d forget next year, I know I did. BEST BET, look for a small watch repair shop in your area for the peace of mind. Approx. cost, $10.00-- $15.00
You can change the battery in your polar f7 if the battery is worn out.
1. Insert the tip of a pen knife into the lifting point and lifting the back up. The back of the watch is only pressed into place and will come off easily this way.
2. Grab the small clip that is extending across the surface of the battery with a pair of tweezers. Slide the tweezers toward the end that hooks down into the watch. Pull the hook end of the clip out of the watch and remove the clip from the battery
3. Match the old battery with a new one at any electronic store. The store will be able to read the writing imprinted on the battery to make sure that you get the correct battery type for your heart monitor.
4. Press the new battery into the watch making sure that the writing on the battery is facing up.
5. Press the holding clip back into place. Handle the clip with tweezers only, since it is very thin and can be bent or lost easily. Once it is in place, press the back of the watch on.
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.