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