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Forerunner 735xt stopped pairing with chest straps

I have a three year old Forerunner 735xt. For some unknown reason it just stopped pairing with my chest straps. I have three (HRM-Run, HRM-Swim, and brand new HRM-Pro which has yet to be paired). I searched this forum and as a result tried removing the prior pairings for the Run and Swim and restarting the watch. I also put a new battery in the HRM-Swim. None have solved the problem. When I try to pair with "Search All, it says no sensors found. When I try to pair as a HRM, it tells me to wear the HRM to connect, yet I am wearing it. I've tried this with all three straps. I find it unlikely that all three would be bad so there seems to be a watch problem. Any suggestions on what else to try?

0 HOSGOODA over 1 year ago

Charlie. I am having exactly the same problem. Also, RHR has not been recorded for a while now. The different straps I have tried also failed on my 530 bike computer.

0 Charlie over 1 year ago in reply to HOSGOODA

Hosgooda,

I’ve resolved my problem and it turned out to be bad HRM batteries. But circumstances were such that it didn’t seem like it could a battery issue. I ended up doing a chat session with a Garmin service rep. She focused on the brand new HRM-Pro since one would expect that to be in perfect working order and it has the ability to connect two ways (Ant+, Bluetooth). She had me try to connect to Garmin Connect via my phone using Bluetooth as a way to check if there was a watch problem. That connection failed too. From that she concluded it was either a dead battery (something I didn’t expect from a new strap) or a bad HRM strap. I removed the battery and checked it with a volt meter. It was dead. After replacing the battery, it was able to pair. I then went and checked the battery on the HRM-Swim, which I had already replaced with what I thought was a new one, it too was dead. I’m not sure how I ended up with a dead battery since I replaced it with a new one from a package but perhaps I got the new & old mixed up. Afte replacing it again, I was able to pair it. I then checked the HRM-Run, also a dead battery. So, what seemed improbable to me turned out to be reality. If you haven’t done so, I recommend checking batteries with a volt meter to rule out that as an issue. Good luck.