Purpose: This research investigated consumers’ reactions to service failures, based on Weiner’s attribution theory, by simulating two situations: a teacher that is late to class and a delay in a course registration service.Method: Students at an educational service (n = 388) responded to four versions of scenarios, combining external and internal causes with teacher delay and enrollment problems.Findings: Factor analyzes inductively reflected the theoretical organization of the model: Negative Behavior, Positive Reactions, Internal Attributions, and Negative Emotions. Internal causes led to internal attributions, negative emotions and negative behaviors. Originality: The central role of moral emotions on the attitude towards complaining behavior is discussed, as well as the importance of implementing simple and low-cost managerial measures to improve the quality of care service.