[. . . ] Press and hold the MODE button for 10 seconds to enter configuration mode. [. . . ] to change the current selection , press the + button , then press the MODE button to confirm and exit the configuration mode. You can unlock the keypad by entering the configuration mode again (pressing the MODE button for 10 seconds). The protective units and other accessories required by the standards are not illustrated. The MODE button is used to select the different operating modes of the thermostat ((2) Comfort (3) Economy , (4) Frost protection , (5) Off , ). [. . . ] Do not leave the flat batteries in the device (the guarantee does not cover damage caused by defective batteries). [. . . ]