Siemens SF24T252GB/01 Dishwasher Check Water Light Comes On & Doesn’t Continue Cycle

I have a Siemens SF24T252GB/01 Dishwasher. After starting the dishwasher in a wash cycle, I can hear motors working and water gurgling, but after up to 1 minute the water check light comes on, but motors and gurgling continue then pause, for a short while then starts again. At this point, opening the door shows water accumulating at the bottom of the machine above the level of the ss filter grid. This continues for two or three times, and eventually stops At this point the bottom of the pan is full of water, but not overflowing. If I now do a reset, the water empties via the drain pipe and shortly no water is left in the bottom of the pan.Have checked and cleaned filters, confirmed correct volume of water flow from my supply. I then removed top and left sides, I removed the two wires to the aquastop valve. Applying mains power to the terminals of the cable to the aquastop valve causes clicking as the solenoids try to actuate. To ascertain the solenoid function, I removed the inlet hose from its position inside the machine, beneath the weird water channel assembly, to enable me to monitor outlet from the water pipe, which was positioned to fill a bucket. When I dubiously switched on, expecting a fast gush of water, water did flow but very little.This leads me to suspect that the aquastop solenoids are indeed not opening fully.Would you agree with my suspicions, please?I know that it is possible to obtain the valve separate from the hose. Would this be a viable solution or should I buy the complete hose. There are several sources on the net, but would you have any recommended supplier-please? I might add that for all its years, the machine has not been used very often.Thanks.