It has been a while since there were any posts on this topic. We have responded to 5 false alarms in one neighbourhood recently. We are going to work with our building department to address the root cause, however, I was hoping to check in and see if anybody has additional advice regarding the potential cause of the nuisance activations/faulty units? Seemingly, improper start up of the unit and / or accumulations of dust and dirt during the building process can both cause these problems. Any tips as to how you have addressed them would be appreciated.