CONTINENTAL EDISON CERA432DIX Guide D'utilisation page 75

Warning:
This indicator is intended to work only with your refrigerator, be careful
not to use it in another refrigerator (in fact, the colder zone is not the
same), or for another use.
CHECKING THE TEMPERATURE IN THE COLDEST AREA
Once the temperature indicator has been installed, you can check
regularly that the temperature of the coldest zone is correct, and, if
necessary, adjust the thermostat accordingly as indicated above.
For proper storage of food in your refrigerator and particularly in the
coldest area, make sure that the temperature indicator reads "OK". If
"OK" does not appear, the average temperature of the zone is too high.
Set the thermostat to a higher position.
OK
Whenever you change the thermostat, wait for the temperature inside
the device to stabilize before proceeding to a new setting if necessary.
Do not change the position of
Thermostat gradually and wait at least 12 hours before proceeding to
a new check and a possible modification.
NOTES:
After loading the appliance with fresh food or after repeated opening
(or extended opening) of the door, it is normal that the word "OK" does
not appear in the temperature indicator.
Wait at least 12 hours before readjusting the thermostat.
EN-33