if the machine stops filling when you either stop/pause or pull the power plug it isn't the water inlet valve,.
Check the pressure switch especially the tube which connects onto the switch from the drum,
sometimes this tube gets blocked,pull the tube off the switch and blow down it,
adding too much detergent can cause this issue,
the pressure swich is accessible by removing the top of the appliance,
its on the right rear hand side,and looks like a cylinder about 3 inches long.
one end has wires the other has the tube,if the tube isn't blocked,then check the wiring connector for security.
Failing that then replace the switch.
paul, March 2012