fridge temp will rise if you are opening and closing the door a lot during the day.Best time to test temp is when left overnight unopened and provided the temp is around 3-4 deg it is working.Most people don't realise that the recommended temp during the day in a well used domestic fridge is above 7 deg!!
ck
January 2012
fridge between (3° and 5°c) ideal freezer setting -18°c
ozone
January 2012
NO.
Needs to be max 4 preferably about 3, with the weather, colder outside than in your fridge.