Your fridge/freezer is frozen up, now I know what you are going to say "but its a frost free model" trust me I work with these all the time, it has an ice blockage in the evaporator which is housed inside the freezer part behind a panel. To cure it leave the unit switched off for at least twelve hours at room temperature with the doors wide open and then switch on and it should work but it might happen again after a few weeks if it has got a fault with the defrost timer or heater.
powerhousesteve@hotmail.com, April 2006