-Check ventilation around the fridge. You need 20 -30mm at sides, 10mm at the top with 100mm at the rear. 

-The unit cannot have another ‘door’ in front of the fridge door, this is incorrect installation and voids warranty

-The unit must be 100% away from sunlight and out of the weather, this is incorrect installation and voids warranty

 -Check compressor definitely comes ON

 -Check inner fan is going and that there is NO ice build up on the inner rear wall

Check if you can feel a slight breeze coming out of grill at the front when the compressor is on.

Check the temperature the fridge is set on.  If the fridge is set on 2 it will cycle between 2 - 6 and keep your milk at 4 degrees Celcius.