Some fridge freezers will not work if the ambient is is below
about 6 or 7 deg c.
Majority of domestic fridges/freezers require a minimum of +13oc and some even +18oc.

At a guess your unit maybe stuck on defrost,At the rear next to the compressor ther is a small bos with a small round slot in it. turn the slot clockwise slightly,If it starts then you have either a defrost timer fault or a defrost circuit problem.

Bryan