Hi, My house has hard-wired 120v smoke detectors. One went off today for a few seconds. So I climbed up to take a look, and I noticed on the plastic housing it says replace by year 2005. I tried the test button and it worked, I actually tried the test button on all the detectors and they all worked. Should I replace all the detectors? They seem to be working, based on the test button. I know there are recommendations on replacing battery operated ones but not hard-wired ones.
Thanks, Jeff