There are a number of reasons why your refrigerator may not be heating . Nevertheless, the first step to appropriate fridge repairs would be to ascertain exactly what is wrong. A number of basic diagnostic procedures will need to be conducted in order to pinpoint the problem and fix the problem you are facing prior to calling in a technician to take a look. That said these preliminary procedures are even used by professional repairmen to determine whether the challenge is an easy fix before moving on to more complex procedures. Below we will quickly run through these preliminary tests.
Assess the refrigerator's power
The easiest way to check if your fridge is getting power would be to determine whether the light is turning . Also you can put your hand on the grill on the back of your unit to feel if it's warm. If it's warm on the back and the light is draining then you certainly do not have a power problem. But if the power is off, then You Have to run through all these troubleshooting steps:

Check if the power cord was plugged . If it's not then plug it correctly.
Is Freezer repair working as it should? The socket could be tested using a professional or multi-meter. You can even plug something else to the socket to see if that works. If the socket is not working then that's where your problem lies, or even then you want to proceed.
Some refrigerators have a power switch which has to be turned on. The switch can at times get turn off by mistake when you are moving things around.
The refrigerator door needs to be closed
The fridge door should obviously stay closed at all times for the cold air not to escape the confines of the unit. In addition, the fridge should be on a flat surface so the door can be correctly closed. Always check that you don't have something in the unit which may be preventing the door from closing fully. If the problem is not fixed occasionally it may lead to the gasoline leaking and necessitating extensive fridge repairs.
Defrost the refrigerator
If you notice that ice is collecting within your refrigerator which may be hindering its performance then defrost it. The idea is to turn your refrigerator off and keep it off till all the ice melts. Then turn it back on once you have cleaned it thoroughly.
Hear Whether the fan in the refrigerator is working
Place your ears to the bottom of the refrigerator to hear if the lovers in the unit are working. There should be two fans that you're able to distinctly hear running i.e. one inside while another is located at the base. If these fans aren't working or one of them is not working then check if something might be blocking it. But if there's nothing obstructing it then there might be an additional cause for it not working and so you will have to call a fridge repairs specialist who can replace the fans.