THIS INFORMATION IS TAKEN DIRECTLY FROM THE MANUAL FOR THIS ALARM SYSTEM.

The word CHECK on the keypad’s display, accompanied by a “beeping” “Battery” Displays at the keypad, indicates a trouble condition in the system.

To silence the beeping for these conditions, press any key.

1. A display of “CHECK” and one or more zone numbers indicates that a problem exists with the displayed zone(s) and requires your attention. If the CHECK display relates to a fire zone, CALL FOR SERVICE IMMEDIATELY. Determine if the zone(s) displayed are intact and make them so if they are not. If the problem has been corrected, the display can be cleared if you enter the OFF sequence (user code plus OFF key) twice. If the display persists, CALL FOR SERVICE IMMEDIATELY.
2. If there are wireless sensors in your system, the CHECK wireless sensors. condition may also be caused by some change in the environment that prevents the receiver from hearing a particular sensor. CALL FOR SERVICE IMMEDIATELY if this occurs. 
3. A display of “BAT” with no zone number or beeping indicates that the main standby battery in your control is weak. If this condition persists for more than one day (with AC present), CALL FOR SERVICE.
4. A display of “BAT” with a zone number and a once per 40 seconds beeping at the keypad indicates that a low battery condition exists in the wireless sensor displayed. Either replace the battery yourself, or CALL FOR SERVICE. If the battery is not replaced within 30 days, a CHECK display may occur.

POWER FAILURE

If there is no keypad display at all, and the POWER indicator (if present) is not lit, operating power for the system has stopped and the system is inoperative. CALL FOR SERVICE IMMEDIATELY.
If the message “AC LOSS” or “NO AC” is displayed, and the POWER indicator (if present) is off, the Keypad is operating on battery power only. If only some lights are out on the premises, check cir­cuit breakers and fuses and reset or replace as necessary. CALL FOR SERVICE IMMEDIATELY if AC power cannot be restored.

OTHER TROUBLE 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 FOR SERVICE.

FC: A communication failure has occurred. CALL FOR SERVICE IMMEDIATELY.

OC: 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 FOR SERVICE.