My KitchenAid KFIS20XVMS1 refrigerator developed a clicking noise. It would click randomly and the sound was coming from the bottom of the fridge behind the back panel. After reading other posts, people had the same symptom but it was accompanied by the fridge not cooling properly. I did not have the cooling issue, just the clicks. I first replaced the run capacity, but that did not make a difference. Then I replaced the compressor start device and my fridge is now back to being quiet, no more clicking. The repair was easy.