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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Ok, thanks for that dump - yes, that does look wrong to me.
Normally the heart rate monitor takes a few seconds (maybe 20?) to adjust itself and start getting correct readings, but it definitely looks like in your case it's not managing to do that.
Where do you live? What I usually say when there's some problem like this is if you could take the straps off the watch (instructions here) and then just post it back to us, untracked, in a Jiffy bag (shipping is cheap that way), I'll get a new watch body in the post to you.