Samsung Refrigerator Isn’t Cooling

If your Samsung refrigerator isn’t cooling properly, there are several diagnostic steps and troubleshooting procedures you can perform to identify and potentially resolve the issue.

Test Mode

For refrigerators with no cooling, it is important to first check the temperature status of the fridge and freezer. When the display is blank, pressing any command can wake up the display. If “0 FF” appears, the unit is in demo mode with no cooling. To deactivate the demo mode, press the energy saver and freezer buttons simultaneously. Newer late models require pressing three fingers on the top two left and top one right buttons simultaneously. After deactivating the demo mode, check the target and actual temperatures of both the fridge and freezer. If necessary, place the fridge in diagnostic mode by pressing specific buttons for approximately eight seconds, noting any errors present as displayed by a blank screen.

Forced Defrosting

To force the compressor to maximum RPM, place the unit in force mode by pressing specific buttons until the screen goes blank, then pressing any button to force the compressor to maximum RPM. Measure the voltage at the inverter to ensure it is at the correct level when the fridge calls for compressor operation. Physically check the compressor to see if it is running or warm, and inspect the dryer for any signs of refrigerant flow. Use a clamp on ammeter on the inverter AC line to verify the compressor’s performance.

Troubleshooting Steps

  • Check the AC in supply voltage at the inverter PCB to ensure it measures approximately 120 volts AC.
  • Check the freezer defrost sensor circuit voltage to determine how cold the evaporator is operating.
  • Use the service manual chart to verify voltage and corresponding temperature.
  • Check the freezer evaporator for frost formation on the tubing and fins.
  • Measure the current on the red wire at the filter area of the power connector using a clamp meter.
  • Verify if the sealed system, compressor, or refrigerant flow is causing the cooling problem.

Motor Module and Control Board

For motor module issues, check for power to the motor and module. If the motor isn’t spinning, verify the line voltage and visually inspect the module’s components for any signs of damage or burning. Similarly, a failed control board or thermostat face can also cause cooling issues. Test the motor and control board to ensure they are functioning properly.

Thermal Safety Switches

Inspect the thermal safety switches and limit sensors to ensure they are functioning correctly. Test the resistance values and voltage across the switches to determine if they are open or closed based on the temperature conditions.

Switching Relays

For switching relays, verify the resistance values and test the relays to ensure they are opening and closing the contacts as expected.


In conclusion, troubleshooting a Samsung refrigerator that isn’t cooling involves a series of diagnostic steps to identify potential issues with components such as the compressor, evaporator, control board, and thermal safety switches. By following these steps, you can effectively diagnose and potentially resolve the cooling problem with your Samsung refrigerator.

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