This indicates the controller has detected a leak, and a command has been given to the valve to turn off the water supply. Press RESET, and if the sensor is dry, the valve will reopen, the sound signal will stop, and the blinking LED light of the affected zone will turn off. If, however, a leak is still present after the RESET button is pressed, the audible signal will stop, but the valve will remain closed. It will then be possible to see in which zone the leak is located; the damage will have to be dried off and the problem solved before you can press RESET once again to open the valve.