Lisa H Austin , TX July 25, 2015 Appliance: Samsung Refrigerator RF217ACPN/XAA Samsung Refrigerator Rf217acpn/Xaa / : Ice build up on refrigerator fan. How to replace Refrigerator Temperature Sensor. Replaced sensor and motherboard using YouTube videos as teaching tools. I am still waiting for Samsung repair company schedule a repair visit... although they have called me 4 times to check if I have been helped yet. If ya want it done, do it yourself. Do-It-Yourself Rating: Repair Time Estimate: 2+ hours