I’ve got a Wattbike with the older “Model A” performance monitor. I’ve been trying to pair it with a HR sensor but the bike doesn’t detect anything.

The Model A supports Ant+ for HR. I’ve tried the Garmin HR-Dual and broadcasting HR from my Garmin 935 and neither are detected.

Is there a list of compatible HR sensors for the Model A? Do I need to get hold of an older HR sensor?