Hey hey @jacki29, welcome to the Fitbit forums! If you are getting this "--" on the tracker itself instead of your BPM, let me explain to you that occasionally the tracker can have difficulty finding a signal, typically due to the tracker's fit. For example, wearing your band tightly may constrict blood flow in your wrist and affect the signal. We also recommend experimenting with how high you place the tracker on your wrist. When you're not exercising, wearing the tracker just above the wrist bone--as you would a watch--typically works fine. However, moving the tracker up a couple inches can be helpful during high-intensity exercises or exercises that cause you to bend your wrist frequently. If you haven't already done so, please review our recommendations for wear and other tips at this post.
By default your tracker's heart rate setting is "Auto," which means the heart rate sensors are on when the tracker is on your wrist. To verify you didn't accidentally turn the sensors off, go to your Fitbit account, on the heart rate settings, then don't forget to sync your Charge 2 to save the changes.
If you're wearing the tracker correctly and the heart rate setting isn't turned off, try changing the setting (either Auto to On or On to Auto) and then sync your tracker. The change won't take affect until you sync. If heart rate still doesn't appear after the sync, try restarting your tracker. You can find restart instructions at this other post.
Give it a shot and let me know how it goes!
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