Apple Watch - Green lights
What does it mean when there are green lights illuminating on the back of my Apple Watch ?
Question marked as
Best reply
Those are heart rate sensors which should not be activated when the Apple Watch is not being worn. Please refer to the "Apple Recommended" answer in this ASC Forum thread: 2 green lights on back of Apple Watch 4 - Apple Community which states that restarting your watch may be helpful. You may also have a third party app which is interfering with the watchOS.