Garmin have issued a detailed service advisory here (link to:garmin.com). If you do not feel comfortable doing it yourself then you can send them off to be serviced by Garmin.
You should also receive a CODE for a free set of UPGRADED battery door covers. If that isn’t enough there is also a firmware v3.50 fix as well.
This will hopefully be a definitive fix for the pretty Vector 3 that was released in February.
What was the problem
Many Vector 3 users reported problems: link to forums on Garmin.com
The design of the door was flawed so then when in use in certain environmental condition, or just simply after a period of normal wear and tear, essentially a short-circuit occurred which rendered the pedals useless in many cases.
It was somewhat surprising that many of the reviewers and testers of the Vector 3 did not pick up this flaw.
What Now
If you are already a Vector 3 owner you have a range of options, I don’t know if your dealer includes returning the items as one of those options. You should DEFINITELY and PROMPTLY fix your pedals either yourself or via the dealer.
Thinking of buying Vector 3?
You might want to hold fire for a month or so until things settle down and we get in all the real-world tests of these new battery door covers.
Here is a detailed look at your PEDAL power meter options if you need something NOW.
Best Power Meter Pedals | Compare Garmin Vector & Rally to Favero Assioma
And here is a detailed look at your general power meter options
Best Power Meter 2024 Cycling Recommendation 🥇 Top 10 Review | Comparison