This European standard specifies the particular requirements for washer-disinfectors intended to be used for cleaning and disinfection of thermolabile re-usable medical devices including flexible endoscopes used in the context of medical, dental, pharmaceutical and veterinary practice. This standard also specifies the performance requirements for the cleaning and disinfection of the accessories which may be required for type testing, works testing, validation, routine control and monitoring and re-validation, periodically and after essential repairs are also specified.