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No idea why yours went off for no apparent reason, but one of mine went off a year or so ago after my wife left a bucket of hot wood stove ashes sit on the hearth instead of taking it outside. It turned off after we took the ashes outside and aired out the house. I'd say it worked.
John
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Far from an expert on these things, but my understanding is for the sensors it's a quantity/time equation. A low concentration for a long period of time will trigger them, a high concentration for a short period of time will trigger them. So it seems reasonable that a small concentration would trigger them after the carbon monoxide danger has potentially already passed, the sensor is just picking up the build up. I personally hedged my bets and installed many, 2 at the potential source (basement) and one on every floor. I also chose not to install all in one units (smoke and Carbon) that way I can replace the monoxide detectors more frequently as recommended.
Love recognizes no barriers. It jumps hurdles, leaps fences, penetrates walls to arrive at its destination full of hope. Maya Angelou
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A friend called this am, all his detectors were going off.....turns out the furnace has a cracked heat exchanger.
Ed
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Well while on the subject what are some of the more reliable ones on the market. Either hard wired, electric, or battery operated.
John T.