Certified Refurbished is an item that has been professionally restored to working order by a manufacturer or manufacturer-approved vendor. This means the product has been inspected, cleaned, and repaired to meet manufacturer specifications and is in excellent condition. This item may or may not be in the original packaging. They also contain warranty from manufacturer from 3-6 months.
P.S: None of the above condition machines are faulty or defective. You'll be at no risk buying either of above conditions so purchase with peace of mind and give it a try, you won't be disappointed. :)