Get your head inside it and get down to the very bottom. Undo one Torx screw and remove any crud around the impeller of the drain pump.
Good Luck...
July 2016
Ash. You might just consider giving us a clue. From WHAT is the water not draining?
It would be really lovely to see a brief, concise and comprehensive description of the symptoms and what the item in question actually is (make and model).