English: If, when pressing the lock opening button, the corresponding LED flashes several times without sending a command to the lock, the Classe 300 EOS is in Secure Lock mode, in which the buttons are only active when there is an audio/video connection between the videophone and the external door station. To deactivate Secure Lock mode: — Remove the Classe 300 EOS from the wall bracket. — Remove the green power supply terminal block. — Move the “Secure Lock Function” microswitch, located on the back of the videophone, to the right. — Reinsert the green power supply terminal block. — Reattach the videophone to the wall bracket. This operation must be carried out by an authorized person.