Ademco alarm systems typically have an overall control unit pad, as well as differing numbers of monitoring sensors placed in strategically sensitive areas. These sensors are used for burglary, fire detection and emergency issues.
The control pad on most modern alarms systems flashes error codes to facilitate quick troubleshooting solutions. For Ademco systems, the term "fault" typically means an area is not secure to arm the system. "FC" means that the phone line is not communicating properly; "Low Batt" signifies that the system needs a fresh battery to continue operations.
The Ademco system has audible error codes to help troubleshooting. If the display is malfunctioning -- and not presenting the visible error codes -- listen to the tones emanating from its bell system.