Yesterday, we took delivery of a new Siemens Fridge Freezer. We waited the prerequisite 8 hours before switching it on (despite it saying only 30 mins in the manual) and we’ve set the control to the recommended setting for 4 degrees. However, 12 hours later, it still doesn’t actually feel cold in the fridge compartment and the thermometer is showing 5+ degrees. Even altering the temp setting doesn’t seem to make any difference. Our old FF felt colder than this.
They can take a while to get down to temperature, depends on the conditions but I would have thought it should have been there or thereabouts after twelve hours. So, you might have a problem.