I am having the same problem, tried to get fridge repaired by two local tradesmen, Newcastle upon Tyne, no success, they don't do work on Hoover Frost Free Fridge Freezers and said that repair was unreliable.
Have looked at replacing with an Indesit Frost Free Fridge Freezer from Currys £299, was advised to replace rather than have Hoover Company repair because of cost.
Have defrosted fridge and it is building frost up slowly, so giving me time to make a decision about the best replacement.
Eliz, September 2010