AEG Santo Fridge won't cool, probably more than just blocked evaporator

[Salli]

Hi a few months ago my AEG fridge freezer's alarm started beeping and the fridge would stop cooling. I was advised to turn off the whoe fridge freezer with the freezer door open for about 6-10 hours and that would fix the problem (blocked evaporator). It did and usually the fridge alarm won't beep for a few days, sometimes weeks. This week the fridge stopped cooling without any alarm beeps, and turning the fridge freezer off for a while doesn't seem to fix the problem anymore.

Any ideas? I hope I don't have to buy a new fridge as this one was already too expensive!

Many thanks!
Jennie x

[spimps]

If evap is blocked switching off for 6 -10 hours isnt enough. 24 hours minimum with freezer empty and both doors open.
Any sign of frost in freezer,on food or back plates is indication that evap is blocked.

[Salli]

Thanks, I'll try 24 hrs. Do you know why the fridge alarm used to beep but now it no longer goes off?