This article reports on the findings of a planned workplace health promotion intervention, and the aim is to identify conditions that facilitated or restricted the learning to promote health at an emergency care department in a Swedish hospital. The study had a longitudinal design, with interviews before and after the intervention and follow-up interviews one year after the intervention. Data were collected through individual interviews with employees and managers, in total 69 interviews. In addition, data were collected from documents. The study provided insight into conditions which were found to act as expansive and restrictive reinforcements for learning to promote health. The conclusion is that the workplace health promotion intervention was shaped by conditions that existed outside the local workplace level which restricted the workplace health promotion. Nevertheless, collective employee-driven activities had the capacity to facilitate learning for change in order to create a health-promoting workplace. The advantage of combining theories of learning and workplace health promotion provided a holistic analytical view of learning to promote health at work and helped to uncover and monitor changed conditions during a planned workplace health promotion intervention.