16 Reasons for Samsung Refrigerators Not Cooling and How to Fix It

16 Reasons for Samsung Refrigerators Not Cooling and How to Fix It

When your Samsung refrigerator isn’t cooling as it should, it can be a cause for concern. After all, we rely on our refrigerators to keep our food fresh and safe to eat. Fortunately, there are numerous potential reasons for this issue. In this comprehensive guide, we’ll explore each one in detail and provide you with practical solutions to get your refrigerator back to its cooling best.

1. Check the Door

One of the most common reasons for a Samsung refrigerator not cooling correctly is a simple one – a partially open or improperly closed door. If the door isn’t sealed tightly, it can lead to temperature fluctuations inside the fridge, causing food to spoil prematurely. To address this issue, always make sure the refrigerator door is closed securely after each use.

Additionally, inspect the door seal for any cracks or holes, as these can allow air to escape, forcing the fridge to work harder to maintain the desired temperature. If you find any issues with the seal, consider replacing it or using a door sealant for a quick fix.

2. Exiting Demo Mode

In some cases, your Samsung refrigerator might be stuck in demo mode, a mode typically used in stores to showcase the appliance’s features before purchase. To exit demo mode, you can follow a simple procedure: press and hold the “Power Save” and “Lightning Bolt” buttons simultaneously for three seconds. This action should trigger a beep and return the control panel to regular operation.

3. Avoid Sunlight Exposure

Another factor that can affect your refrigerator’s cooling efficiency is exposure to direct sunlight. The sun’s heat can cause the compressor to work harder than necessary. To rectify this issue, consider relocating your refrigerator to a spot where it is shielded from direct sunlight. Additionally, ensure that the air vents at the back of the refrigerator are not obstructed, as blocked vents can lead to overheating and reduced cooling performance.

4. Overloading the Fridge

An overloaded refrigerator is a common culprit for cooling problems. When you stuff your fridge with too many items, it obstructs the airflow, making it difficult for the refrigerator to cool effectively. To resolve this issue, start by removing some of the items to allow for better air circulation. Also, check the temperature setting of your refrigerator; it should ideally be set between 37 and 40 degrees Fahrenheit for optimal cooling. An excessively low or high-temperature setting can hamper the refrigerator’s performance, so make sure it’s adjusted correctly.

5. Dirty Condenser Coils

The condenser coils, located on the back of your Samsung refrigerator, play a crucial role in the cooling process. Over time, these coils can accumulate dust and dirt, hindering their ability to release heat effectively. When the coils can’t dissipate heat properly, it causes the refrigerator to struggle to maintain a cold temperature. One common reason for dirty coils is their proximity to air vents, which can blow dust and debris onto them.

To rectify this issue, follow these steps to clean the condenser coils:

  1. Unplug the refrigerator and remove the back panel to access the coils.
  2. Use a vacuum cleaner with a brush attachment to gently remove dust and dirt from the coils.
  3. If necessary, employ a coil cleaning brush designed to reach deep into the coils to remove stubborn buildup.
  4. After cleaning, replace the back panel and plug the fridge back in.
  5. Let the refrigerator run for a few hours to check if the cooling problem is resolved.

If the problem persists, it’s advisable to seek professional assistance for further diagnosis and repair.

6. Evaporator Coils Frosted Over

Frost buildup on the evaporator coils is another potential cause of cooling issues in your Samsung refrigerator. The defrost timer may be turned off or set for an extended time interval. To address this problem, refer to your owner’s manual for instructions on how to reset the defrost timer.

Evaporator Coils Frosted Over

7. Evaporator Fan Motor Issues

The evaporator fan motor plays a crucial role in distributing cold air throughout the refrigerator. If it’s not functioning correctly, your fridge won’t cool properly. A common reason for the motor’s failure is the buildup of ice and frost on the coils, which can lead to overheating and eventual burnout.

To prevent this issue, take the following precautions:

  • Ensure your fridge is adequately sealed to prevent cold air from escaping.
  • Regularly clean the coils to prevent ice and frost buildup.
  • If you notice inadequate cooling, turn off the refrigerator immediately and seek professional repair assistance.

8. Damper Control Assembly

The damper control assembly regulates the airflow inside the refrigerator. If it malfunctions, it can result in inadequate cooling. Common reasons for its failure include dirt or damage to the assembly itself or insufficient power supply to the damper.

To resolve these issues:

  • If the damper is dirty or damaged, replace it.
  • If the fridge isn’t receiving adequate power, inspect the wiring and connections.
  • Installing a new Damper Control Assembly can be done following your fridge’s manual, or seek assistance from a refrigerator repair service if needed.

