Wind energy is becoming one of the best renewable energy options. In recent years, offshore wind turbines have been developed, moving away from the coast, searching for a higher quality wind resource with a lower environmental impact. However, the greater the distance from the coast, the deeper the sea depth, making the cost of fixed foundations prohibitively expensive. It is in this context that floating wind turbines have been developed. Faults in wind turbines can arise in different and diverse components, such as the pitch control system, the gearbox, electrical generator, etc. Mathematical models either focus on the dynamic behaviour and energy generation prediction at healthy states or the analysis of faults and reliability aspects.