The present invention relates to a dialysis machine in particular a peritoneal dialysis machine to which a fluid system having a multi- chamber container having at least two chambers can be coupled which chambers have individual solutions and are separated by a separating arrangement to be opened mechanically comprising a controller and at least one sensor for determining a measured variable in the fluid system wherein the controller has a device for automatically checking if the separating arrangement of the multi- chamber container is opened properly which device automatically checks if the separating arrangement of a multi-chamber container of a fluid system coupled to the dialysis machine is opened properly based on the measured variable determined by the sensor.
