Sense doesn't read heartrate any more and light don't work on the back of the watch.

[MarioDings]

After just 2 years the Sense is going to die, I guess. The little green light on the back of the watch aren't lit anymore. 

So no more heartrate, no more sleep score and bad calories burnt.

I've reset, reboot and factory reset the watch. Nothing seems to work anymore.

[Guy_]

Hi @MarioDings - sorry to hear about the failure but knowing how the watch was used will help discover how it became faulty.

If the battery drain is also more rapid than usual it may have water damage, or it may show other faults.

You will presumably have to get another watch but try this one again once the battery has completely died in a couple of weeks.