Hi, thank you for bringing this to our attention. When water is detected, this detector beeps 3 times every 3 seconds; when battery is low it beeps 1 time every 30 seconds. Verify that it is dry, that has the correct battery in the correct position and feel free to contact us for further troubleshooting at (800) 633-3991 or send us a Private Message to our Honeywell Home Facebook account. - Maria