For irregular blinking, please check that the machine is not in descaling mode (fast and regular flashing). With the machine ON, try to exit descaling mode by pressing both buttons for 3 seconds. The machine should stop blinking. If there is no light, it means that this machine switches itself OFF automatically after 9 mins (factory settings). This time can be changed to 30 mins. Procedure: - Switch the machine OFF. - Press the Espresso button for 3 seconds - The Espresso button will blink to indicate the current setting (once for 9 mins, twice for 30 mins)- Press the Espresso button once for 9 mins or twice for 30 mins- To exit, press the Lungo button for 3 seconds