Fenix 8 43mm (os 11.90) keeps loosing connection with HRM-Dual

Cinqniu 7 months ago

My Garmin keeps losing connection with Garmin HRM-Dual when I am not in training activity.

I put on my HR strap on my chest.
I take off my watch.
I check that the sensor is paired and connected -> it is.
HR is visible for a few seconds, then it is gone.
I check that the sensor is paired and connected -> it is not...

It is working okay during activities, but not in that scenario.

Top Replies

Garmin-Laurie 3 months ago in reply to simacekjakub +1 verified

Update February 26, 2025:

Our engineers are aware of an issue that may potentially cause external sensors to fail to Auto connect each time. These are still able to be manually connected again. Sometimes…
Garmin-Laurie 6 months ago +2

Hello Cinqniu

Garmin watches require you to be be recording an activity to use an external HR sensor. So to use the HRM Dual you will need to start an activity recording on the watch.
Adam 1 month ago +1

Mine keeps disconnecting during activity. Works fine on my fenix 6 pro

All Replies

0 Garmin-Laurie 6 months ago

Hello Cinqniu

Garmin watches require you to be be recording an activity to use an external HR sensor. So to use the HRM Dual you will need to start an activity recording on the watch.

0 socnyc 3 months ago in reply to Garmin-Laurie

Well that’s rubbish! A previously paired HRM should be automatically picked up by the Fenix 8 when the HRM is broadcasting and close by. On my Tacx Neo bike I want Zwift to track the activity (which does capture the HRM), It the Fenix 8, but I want an accurate HR tracked for my long term Fenix HR records. The Fenix 8 is terrible for HR/intense workout eg 108bpm max just now vs 160 on HRM. The Fenix history is missing my high HR workouts.

0 socnyc 3 months ago in reply to socnyc

*not the Fenix 8

0 simacekjakub 3 months ago in reply to socnyc

This can be solved by this: Start an activity on Fenix 8 too. After you finish, save Zwift ride, discard Fenix 8 activity.

So you will see Zwift ride in your activities and also recorded correct HR in your Fenix 8. You don't even have to wear them during the ride.

+1 Garmin-Laurie 3 months ago in reply to simacekjakub

Update February 26, 2025:

Our engineers are aware of an issue that may potentially cause external sensors to fail to Auto connect each time. These are still able to be manually connected again. Sometimes this may take more than 1 attempt. This is a software related concern. If you are experiencing this, your watch will not need to be replaced. This will be resolved with a future software release. Once more information is available, I will update here.

0 Adam 1 month ago

Mine keeps disconnecting during activity. Works fine on my fenix 6 pro