Hello,
I presently have two mains interlinked smoke alarms with battery back up. U nfortunately one is faulty and keeps sounding. I have tried cleaning it wit h a hoover but no luck. I am interested in whether all mains interlinked sm oke alarms with batteries are the same. Basically, if I bought another two interlinked alarms that were a different make could I simply replace the cu rrent two by copying the connections?