If your Samsung RF28R7351SR refrigerator is not cooling properly, food may spoil, the freezer may feel warm, or one section may cool while another section stays too warm. You may also notice weak airflow, frost buildup, unusual fan noise, or temperature readings that do not match the actual cabinet temperature. Common causes include blocked vents, dirty condenser coils, a failed evaporator fan motor, a faulty temperature sensor, defrost system failure, door gasket leaks, or control board problems.

This guide explains how the refrigerator cooling system works, how to identify likely causes, and how to inspect the parts that most often affect cooling on the Samsung RF28R7351SR. Start with basic airflow and setting checks before replacing parts. Always confirm the complete model number, such as RF28R7351SR/AA, and the production version before ordering fan motors, sensors, heaters, or electronic components.

How Does the Refrigerator Cooling System Work?

The refrigerator uses a sealed refrigeration system to remove heat from the cabinet. The compressor moves refrigerant through the condenser coils, where heat is released. The refrigerant then moves through the evaporator area, where it absorbs heat from the freezer and fresh food compartments. Fans move cold air across the evaporator and circulate that air through vents inside the refrigerator.

Temperature sensors report cabinet and evaporator temperatures to the electronic control board. The board turns the compressor, fans, and defrost system on and off based on those readings. During normal operation, the defrost heater melts frost from the evaporator coil so air can keep moving. If the fan stops, the sensor misreads temperature, or frost blocks the evaporator, the refrigerator may run but fail to cool properly.

Common Causes of a Samsung RF28R7351SR Refrigerator Not Cooling

• Temperature settings too warm or changed by mistake

• Blocked air vents from food containers, ice, or overloading

• Dirty condenser coils reducing heat release

• Evaporator fan motor failure or fan blade obstruction

• Frost buildup on the evaporator coil caused by defrost system issues

• Faulty temperature sensor or evaporator sensor sending incorrect readings

• Door gasket leak allowing warm air into the cabinet

• Condenser fan, compressor, sealed system, or control board issue

Tools and Materials Needed

• Phillips screwdriver

• Flathead screwdriver or plastic trim tool

• Nut driver set

• Work gloves

• Towels for melted frost or condensation

• Cooler for safely storing food during repair

• Vacuum or coil brush

• Multimeter for testing sensors and motor circuits

• Replacement evaporator fan motor, if faulty

• Replacement temperature sensor, if faulty

• Replacement defrost heater or related defrost part, if faulty

Safety Precautions

• Unplug the refrigerator before removing panels or touching wiring.

• Move perishable food to a cooler if the refrigerator will be powered off for an extended time.

• Do not use sharp tools to chip ice from the evaporator cover or coil.

• Turn off the water supply if moving the refrigerator enough to stress water lines.

• Do not attempt sealed system, refrigerant, or compressor repairs without a qualified technician.

• Wear gloves when handling sheet metal panels, fan housings, or evaporator covers.

Step-by-Step Troubleshooting for RF28R7351SR Not Cooling

1. Check temperature settings. Set the refrigerator near 37°F and the freezer near 0°F. Use Power Cool or Power Freeze only as a temporary recovery feature, not as a permanent fix. After changing settings, allow up to 24 hours for temperatures to stabilize. Use a separate refrigerator thermometer if the display temperature does not seem accurate.

2. Confirm power and door sealing. Make sure the refrigerator is plugged in and the outlet has power. Check that all doors and drawers close fully. Inspect the door gaskets for dirt, tears, or gaps. Clean gasket surfaces with mild soap and water, then dry them thoroughly. A poor seal can let warm, humid air enter and cause frost or weak cooling.

3. Inspect air vents and loading. Move food packages away from internal air vents. Avoid overloading shelves or blocking rear wall airflow paths. Check for ice buildup around vents or inside the freezer. If one compartment is cold and another is warm, airflow restriction or fan failure is likely. Leave space around stored items so cold air can circulate.

4. Clean the condenser coils. Unplug the refrigerator and pull it away from the wall carefully. Use a vacuum or coil brush to remove dust from the condenser area. Make sure the refrigerator has enough space around it for ventilation. Dirty coils can make the compressor run harder and reduce cooling efficiency.

5. Listen for the evaporator fan. Open the freezer or fresh food section and listen for fan operation after pressing the door switch. A working evaporator fan circulates cold air through the cabinet. If the fan is noisy, scraping, or not running, the blade may be blocked by ice or the motor may be faulty. Unplug the refrigerator before removing the evaporator cover and inspect the blade for debris or resistance when turning it by hand.

6. Inspect for frost buildup. Remove the interior cover only after power is disconnected and food is protected. Look for heavy frost on the evaporator cover or coil area. Heavy frost can block airflow even if the fan motor still works. Let frost melt naturally or use safe warm air at a distance. Do not puncture the evaporator coil. If frost returns quickly, test the defrost heater, defrost sensor, wiring, and control board.

7. Test the temperature sensor. Locate the refrigerator or evaporator temperature sensor using the service diagram for your model version. Disconnect the sensor from the harness before testing. Use a multimeter to check resistance according to service specifications. A sensor that is open, shorted, physically damaged, or unstable should be replaced. A faulty sensor can cause the control board to stop cooling too early or run defrost at the wrong time.

8. Replace the evaporator fan motor if faulty. Disconnect power and remove the necessary shelves, drawers, and rear interior panel. Take a photo of the wire routing before removing the old fan motor. Disconnect the fan harness, remove the mounting screws or clips, and install the replacement motor in the same orientation. Reconnect wiring and make sure the fan blade spins freely before reassembling the cover.

9. Reassemble and test cooling. Reinstall all covers, shelves, drawers, and panels. Plug the refrigerator back in and set temperatures to 37°F for the refrigerator and 0°F for the freezer. Allow up to 24 hours for temperatures to stabilize. Check airflow, fan sound, frost pattern, and actual cabinet temperatures before ordering additional parts.

Troubleshooting Tips

• Freezer cold but refrigerator warm: Check air vents, damper operation, and evaporator fan airflow.

• Both sections warm: Check power, condenser coils, condenser fan, compressor operation, and the control board.

• Fan noisy or scraping: Look for ice buildup around the fan blade or a failing fan motor.

• Frost returns after manual defrost: Test the defrost heater, defrost sensor, and control board.

• Display says cold but food is warm: Verify temperature with an external thermometer and inspect the sensor.

• Cooling stops after repeated resets: Do not rely on resets. Diagnose the part or airflow problem directly.

Replacement Part Guide

For the Samsung RF28R7351SR refrigerator, part compatibility depends on the complete model number and version. Common cooling-related parts include:

Always verify parts using the full model number RF28R7351SR/AA and the production version on the rating label. Some parts may have manufacturer substitutions or alternate numbers depending on the diagram source.

Maintenance Tips to Prevent Cooling Issues

• Keep refrigerator and freezer vents open and clear of food packages.

• Clean condenser coils regularly, especially in dusty homes or homes with pets.

• Do not overload shelves or drawers because this can block air circulation.

• Check door gaskets for dirt, cracks, or weak sealing.

• Allow warm leftovers to cool before placing large containers inside the refrigerator.

• Replace water filters on schedule if water and ice performance is also weak.

• Investigate fan noise or frost buildup early before cooling performance drops.