Clicking noise

I have a clicking noise coming from the refrigerator/freezer. My husband pulled it out and it seems the clicking is from a relay on the mother board. When we turn the freezer setting to off and manully open the damper to the fridge than turn the freezer setting back up the clicking stops but it is now happening several times a day. I am wondering if replaceing the damper or the mother board is recomended. Replacing both is too expensive. What is the most common issue that causes this?