Is Home Monitor capable of having a separate alarm for Carbon Monoxide or is everything a Smoke Detector?

SmartApps & Automations
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Working on integrating my smoke detectors and carbon monoxide alarm and it seems like Home Monitor lacks the capability to act on carbon monoxide detection.

I’m using a virtual device which is a smoke detector with CO level in it, but if the CO level is tripped, nothing happens. Only when the smoke detection does it trigger. Unfortunately I don’t see a virtual device that is strictly a CO sensor (I need virtual because of what I’m integrating), but in home monitor, it seems to only look for smoke detectors anyway.

Is that just the way it works?

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Answering my own question… The device has to be defined as a carbon monoxide detector solely, not a combo unit. At least that’s what I found.

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I was wondering why Home Monitor explicitly mentioned both Smoke and CO detectors in the text but only appeared to allow specifying smoke. If it does handle CO but not combined Smoke and CO detectors then that’s quite a nasty bug.

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In fairness, it could somehow be a problem with the virtual device I’m using.

I don’t have an actual combo device to test with though. Would be nice if someone out there could verify…

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I’ve got First Alert Z-Combo smoke/CO detectors in my house. The verbiage in STHM only talks about monitoring for smoke, but that might just be because smoke detectors are more common. If you go into View Sensors, and then the gear icon, it asks, “Select sensors to monitor for smoke and carbon monoxide.”

Also, the IDE shows the device profile as “smoke-co-battery”, and capability/attributes as “smokeDetector/smoke” and “carbonMonoxideDetector/carbonMonoxide”. Based on that, I’m pretty sure it monitors for both separately. I know how to test the smoke detector side, but not sure how to test for CO safely.

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For myself, I’m able to monitor them separately so I’m good.

On my combo unit, the test button does CO and then it does smoke. I’m able to get each because I was able to split out the alert using kidde relays into 2 separate virtual devices. So I have one that is a smoke Detector and one that is a CO detector and those work under STHM. But the combo like you mentioned would not trip for CO.

If I were you, for my own piece of mind I’d figure how to test that combo sensor for carbon Monoxide.

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Fortunately, our landlord left a plug-in CO monitor, and we keep that in the central hallway between the HVAC closet, the kitchen, and our bedroom so I think we’re covered for that. We do test the combos monthly with the push button, and ST reports the results correctly.

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So do the combo units trip the CO portion of STHM? Or only smoke?

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When you push the test button ON A Z-Combo the device tile only says TEST and it doesn’t trip STHM.

You can test the smoke part with canned smoke, but I don’t know of a safe way to actually test the CO part.

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Interesting. On my physical combo units, when I do push the test button on the detector, it trips both the smoke and the fire components. First it does the CO then it does the smoke. Each is individually picked up by STHM