try to check the main system panel not the keypad for the model# of your system
it's a Napco system you got there....If it's the Express model then:
The panel has one or more of the following 3 possible troubles:
- Transmitter Tamper
- Dual Tech Self Test Fail
The triangle SYSTEM LED and keypad sounder will
continue to flash and beep. To view the next
System Trouble, if any, press the # key.
Continue pressing the # key, if there are no
more system troubles to view, the system will
return to normal operation.
Let me know if it works....
Not sure how your system is setup but this might work.