servis frost free fridge freezer probs???

Hi i hope someone can help me with a prob i have with my servis frost free fridge freezer SERIAL NUMBER:20034927324-038077071-03 which ive had now for about 2/3 yrs. The warning light keeps flashing and it also makes a clicking noise (WHICH IS BECOMING VERY ANNOYING)! Ive tried the small button which is on the inside of the fridge door but no matter what you do it won't stop, sometimes is just a constant clicking and other times it goes really fast.

I hope someone can shed some light on this problem as its driving me mad!!