The 'climate control' only needs to be ON in humid temps and IF moisture is forming on Frame between freezer and food section. It is a heater.
No temp control on upper panel........
The temp control is pre-set/automatic.
On the right hand fin in food section is a 'thermistor'. Sensor bulb in a plastic clip. IF it has fallen off clip and laying down in food section the fridge will cool continuously causing freezing in the food section of fridge. (Also if 'thermistor' is faulty)
The 'thermistor' can be moved UP for 'cooler' temps and DOWN for 'less cooler' temps if food section. After repositioning 'thermistor' wait 24 hrs. to check temp.
Ice forming on fins in food section can also be caused by door seal leaking...warm air is drawn in.
You can test door seal by placing a bill across door seal, close door and pull bill out. Should be resistance. If bill pulls out easily door is not sealing when closed.
Our fridge is ON 27/7/365 since 2006.
We only need to defrost freezer section about 3 times a year.