After I threw away the instruction manual to this device, I realized that the alarm was only going off on weekends. Here's what I figured out: The CKS1702 has three possible alarm modes: everyday, weekdays, and weekends. Press and hold the alarm button and a code will appear. While holding the button, use the set +/- buttons to toggle the setting. Here's the codes: 1-7 = Everyday 1-5 = Weekdays 6-7 = Weekends