Our CO alarm by the boiler went off last month. Never has before. It just a bleeper, no display. We don't have any CO2 alarms, they'd be going off permanently.
Not having any idea what to do, I opened the back door and Googled. That told me that you don't get false alarms, take it seriously, call the fire brigade, army and a brass band immediately.
I have two other CO alarms in other rooms that do have ppm displays. I put them both by the boiler.
The original hasn't sounded again, and the others have never shown anything other than 0ppm CO there.
I'm assuming it was a blip, or actually a false alarm. If it was a blip it's not repeated.
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