My Fridge isn't cooling?

Check clearance, a minimum of 20mm at the top and sides

and 100mm at the rear is required.

Ensure zero sunlight exposure.

Check thermostat settings- Higher numbers are colder. 

If these are set too high, they will ice up at the back and make your freezer warmer.

Between 2 and 3 is preferred.

Check compressor is operating.