I have the 235 with the latest firmware 8.0.0.0. During an outdoor run on the 23 February I noticed an issue with the heart rate monitor freezing during activity, I had not experienced this two days earlier during a 5x5 min exercise. It got stuck at a heart rate of 186, which is around 10 bpms away from my max for almost one hour.
Mine tends to slip down towards my wrist when I'm especially sweaty, which of course causes trouble with the heart rate reading. Tighter doesn't help, as I'm trying to wear it above the narrowest part of my forearm. I've considered putting a thumbtack in my arm, but instead just push it back up and ignore the oddities in the recording.-- Pete
A dedicated community for Garmin users to ask questions, provide answers, and share feedback. Forerunner 230/235 Heart Rate monitor going crazy/not working since A dedicated community for Garmin users to ask questions, provide answers, and share feedback. Forerunner 230/235 Slow deteriation/cracking of Heart Rate Monitor A dedicated community for Garmin users to ask questions, provide answers, and share feedback. Forerunner 230/235 Heart rate monitor works in activity tracker mode Turning Off the Wrist Heart Rate Monitor. The default setting for the Forerunner® 235 is Auto. The device uses wrist-based heart rate automatically unless there is an accessory heart rate monitor connected to the device. Select Menu > Settings > Heart Rate Monitor > Off.
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