System and method for remote maintenance of user units

An aim of the system and the method for remote maintenance of user units according to the invention is to allow an efficient diagnosis of failures in a reduced time. Each user unit, connected to a management server, via a communication network, transmits to the management server state data related to hardware and software parameters associated to an operating mode of the user unit. The method includes steps of: storing state data in a memory of the user unit, monitoring state data stored in the memory, and detecting at least one datum of a state indicating an operational failure of the user unit. When a failure is detected, state data corresponding to current states of the user unit at the moment of the failure and state data corresponding to the states stored during a predetermined period before the failure are extracted from the memory and transmitted to the management server which determines a statistic correlation coefficient between the values of each state of a user unit and the values of states of other user units.