I have one of these machines which has been repaired repeatedly by Samsung but keeps on breaking down. They use a sub-contractor (G max) who replaces all the working parts, fan, temp sensor etc., The last repair lasted 4 weeks. You can access a video of how to DIY it on youtube as it's a common problem. I'm told the parts are available on e-bay, at a cost of about £70., though I think you're putting good money after bad.......