There's an inlet valve - a solenoid operated inlet - they often fail - they're easy to change - or you can get a service call and have someone do it for you - you find the inlet valve just where the water inlet pipe attaches - the water inlet pipe screws onto the valve body - a couple of screws and a couple of wires.
Be sure to turn the tap off before you undo the pipe connection!
Good Luck...
December 2015
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