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I have a Bosch fridge freezer KGU31125GB/01 which is not cooling either the fridge or the freezer despite the compressor running and all other things looking ok. This happened overnight for the freezer and a couple of days later for the fridge. I have checked most of the sensors which seem ok and suspect the valve magnet may not be passing refrigerant but know little about it. Can anyone tell me how this works please? - I have broken into its electrical input cable which has a source impedance of around 3K so I guess the source is a thermistor, the fridge one I would say as operating a hair dryer in the fridge changes its value. However I cannot currently gain access to it as I think its behind the fridge fan which I can't remove as this requires a very thin star driver. Anyway, does the valve magnet read the impedance value and respond accordingly by diverting refrigerant? If this is indeed the faulty part, does replacing it mean losing refrigerant and necessitate a re-gas? Advice much appreciated. Thanks.