Dishwasher and control method thereof

A dishwasher (1) comprising a wash tub (2) in which the dishes to be washed is placed, a sump (3) which is in the lower section of the wash tub (2), where the water present in the wash tub (2) is collected during washing operation, a circulation pump (4), driven by an electric motor with variable rpm, turning the water in the sump (3) back to the wash tub (2), a drain pump (5) which drains the water collected in the sump (3) at the end of the washing operation out of the dishwasher (1) and a filter (6) preventing the dirt from getting into the circulation during washing and thus decreasing the effectiveness of washing, characterized by a control card (7), tracing the change of the current (I) drawn by the circulation pump (4) from the network, determines the effects such as rotor blocking, pump felt sticking, filter (6) clogging and increase of the viscosity or the amount of foam in the washing water that influence the washing performance negatively, and provides the solution by changing the rpm and/or direction of rotation of the circulation pump (4).