HRM-Pro Plus bluetooth and Garmin Connect cannot sync

I have had my heart rate monitor strap for 1 month. I sometimes wear the HRM-Pro Plus (version 8.80) without the watch (e.g. when the watch is charging) and I want to synchronise the data via the Garmin Connect app. The phone recognises the strap via BT, Garmin Connect does too. The problem arises when I need to synchronise the data. Garmin Connect says connected and starts syncing data, then 5-10 seconds later it says Not Connected. Sometimes the sync doesn't even happen. It just says Connected, and then a few seconds later Not Connected. And so on and on, trying to synchronise for e.g. half an hour, but failing. The last time I managed to sync was 14 days ago. If I use the strap via ANT and the watch, then I have no problems. I have already removed the HR belt from Garmin Connect, reconnected the belt to the phone and nothing has helped. Does anyone have any idea what could be wrong?

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0 7500626 over 1 year ago

My friend currently has exactly same problem with his HRM-Pro Plus belt. :(

0 BernieV1977 over 1 year ago

I'm having also this problem..

0 2504492 over 1 year ago

Same problem here. Sync is broken between my HRM-Pro Plus and Garmin Connect.

0 Grumpy from dawn till dusk over 1 year ago

I had something quite similar some time ago, documented here:

https://forums.garmin.com/sports-fitness/running-multisport/f/accessories-sensors/319460/hrm-pro-bluetooth-connection-to-smartphone-unstable-since-few-weeks

In the end, it was the battery being low and a change solved the problem:

„In Garmin Connect App and on my FR 255 the battery for HRM Pro was shown as „OK“.
But during yesterdays run, an alert came up „Battery of HRM low“.

I changed the battery today, also doing the „reverse polarity for 30 sec“ trick.

Connected the HRM Pro freshly via Bluetooth to Garmin Connect App and now the Bluetooth Connection is stable again.“

0 7500626 over 1 year ago in reply to Grumpy from dawn till dusk

Thanks, in our case battery was ok, but belt needs to be reseted by pulling battery out and waiting some time. After that sync works ok.

0 libreus over 1 year ago

So many issues with the top tier HRM-PRO Plus with synchronization. Any solutions yet? My battery is full, but it shows last sync with the Connect App from one month ago -> this way I don't get the intensity minutes recorded on the virtual ride on my trainer.

0 Christian_Bergen over 1 year ago in reply to libreus

I had some trouble with my Hrm-pro for a period. The first I did was change the battery. But that didn't help. Then i read that taking out the battery for some time to 'reset' the belt. Unpaird from GC and GF6x, turned off the GF6x. Then added to GF6x and GC. Then intensty minutes were registered when I use the Hrm-pro with Edge 1030. And the belt sync ok with GC without GF6x in range.

0 zajcek2 over 1 year ago

My report. After 3 months, I can suddenly synchronise data from my belt at any time. My theory is that something was wrong with the Garmin Connect app. The current working version of Garmin Connect is 4.65.1.

0 libreus over 1 year ago in reply to zajcek2

Thanks for the info. In iOS is still only available 4.65 (without .1). I hope it comes soon.

0 6242381 over 1 year ago

I've the same issue. It's still there even with version 4.66 for iOS

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