Problem with First Alert Z-COMBO CO2 detector not reporting

Devices & Integrations
1

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?

2

I have noticed the same thing, but don’t know why it happens.

My detectors from 2017 and 2019 both show smoke and CO on the detector and in the ST App when tested.

My detectors made in late 2021 and early 2022 both show smoke and CO on the detector, but only show smoke in the ST app when tested.

I don’t have a CO test gas for a real test.

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