Disclosed is a temperature control system of an electronic shower. The system (1) comprises an electro-hydraulic control housing (2) connected to a cold water inlet (17), to a hot water inlet (18) and to a plurality of water outlets (19, 20, 21, 22). The housing (2) comprises: a control circuit (3); a temperature regulating valve (4); a temperature sensor (5); a selector valve (6) for the water outlets (19, 20, 21, 22). The system additionally comprises a luminous control device (8) electrically connected to the control circuit. The luminous control device (8) comprises at least one input interface (10, 11, 12, 13, 14, 15, 16), the control circuit being configured to select a temperature of at least 65 °Celsius for the water outlet, by means of a coded activation that can be entered through the input interface for the prevention or disinfection of legionella.