My fridge is warm the freezer is cold, the fan is running in the freezer. The door is open where the sensor is in the fridge control knob. What could it b? The temperature control in freezer? Or the fan?
If the damper is open, the fan running and the freezer temperature ok then you will want to check to see if you are having a defrost issue. You may see frost on the back wall of the freezer. If you do not then pull the rear cover of the freezer compartment and check to see if the evaporator coils are impacted with ice. If it is then you will need to check the continuity of the defrost bimetal 5303917954 and the defrost heater 218169802. If either one of the parts does not show continuity then replace that part. If both have continuity then you would need a new defrost timer 215846602.