This is a typical problem. The hinges get corroded by drips from the dispenser usually. The hinge should be replaced. Often a screw or two will not come out. It's best to get the screws too. They aren't to expensive. There was a change at one point - the hinge was modified. From what I recall the new hinge works with the old panel and door but it takes a different amount of screws. If you provide your model and serial number I will look up any changes that may apply.