hotpoint iced diamond rfa51p high temp?

ive had the fridge/freezer for 12months and its never been a problem,two days ago the high temp warnig light came on and both the freez er ang fridge have stopped working ? now when i turn the unit on from the plug theres a quite buzz which last for about 6-10 seconds then a single clich sound then nothing if i switch it off after about 1 minute theres another click,then if i repeat the process the same thing happens does anyone have any ideas as to solve the problems please ?