Can't get my Speed Sensor to Pair with Edge 830

Is the sensor awake when you're trying to pair it?

As it turns out my sensor battery had died.  I should have checked this first, however I had just got back from a ride using my old Garmin Edge 800 and I assumed the speed sensor was working.

Are the 800 speed and cadence sensors compatible with the 830. I lost my old 800 so bought the 830 unit only. I'm asking if the 800 sensors will still work with the new 830

What is the model of your sensor?

My older Edge 800 speed/cadence sensors (gsc10) works fine with my new Edge 830. 

My 10 year old GSC10 and Garmin HR strap are still working great.  We also have a 10 year old Bontrager Duotrap sensor that works fine.  Of course we also have the newer sensors and HR monitors but the old ones just keep going.  

Thx guys,  it was the battery I put I it. I must've taken a better from a taillight and stahed it away but forgot. I put it in thinks it was new..  Got new batteries and all is well.

Safe on the road and "rubber side down." That's a diy bike bleeding before you ride or race.