Miele G4220 U Inlet/Drain light – fills in pulses

Hi,
Have just replaced the flow meter board on my Miele G4220 U as it had F13 error and filled fine, drained fine but would not run. Circulation impeller checked and not stuck. After replacing the flow meter board, we now have slightly different issue. Dishwasher initially drains correctly, then a sound like circulation for a couple of second, then the dishwasher starts to fill for approx 5 secs then stops, inlet/drain light flashes 5 times, Starts to fill again for 5 secs with inlet/drain light on solid, stops filling again and inlet/drain light flashes 5 times. This repeats until the dishwasher fills to correct height just under the triple filter arm. The dishwasher then commences draining. However, the intermittent filling continues at the same time – still 5 secs on with a solid light, 5 secs off with 5 flashes. This continued for a very long time which made us think it was not going to stop so we turned the machine off. Have changed it to the cold water so we don’t drain our hot water tank but no difference. Have tried holding on/off and start/stop simultaneously but that didn’t seem to do anything. Any help much appreciated.