Are you using an ANT+ hr monitor or Polar? If you are using an ANT+ hr, have you downloaded and installed the ANT+ patch?

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I am using the polar one, with a standalone sensor that connects by a serial cable into the yellow control unit.

(I did not know that there was an ANT+ patch. Does it work with this sensor?)

It's just a crappy heart rate monitor. Mine went out a few years after I bought my Computrainer. Has nothing to do with the Polar strap itself, but with the detector that you plug into your controller box. You are far better off buying an Ant+ dongle for your computer and then buying a Ant+ hr strap. But the Ant+ heartrate will only work with programs like Trainerroad, Perpro, or Zwift. Racermate One won't work with the Ant+ devices.

Which strap are you using. IIRC, the CT Polar dongle works best with the older (non user replaceable battery) uncoded Polar straps. I never had a problem with it when using those straps.

They had problems with the newer coded straps, and I believe it required an upgraded "chip" in the handlebar controller to get them to work reliably.

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Same experience here - have 2 old polar straps and can't pair either with the head unit. Using ANT+ Dongle and Garmin hr strap to display HR in Zwift.

 "Racermate One won't work with the Ant+ devices." This is NOT correct- I use my Garmin 1000, ant+ strap and have dongle on extension cord so it about 2-3 ft from chest strap-have to have strap on and functional before you start RM1 and have to have Computrainers update to allow all this but it works flawlessly for me with heart rate showing on RM1 screen along with power cadence etc etc..

No polar is not ant+ compatible. The ANT+ patch is for hr monitors like garmin.

I would look at getting an ANT+ usb dongle to plug into your computer and get an ANT+ hr monitor (garmin). ANT+ WILL work with racermate one.

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Oh, good to hear. I haven't used my Racermate One software for about two years since I started using Zwift and PerfPro.

I've used the wireless polar approach, but I've gone back to the ear clip on a wire. As backwards as it seems I never have to deal with signal drop outs and it just plain works. It gets uncomfortable for longer rides but after a few minutes I don't even notice it anymore. When I used the wireless mode I frequently was fiddling around with the placement of the sensor and all sorts of nonsense.