Thanks. I've done a fair bit of experimentation thus far. Depending on the wash program selected the volume of water being drawn in initially varies. I can feel and hear it coming in on both the hot and cold supplies (I've checked these for flow rates off the machine and their fine). Once the initial fill completes the flow stops which would suggest that it's not siphoning. It seems that as soon as it changes to the rinse cycle that the slow / restricted water intake issue presents. I'm leaning towards a problem perhaps in the controller, my next test would be to see what voltage is being delivered to the inlet valves during the initial fill and then compare that with what happens when the rinse cycle is selected.
Any suggestions as to how to test the valves would be useful, in terms of expected resistance across the terminals ?
The machine model name is also Aqualatis, I'm not sure if that has any links to the Hoover machine of the same name and whether this maybe a common fault ?
Thanks for any suggestions you can make !