I have three of the First Alert Z-Combo sensors (combo smoke and CO2 detectors).
Two are working fine. When I test them every month, they report separately for the smoke and CO2 sensors.
But the third one only reports the smoke detector… I’ve tried resetting it. And then removing and re-paring it with my hub. No change. The beep pattern is the same as the other two, but ST doesn’t report anything about the CO2 sensor (other than it’s there).
It’s also the newest of the three with a manufacturing date in mid 2022.
Anyone know what’s up with this?