Is the water definitely going in? Start wash cycle and lift the lid and watch. The bowl will be turning around and a strong flow of water coming in. If it is then check the drain hose is not too low. It should come up to the level of the lid before going down to any drain. If it is in a drain standpipe, try pulling it up a bit higher. Too far down a pipe and it can cause a vacuum that will syphon the water out. Let me know if that works.
Lincoln Appliance NZ, January 2015