Abstract: The invention relates to an automatic dishwasher (1) which can be operated in several operating modes (71, 72, 73, 74). The automatic dishwasher (1) proposed according to the invention can be switched from a first operating mode (71) to a second operating mode (72) only when a third operating mode (73) called kosher operation is executed. During the third operating mode (73) “Kosher operation”, the interior of the automatic dishwasher (1) is cleaned with a heated cleaning fluid whose temperature lies above the maximum temperature occurring in the normal operation of the automatic dishwasher (1). The endless conveyor belt (10) of the automatic dishwasher (1) is treated by a cleaning device (43) during the third operating mode (73) “Kosher operation”; moreover, a water tank (25) of the automatic dishwasher (1) is heated to a higher temperature than the temperature which occurs in the normal operation of the automatic dishwasher (1).