Hisense RC16A1GBE Manuel De Fonctionnement De L'utilisateur page 8

Suggestion：If in use for a long
time to hear the evaporator
banging sound
During use, the sound of ice cracking
is caused by thermal expansion and
cold contraction, which is a normal
phenomenon.You can manually adjust
the knob of the temperature controller
to OFF, and then adjust to the
appropriate gear until there is no water
bead attached on the evaporator.