Electronics Repair Questions? Ask an Electronics Technician
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If your Garmin Vivoactive watch and heart monitor is not working properly, and if it is only three weeks or so old since the date you purchased it, then it is probably defective within warranty, and as such eligible for Garmin's warranty repair service.
That may be engaged at
by clicking on the link to
file a claim
on that page in the 'Warranty' section.