Hi. I have just got a second hand Samsung RL41WGIH fridge freezer. I let it stand over night then the next night I turned it on but when I checked the next morning it hadn’t cooled down both temperatures are showing 18. I adjusted the temp but in the manual it says the display should flash when adjusted but mine doesn’t. Every thing sounds like it’s working but the temp is still 18. Am I doing something wrong or is it broken. Help greatly needed. Thanks