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Dishwasher - water pressure too low/tank water

We have a new dishwasher (Kleemaid DW6021). It starts to fill and I can hear it draining but is stops and errors after a few mins with ‘Long Fill time’ water pressure too low. The inlet tap is fully open & Ive check the mesh filter at the hose connections. We have a grundfos pump MQ3-35 AOA BVBP. I’m unsure if the washers fill time can be increased or if the pump pressure can be increased without damaging any connections or fittings in the rest of the house supply. There is also an aqua stop on the inlet hose - unsure if this is creating a step down in pressure.