Bringing this thread back to life again, as I've searched and have not had any luck. My system has been working for years with three Prestige IAQ units and a Vision Pro. I wanted to add a remote indoor sensor to the zone with the Vision Pro, so I swapped the Vision Pro for a new Prestige IAQ unit. I noticed that the new unit has 4.0 firmware.
The problem: there is no longer an "Add Wireless Device" button! The other sensor options are there (view devices, remove device, rename device), although the Help screen on that page still clearly calls out that "Add Wireless Device" is a feature.
I called Honeywell and after a long time on hold waiting for the tech support person to talk with someone else, the response I got is that that feature is no longer supported on the thermostat for zoned systems and that I need to call a technician to add the sensor to the zone panel. This doesn't make any sense to me, as the programming interface for this system is the thermostat.
Has anyone else run into this issue? Am I doing something wrong?