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Reading heartrate outside of an activity is inaccurate?

I noticed this quite a few times, when I am on Zwift and wearing my 255 the HR reading doesn't match at all.

I'm on Zwift using a Polar Verity Sense (strap).

The 255 is just on my wrist but there is no activity being recorded. You can see that the data just doesn't match at all, and this is not the only time.

I have recorded a short video here as you can see here.

https://youtube.com/shorts/IoVvgf5ACMw

0 9311008 over 1 year ago

I noticed this on mine as well. When I'm out cycling, I use heart rate strap paired with Edge 530. I've noticed when I'm on low effort say 120-130 bpm both are minimally accurate, but when I go all out above 140 to 180 watch keeps on 130. Idk if ifs the road irregularities or just HR malfuction

0 global_local over 1 year ago in reply to 9311008

9311008 said:
road irregularities or just HR malfuction

Definitely a second one. I compare my 255 to my 5 yo VA3 on a right hand and 2 generations older VA3 OHRS is spot on. This is very frustrating to me.

0 Lewis over 1 year ago

I see that rebooting the watch can help after an update with this issues, so push for a few seconds the "light" button until it restarts and give a try, mine is working fine with 18.23 i saw sometimes a spike from 100 to 154 in the gym, but running is very stable an accurate