I have a whirlpool Fruu2vaf20 American style fridge freezer . the fans keep going all the time. I checked for a fault code which came back as 2 . so I replaced the damper and fully defrosted it for 24 hrs. This fixed the problem for about 4-5 weeks. Now its doing it again and I noticed a build up of ice around the damper. Can anyone tell me what to do next please. Thanks