In many countries, student teachers are not adequately prepared to teach programming in technology education once they have completed their training. There is a corresponding inadequacy of research regarding pre-service programming education in technology, although in recent years research in this area has increased. There is, however, a lack of research specifically regarding student teachers’ preconceptions about programming, which would be important for developing competences needed for teaching in technology. This paper presents a study with the aim of describing student teachers’ preconceptions about teaching programming in technology. The study uses a phenomenographic approach investigating eight student teachers’ preconceptions after a five-week technology course preparing for primary education, grades 4-6 (teaching pupils aged 10-12). Semi-structured interviews have been conducted with student teachers from two different higher education institutions in Sweden. From the first step of the analysis, three tentative categories have been obtained, describing student teachers’ preconceptions as: 1) an understanding of a language and/or a tool, 2) an understanding and use of a language or a tool to solve technological problems, and as 3) a way of understanding and describing a technological environment. The results of the study will contribute with research-based knowledge useful for developing new approaches on how to vary and design the teaching of programming in technology for student teachers to develop skills that are important for their future profession.