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Resting Heart rate not working

A few nights ago after an activity (a run) my 645M stopped monitoring my resting heart rate. I didn't notice until later the next day when I noted that there was no sleep data from the night before (or subsequently).
Note: it still records my heart rate when I'm doing an activity (running, walking, cycling...)
The stress widget asks me to check my watch fit and there is no 4-hour heart rate recorded. I know the fit is fine, or it wouldn't record during activities.

I've tried switching off and on, syncing through Express and Connect; a soft reset; a hard reset - but still it only records heart rate when I'm doing an activity.

It feels like a software or settings issue, but I can't for the life of me find a setting that only monitors heart rate when in activity.
Any ideas?

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0 Roedema over 5 years ago

It sounds like you may have turned Activity Tracking off. Go to the watch menu (long press UP), scroll (UP/DOWN) to Settings and select it (START). Then scroll to Activity Tracking and select it. Press START to toggle the setting. Although with that off, I get "No heart rate data available" on the screen that your image shows.

0 sandra.steyaert over 5 years ago

I have the same issue... resetting, switching wrist heart rate on/off as well as activity tracking, ... nothing worked so far.

0 Roedema over 5 years ago in reply to sandra.steyaert

Hmm. Try this. In Garmin Connect (Web), click the watch icon in the upper right, then Device Settings for your watch. Click on Activity Tracking, enable it, and Save Settings. (The steps are similar in Garmin Connect Mobile.)

0 5619921 over 5 years ago

Hi,

Just wandering if you found a solution for this problem as mine is doing the same

0 3327302 over 5 years ago in reply to Roedema

Thanks for this information, this worked for me.

0 8037247 over 5 years ago

I also have 645M and I have the same problem and tried those resets as well. I called support and they have no clue either. I bought this only 3 months ago and I am very disappointed. And Anyone has any idea?

0 mikepickard over 5 years ago in reply to 8037247

I had my watch replaced under warranty.

0 Avi Zubia over 5 years ago

Had the same problem, any trouble shoot?

0 6816448 over 4 years ago in reply to Roedema

Thanks! This helped me out. I was worried my heart rate monitor was defective out of the box but this worked.

+1 PhilipAGeorge over 4 years ago

I saw the same behavior, the battery ran out this morning and it would not work, once i charged it. I tried togling the heart rate off/on. Restarting the app, watch etc. none of this worked. The watch soft reset did the trick - pressing and holding the light button for 15 seconds.