When the machine was installed and fitted into its housing the soft flexible water fill pipe may have got trapped or crushed causing it to kink and not let the water flow through. Carefully pull the machine back out and examine the hose for twists or kinks. You could try the machine pulled out and if the water flows through it looks like the pipe has been kinked. In most cases not permanent damage will have occurred to the fill hose, simply re fit the machine taking care not to trap the pipe. Once back in place try the machine again making sure water is coming in.