Step 1:
Remove one battery of control panel, wait 5 minutes
Step 2:
Press and hold "up arrow" button and insert battery, “ENTER CODE” will appear
Step 3:
Release "up arrow" button
Step 4
Press "up arrow" button and then "down arrow" button 4 times
Step 5:
System will reset and will be armed
Step 6:
Press 0000 and "OK" button to disarm system