Not freezing, or food going soft
What you see
Ice cream is soft, meat isn't hard, or the temperature is well above -18°C.
Likely causes
A door that doesn't close or a worn seal, drawers packed so tight that air can't move, or dust on the condenser. After that: a No Frost defrost fault, the evaporator fan, a sensor, a refrigerant leak, or the compressor and its start parts.
Safe to try
Check the door closes and the seal is clean, don't overfill the drawers, keep space around the freezer, and give it a few minutes after a power cut before judging.
Technician
The technician measures the temperatures, checks the defrost system, fan and sensors, and tests for leaks before any refrigerant is added.


