Replacing the Battery for the Heart Rate Monitor
If you cannot measure your heart rate, the heart rate monitor battery may have run out. Replace the battery.
The heart rate monitor uses a lithium battery (CR2032).
Use something flat, such as a coin, to remove the battery cover.
You can avoid damaging the cover by wrapping the coin in a thin handkerchief and so on.
Remove the battery, and reset the heart rate monitor.
First, remove the battery.
Turn the battery over so that the negative side is facing up and put it back in, and then wait for at least three
Resetting the heart rate monitor:
Any remaining charge in the HR sensor circuitry is dispersed by removing the battery, reinserting it with the negative
side facing up, and waiting for at least three seconds.
If the heart rate monitor temporarily freezes, you can reset it by using this method.
Insert a new battery.
Make sure the + side is facing up.
Measuring Heart Rate (Heart Rate Monitor)