RichB. Are the green lights flashing on the bottom of the watch?
Didn't work. No green lights still
Has anyone solved this as I'm struggling with the same. It was working earlier but after I woke up from a nap while my watch was charging, the sensor didn't work. I tried resetting and also factory resetting..
This happened to me today - the Wrist HR got turned off. Had to enable it in watch settings, see the second item in this link.