Heart rate too low is displayed

MaralynManson

Since the 4.0 update my exercise now registers but I have an 'error' message displayed on the watch. 'Heart rate too low' I haven't set any perameters and there doesn't appear to be any set up. It seems to be telling me it cannot read my heart rate?

I am on an exercise bike with a heart rate of 120 on the bike and the error message appears.

Anyone have this or any ideas why it's occurring?