CONTINENTAL EDISON CERA612APPIX Guide D'utilisation page 88

Noise
When operating the refrigerator for the first time, it runs at high speed to
cool down quickly and the sound may appear to be louder. When the
internal temperature falls below a certain level, the noise fades.
If you have the impression that something is bumping into something
else inside the refrigerator, this is normal.
This sound is due to the high speed operation of the compressor. These
are normal noises.
Hot compressor
In operation, the external temperature of the compressor is above 80 °
C. Please do not touch the compressor as this can cause serious injury.
Compressor running for a long time
When the ambient temperature is too high or when too much fresh food
has been placed in the refrigerator, it takes time to cool the refrigerator
and for the appliance to operate at the desired temperature.
EN-40