New battery, then wet the contacts, put it on, and have it search again.

Yep- Did all that stuff (actually multiple times) Heart rate mode is in Auto. Thanks

Did you wait long enough for the heart rate monitor module to fully discharge? If the chest strap and module are Garmin, they suggest you wait at least 30 seconds, or place a coin across the contacts to allow it to fully discharge before putting the new battery in. I've personally never seen this work. In any case where replacing the battery didn't immediately work, I have never gotten that one to work correctly again. I have since ditched the Garmin straps in favor of a Wahoo TICKR.

If it still doesn't find it after doing all that (and having it search for sensors using the menus), 99.9% chance it's dead. I've had at least half a dozen fail, and footpods.

Another thing to try is to put the battery in the wrong way and keep it there for a few seconds. Then put the battery in properly and try again. That has worked in the past for me.

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Ill try some of the suggestions. Thanks. It's annoying because I never had issues with my old 920. It is like the 935 doesn't "see" any of the Garmin chest straps sensors. I tried three. I'll try a different brand of heart strap this afternoon and see if that helps.

If you say your watch is in auto mode, I believe it will automatically use the wrist sensor. Have you actually told the watch to look for a HR strap? Go into the Settings>Sensors&Accessories>Add new>External Heart rate--this tells the watch to look for the signal...Make sure you have had the HR strap on a bit and the sensors are moist and close fitting to the skin before searching for the signal...

Ill have to switch modes tonite. Hopefully that is the issue. I thought in auto mode it will use either but default to the chest strap...but it doesn't work so i must be wrong. I have told it to look for new devices and even specifically "chest strap" (similar to bluetooth pairings) but no dice.

Sounds like you did everything right. Maybe the strap is fried?

Do you have another device to try? Bike comp, trainer road, etc?

You have to pair a sensor before the 935 will recognize it. It's the same procedure you'll use if you want the watch to pickup a powermeter, cadence/speed sensor etc. Without pairing it will never 'see' the HR strap even in Auto mode.

I just had this issue and called Garmin. They sent me a replacement chest strap.

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2018 Races: IM Santa Rosa, Vineman Monte Rio, Lake Tahoe 70.3