If you press the door open button and the corresponding LED flashes several times without opening the door, your Classe 100X is in "Safe Lock" mode. The button is then only active if there is an audio/video connection between the indoor unit and the outdoor unit. To deactivate the "Safe Lock" mode: - Remove the Classe 100X from the wall bracket - Remove the green power supply terminal - Position the "Safe Lock" microswitch on the back of the indoor video unit - Reconnect the green power supply terminal - Replace the indoor video unit on the wall bracket