First Alert FA120C - Manual (Page 28)

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(continued)
TROUBLE CONDITIONS
Other Displays dl: If this remains displayed for more than 1 minute, your system is
disabled. CALL FOR SERVICE IMMEDIATELY.
CC: The system is in communication with the central station for change of
function or status verification. If this message persists for more
than 10 minutes, CALL YOUR SERVICE COMPANY.
FC: A communication failure has occurred. CALL FOR SERVICE
IMMEDIATELY.
O C The keypad is not receiving signals from the control panel and sees
an open circuit. If this message persists for more than 10 minutes,
CALL YOUR SERVICE COMPANY.
FOR SERVICING INFORMATION,
SEE PAGE 43