Why do home security systems have false alarms?

Home security systems often have false alarms because of pets, poor sensor placement, low batteries, open doors or windows, weak camera zones, user error, or DIY setup mistakes. The system may detect movement or a zone change correctly, but the event may not be a real intrusion. Professional installation helps reduce false alarms by placing sensors correctly, testing coverage, configuring arming modes, and matching the system to the way the home is actually used.