It doesn't help your situation, but we have the exact problem with our Samsung French door fridge RF266. Everything seems fine except now, after the defrosting procedure, the freezer isn't cold. For awhile, the temperature was reading 0º but the freezer was actually room temperature. The compressor is working, the fan is working---it has to be something small. We tested the thermistor in the refrigerator when we did the manual defrost and removal of back panel. It's working. I'll post if we figure anything out. Please do the same. Best of luck!