Going to this dishwasher fri customer complaint that it starts to fill then check water light flashes and it starts to drain then fills then drains keeps doing this could this be a blockage in pipes or metering tank 😆
Check the flow meter (bosch call it an impeller jug??) as this can cause the fault.
Situated on the LHS looking from front. Water flows though this turning a wheel with a magnet on it. It causes the reed switch contacts to make/break sending puls to module