Sometimes a spell in the freezer is not quite enough to reset the thermostat. After taking out of the freezer drop it onto a work surface from about 30cm. Afterwards give it a little shake near your ear and you should hear something rattling. Don't worry its not broken- its actually the sound it should make when its working properly. Pop it back into the machine exactly as removed and it should work. Sometimes the reset will only work a few times before you need to replace the thermostat. They can be purchased on line for about £20.
christian winter, July 2016