I’ve got a problem with it, i know pretty much bugger all about fridges so can anyone help? got up this morning, the freezer has defrosted and the fridge compartment is not cooling at all. sounds a little noisier than normal @ times, bit of a buzzing sound. also, it has a switch with an orange light next to the temp dial in the fridge. what does this do, and should it be on or off ? i can’t find the user manual to find out what it does. any suggestions much appreciated, cheers.