Can my 5 yr old Hoover frost free fridge freezer be repaired /?

The fridge of my 5 yr old half n half Hoover fridge freezer has been freezing up lately - salad stuff / milk was solid in the fridge although the dial was still at 3 - highest 5 -I have scraped all the ice off the back wall, spaced food out into door and drawers, but it freezes up again next day. Is it worth calling out a repair co. or is it beyond economic repair? The appliance is in good general condition and the freezer works fine.