[RiseofAsia]

Your condenser coil/fan coil is probably very dirty

Switch off the fridge power
Push out your fridge. 
Use paint brush to clean away the dust from the condenser coil/fan coil.

Once your condenser coil is covered with thick layer of dust. The heat exchange to remove heat from the fridge become less efficient.
This also same apply to your aircon if it is not cold. Just need to clean the condenser coil using paint brush or use water hose to spray water into it normally installed outside the aircon ledge.

If spray water, need to do it during rainy day and switch off the aircon main power. Use paint brush is good enough.