Access the most important service information on the RATIONAL cooking systems iCombi Pro, iCombi Classic, iVario, SelfCookingCenter, CombiMaster Plus and VarioCookingCenter with TechAssistant app mobile. Use the access data for the RATIONAL business customer portal to log in to the TechAssistant App. The following functions can be accessed on the home screen. Information / device search Search for device-specific information, such as circuit diagram, service parts and additional information