The compressor is running but neither the fridge nor freezer compartments are cool.
The unit is only 2 1/2 years old and is a replacement for the same model that failed within warranty.
Have checked around the back and all seems clean and clear.
We’d need the service number to even take a look at it for you.
Best guess based on above with the age and the fact it’s Liebherr so I can’t think the compressor would have failed like that at the age, probably just a sensor problem.
When it is run for a while and switched off one can hear the liquid in the coils in the back of the machine.
Wouls I be right in saying there is no leak?