I bought my place about a year ago and haven't had any problems with my smoke alarms save one chirping (replacing the battery fixed that) until last night. Last night my smoke alarms went off as if I had pressed the test button (only lasted for a few seconds). Today shortly after I got home from work it went off again, which makes it at least twice within a 24 hour period. I went around and tested them all and they worked, but for some reason at least one of them is going off by itself.
The 6 smoke alarms (BRK Electronics Model # 86RAC) are hardwired together and are powered by 120V and/or battery (currently both). When they go off all of them go off at once which makes it impossible to figure out which one is going off. Assuming the smoke alarms haven't been replaced since the house was built that would make them around 12 years old.
Is there anything I can do to figure out which one(s) is causing the problem? I suppose I could disconnect them all from the power and see if one goes off eventually and hope I hear it, but is there a better way?
I'm assuming they can be replaced. They have 3 wires labeled white, black and interconnect.