Having a refrigerator that is not getting cold enough is both costly and unhealthy. Food can spoil much faster than the expiration date and can make you sick. Normally the problem is one that is easily fixed.
1. Defective Door Switch
The door switch is located along the internal frame of the refrigerator. It turns the light on when the door is opened and off when the door is closed. If the switch is not operating correctly, when the door is closed the refrigerator will not resume cooling and if the interior light stays on it will also affect the temperature because of heat from the interior light.
2. Condenser Coils Dirty
Condenser coils are located either under or in back of the refrigerator. If you find that these coils are dirty, unplug the refrigerator before attempting to clean them. If the coils are dirty they will not let the refrigerator cool properly.
3. Defective Door Gaskets
Refrigerator door gaskets keep the cold air in when the door is closed as long as they have a proper seal. Gaskets can become loose or damaged therefore letting cold air leak from the refrigerator. Constantly opening and closing the refrigerator door lets cold air out and warm air in.
4. Temperature Control Not Working Properly
If the temperature control thermostat is faulty the refrigerator will not maintain the correct coldness. Check your refrigerator temperature to determine if it is set at the correct level. A normal refrigerators setting is usually around 32 degrees Fahrenheit (0 degrees Celsius) and 1.4 degrees Fahrenheit (-17 degrees Celsius) for the freezer.
Refrigerator Temperature Control Thermostat
5. Frost-Free Feature Not Working
When the frost-free feature is not working it will cause a buildup of frost around the evaporative coils in the freezer. This in turn causes the evaporator fan to malfunction and not be able to blow cold air around. Should the fan hit the frost it could be damaged.
6. Air Flowing Inside The Refrigerator Is Inadequate
If you have your refrigerator stuffed with food and everything is crammed together then the air will not be able to flow freely inside the refrigerator. This will not allow a correct temperature of coolness to flow around your food items. Not having enough food items in the refrigerator will also cause it to function inefficiently.
7. Clogged Vents Between Freezer and Refrigerator
Cold air flows through vents between the freezer and refrigerator. If ice forms in the vents the air will be blocked from flowing into the refrigerator thus not letting the refrigerator cool down properly. If this happens you can unplug the refrigerator and let the ice melt, then reconnect the refrigerator.
8. Leaking Refrigerant
This is not very common but if you suspect this is your problem it would be wise to call a qualified service technician.
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