CO Sensor...beep,beep,beep at 3AM
The last two nights we've been awakened by the carbon monoxide sensor. It's pretty loud. Thankfully, neighbors haven't said anything. I think I got to it both times before it became too much of a prob...
Forum Discussion
Mine would usually only go off if the battery voltage was starting to get low. Even though you state that you're plugged in, you might want to measure your battery voltage before you start replacing parts. Who knows, it could be a converter problem and the detector is the first item to give you a signal.
