I have read all of the threads for when the green light and/or heart rate from the watch is not functioning trying everything suggested: Restart the watch. Clean the back. Tighten the strap. Make sure software is up-to-date. I have done all of these!! yoi37. Download PDF Print Page Share Link Tips for Erratic Heart Rate Data If the heart rate data is erratic or does not appear, you can try these tips. Clean and dry your arm before putting on the device. Avoid wearing sunscreen, lotion, and insect repellent under the device. Avoid scratching the heart rate sensor on the back of the device. Just got a fenix 5s from cex and it seems to not be tracling heart rate correctly. Not in terms of accuracy, whenever it does tell me it seems relatively accurate, but it rarely does tell me. On my watch face, the 2 metrics that are not working are my heart rate and oxygen saturation. They just read with a double dash -- without the actual Press and hold the "Light" button for at least 25 seconds. The watch will probably switch off before the 25 seconds. I keep holding the button. Then press and hold…. Same problem for me. Garmin F5 sapphire. I often have days of missing HR data. Other things sync in GC but hr is first to get dropped. I often have red exclamation next to watch Virtual race predictor is a new feature on the Fenix 7. On the sensor front, there are heart rate monitors and Garmin's Pulse OX sensors across the board, though the Fenix 7 series includes Garmin Yes, was frustrated with false advertising by manufacturers ans sales ("accurate to 2 heart beats" - in reality it is accurate to 30-40 beats which makes it useless). I did more manual HR testing during low activity times when I expected my HR to be around 60 and Garmin would occasionally show 80 or even 90, and every time actual rate was As pointed out, Garmin supports three ways of heart rate: percentages of a max, percentages of a reserve (max minus resting), and precentages where 100% is at the zone4/5 transition. You can divide the percentage boundaries up any way you would like, but you can only do it using those three methods.

garmin fenix heart rate not working