Refridgerator side not cold freezer side fine

Difficult to properly diagnois with such a brief description, but try the following as a good first step at correcting the problem. Reset the freezer and fridge thermostat settings at the factory default. Also, check the freezer section to make sure nothing is blocking the cold air supply vent into the fridge, do the same on the fridge side too.

Normally is the freezer is working fine, and the fridge is warm, it can be due to either a blockage of the cold air cross vent by items in either the freezer, fridge, or both, preventing proper cold air flow from the freezer into the fridge. Also, check to see if the cold air vent is not frozen or obstructed, with a fashlight (you;ll need to remove stuff from fridge and freezer to make this possible to check.

If the vent is not obstructed and you can clearly feel cold air passing from the freezer into the fridge, it is possible that the cold air vent control has ceased operating properly and needs to be replaced. Usually though this type of problem is caused by people over stuffing things into the freezer section and blocking the cold air cross over vent. Hope this helps.