If your refrigerator isn't cooling, there could be several reasons for this problem. Here are some of the most common:

1. Dirty Condenser Coils: Over time, the condenser coils at the back of your fridge can get covered with dust, reducing their efficiency and the refrigerator's cooling capacity. You'll need to clean these coils.

2. Faulty or Blocked Evaporator Fan: The evaporator fan circulates cold air inside your fridge. If this fan is blocked or not working, the fridge won't cool properly.

3. Faulty Thermostat: The thermostat controls the temperature in your fridge. If it's not working correctly, the fridge may not cool as it should.

4. Blocked Vents: If the vents inside the fridge are blocked, the cold air cannot circulate properly, resulting in poor cooling.

5. Faulty Start Relay: If your refrigerator's start relay is defective, the compressor might not run, thus, the refrigerator will not get cold.

Here's what you can do to fix it:

1. Clean the Condenser Coils: Unplug your fridge, and using a coil brush or vacuum, clean off the dust and grime from the coils.

2. Check the Evaporator Fan: Check if there's something blocking the fan. If it's not blocked but still not working, you might need to replace it.

3. Check the Thermostat: Turn the thermostat from the lowest setting to the highest setting, listening for a click. If you hear the click, the thermostat isn't likely the issue. If you don't, you may need to replace the thermostat.

4. Unblock the Vents: Ensure the vents in the fridge aren't blocked by food or containers. Rearrange items if necessary for better airflow.

5. Replace the Start Relay: If the relay is faulty, you will likely need to replace it. You might hear a clicking sound when the compressor tries to start.

Note that these are basic troubleshooting steps. For anything more complicated, it's always safer to call a professional refrigerator technician at (877) 375-1466 to avoid damaging your fridge further or causing harm to yourself. If your refrigerator is still under warranty, it's best to contact the manufacturer's customer service for further assistance.