9. Thermistor Troubles

The thermistor in your Samsung refrigerator is responsible for maintaining the internal temperature. When it malfunctions, it can lead to uneven cooling or prolonged cooling times after adding new items. Common reasons for thermistor failure include age, wear, and physical damage.

To address this issue, you can replace the thermistor yourself by following these steps:

  1. Disconnect the power to the fridge.
  2. Remove the back panel to access the thermistor.
  3. Unplug the old thermistor and plug in the new one.
  4. Reassemble the fridge, plug it back in, and monitor its cooling performance.

If you’re uncomfortable with DIY repairs, consider contacting Samsung’s refrigerator repair service for professional assistance.

10. Start Relay Issues

The start relay is a small but essential component in your refrigerator’s compressor system. It helps initiate the compressor’s operation by providing the initial electrical boost. A failed start relay, often due to a malfunctioning capacitor, can prevent the compressor from starting correctly, leading to cooling problems.

To address this issue:

  1. Locate the start relay, typically near the compressor, by opening the back panel.
  2. Disconnect the wires from the start relay.
  3. Use a multimeter to test for continuity. If there is none, replace the start relay.
  4. If the problem persists, investigate the compressor and Freon levels, as low Freon or compressor failure can also impact cooling.

11. Start Capacitor Troubles

The start capacitor, situated within the compressor of your Samsung refrigerator, is another critical component. When it fails, it can disrupt the compressor’s operation, leading to cooling issues. Common reasons for start capacitor failure include ageing and extended use, as well as damage from power surges or voltage spikes.

To resolve this problem:

  1. Purchase a replacement start capacitor from a hardware or home improvement store.
  2. Ensure you have the correct size and voltage rating by taking the old capacitor with you.
  3. Remove the cover from the refrigerator, locate the old capacitor, and disconnect the wires.
  4. Install the new capacitor in the exact location and reconnect the wires.
  5. Replace the refrigerator cover and your cooling problems should be resolved.

12. Temperature Control Board Malfunction

The temperature control board serves as the brain of your refrigerator, regulating the compressor and fans. When it fails, it can disrupt the cooling process. The most common cause of temperature control board failure is a power surge.

To address this issue:

  1. Purchase a replacement temperature control board from Samsung or an authorized dealer.
  2. Ensure you have the correct model for your refrigerator.
  3. Locate the temperature control board inside the fridge, typically near the back.
  4. Disconnect the power to your refrigerator.
  5. Remove the old board and replace it with the new one.
  6. Reconnect the power and test your refrigerator’s cooling performance.

Temperature Control Board Malfunction

13. Defrost Control Board Problems

The defrost control board is responsible for managing the defrost cycle of your refrigerator. If it fails, frost can accumulate on the evaporator coils, impeding proper cooling. Signs of defrost control board failure may include error codes displayed on the control board.

To address this issue:

  1. If you suspect defrost control board failure, it may need replacement, which a qualified technician best does.

14. Defrost Thermostat Troubles

The defrost thermostat, located in the freezer compartment, controls the refrigerator’s temperature. When it malfunctions, the refrigerator may not cool properly. To test the defrost thermostat:

  1. Please remove it from the freezer compartment and place it in a cup of ice water.
  2. Observe whether the thermostat turns on and off at the correct temperature.
  3. If it fails the test, replace it with a new one, ensuring it matches your refrigerator’s model.

15. Defrost Timer Issues

The defrost timer, if present in your refrigerator, can influence the cooling process by controlling how long the compressor runs. If it’s not functioning correctly, it can lead to excessive or insufficient compressor operation.

To test the defrost timer:

  1. Locate it, usually in the refrigerator near the control panel.
  2. Turn it clockwise until you hear a click.
  3. If the timer doesn’t work as expected, consider replacing it with a new one, which can be found at hardware stores or online.

16. Main Control Board Failure

The main control board serves as the central hub of your refrigerator’s operation. If it malfunctions, it can cause your fridge to stop cooling entirely. Common reasons for primary control board failure include power surges.

To address this issue:

  1. Replace the main control board with a new one, following the instructions in your owner’s manual or seek professional assistance.


When your Samsung refrigerator is not cooling correctly, it can be frustrating, but with a systematic approach, you can identify and resolve the issue. By addressing the potential causes mentioned above and following the recommended solutions, you can increase the chances of getting your refrigerator back to its optimal cooling performance.

If troubleshooting on your own proves challenging, don’t hesitate to reach out to a professional refrigerator repair service for expert assistance. Your efforts will help extend the lifespan of your refrigerator and ensure the safety and freshness of your food.


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