We had a six-year-old refrigerator, and last week, the refrigerator was making some noise. I booked an appointment, and the technician showed up within the day. He checked the refrigerator, and I was told the cause of it to make some noise because of its condenser fan. He just cleaned away the dust and debris that accumulated between the fan blades using a soft brush. He was very professional and really knew his job! Thanks, Sub Zero Rogers Masters!