I have a brand new 255s music, it isn't picking up any HR. I have it turned on to auto, I have turned off my garmin, tried reloading, still no HR, didn't pick up any sleep or body battery as well.
I'm sorry to read about this! Please try the following:
Exactly the same problem for me. Since an update yesterday called: "FR255 Secure Config File" via Garmin Connect. I have carried out the procedure described above, no green lights on the internal heart rate sensor. The 265 forum already has the problem (forums.garmin.com/.../the-heart-rate-led-is-dead). It works externally via Tickr or Forerunner 645.
It's annoying that I'm also affected by the other problem (forums.garmin.com/.../heart-rate-accuracy) and now this. :(
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I'm sorry to hear that, Deesche.
All, if anyone is experiencing this and my troubleshooting steps do not work, you will need to contact your local Garmin Product Support center directly. Thank you!