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Forerunner 970 not recording hearth rate during run

zonfry

As of today my forerunner 970 is not displaying nor recording hearth rate during runs. The sensor works fine during normal operation, but when I start a run nothing 

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    Open the Run activity profile, enter the menu (long-press the left middle button), and check the option Power Mode. If there is any power mode selected, either remove it, or edit the respective power mode, and make sure it does not disable the heart rate sensor.