Hisense RC33A1GWE Manuel De Fonctionnement De L'utilisateur page 14

"7"
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 0, and then adjust to the appropriate
gear until there is no water bead
,
attached on the evaporator.
" 7"'