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  Christopher at eSpares says...

  There is a common problem on Bosch dishwashers that can cause this problem. Take of the top and right side panel and you will see a red 'float' in an open chamber about 100mm from the base in the middle. On fill water passes this float to the sump through a hose, this hose blocks from grease build up causing the water to raise the float prematurely whilst filling. The machine thinks it has overfilled and turns the pump on to drain. This cycles repeatedly. To cure this remove the hose to the base (it pushes into place) and clean before reassembly. Use a dishwasher cleaner to prevent reoccurrence.