In most cases this is caused by a build up of frost, and suggest you do a 24 hours defrost.
Once defrosted if the freezer still doesnt get below freezing in the top compartment I would switch the super freeze function on, and leave for 6 hours and see if this results in the cubes forming.
Should ice be formed when super freeze is on, this would suggest there is a fault with the thermostat on the freezer, whereby its not controlling the temperature correctly (a freezer should be around -18 degrees).
Please let me know how you get on, I am hopeful a simple defrost will resolve your issue, if it turns out to be the thermostat I suggest you look to arrange an engineer, at which case if you provide me your post code I can recommend someone in your area.
I would recommend you go directly to Beko who charge £126 (including parts and labour) for a one time repair, the local engineers we have used previously in your area do not work with the Beko american style fridge freezers. I should also add, if you wanted to have a years warranty for your fridge your looking at an additional £50, however the chance of it going wrong in the same year is remote.
You can contact Beko service centre on*********** selecting option 1 followed by option 2.
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