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For a couple days, our CO2 detectors in the basement have been going off, intermittently for short periods of time. I had just replaced them last fall and our furnace isn't in use so I checked the hot water heater and it was fine. I was a bit baffled since there is no other possible source. Then, this morning, I woke up a half hour earlier than usual, so I extended my work out. So I happened to be down there long enough for it to happen 2x. 1/2

As a result, I was able to notice that both times it was right after the dehumidifier came on. The litter box, is right next to the dehumidifier and the self clumping litter make a very fine clay dust. Over time that dust built up inside the dehumidifier and when it blew it out, it caused the false alarm. I cleaned the inside of it and moved it away from the litter box. Hasn't gone off since. This is good, the noise was putting me over the edge and it didn't cost me any $.

Rose

@Phil Glad you found the problem. We don't even have gas, but CO2 still registers on a meter that was bought. Once the windows are opened, it goes away. So...I don't know. You have to be a detective these days.