If when you press the lock unlock button, the corresponding LED flashes several times without activating the lock, this means that the secure locking mode of your Classe 300 EOS is activated, the buttons are therefore only active if an audio/video connection is established between the videophone and the video street panel. To deactivate the secure locking mode: - remove the Classe 300 EOS from the wall bracket - remove the green power supply terminal - move the microswitch for the secure locking function, located on the back of the device, on the Home + Security control panel to the correct position - reinsert the green power supply terminal - reinsert the videophone into the wall This operation must be carried out by an authorized person.