Abstract: The unit is of the type comprising a vessel which is mounted to be movable between a position of use and a cleaning position. Cleaning means are actuated when the vessel is in its second cleaning position. Programming means co-ordinate the action of means for displacing the vessel and means for actuating the cleaning means in the course of each cycle of operation of the sanitary unit.The programming means comprise detectors for producing signals each of which represents a given situation of the sanitary unit, memory means connected for storing said signals, and relay means connected to the memory means for exciting the control and actuating means.