LES PETITS CHAMPS CAVC15 Manual De Usuario página 14

For direct cooling, some kind of irregular cracking, hissing,
bubbling, crackling can often be heard when the
compressor is running for a while or has just stopped.
This sound is caused by the relief of stress due to
expansion and contraction when temperature changes,
and will not be affected by normal application of the
product.
The compressor consists of an electric motor and a
compression device. Due to the heat produced during the
compression of the refrigerant, it is possible especially in
summer when the ambient temperature is higher that heat
is emitted by the cellar. All of these phenomena are
normal.
To reduce some noises:
First, make sure your cellar is on a level surface.
Location is important, do not lean the cellar against the
wall.
The bottles must be correctly loaded to avoid parasitic
vibrations.
The noise may come from the circulation fan, check that
nothing is interfering with its operation.