A refrigerator is an essential appliance for both home and commercial purposes. It is critical in keeping food fresh and preventing spoilage. When it stops cooling properly, it can cause inconvenience and potential food wastage. At ARC Center, we specialize in diagnosing and repairing fridge faults, ensuring your fridge runs efficiently. Below are some of the common reasons why a fridge may not be cooling properly and how to diagnose these faults effectively.
1. Dirty Condenser Coils
Condenser coils release heat from the refrigerator. When these coils are covered in dust, dirt, or pet hair, they cannot dissipate heat efficiently, leading to poor cooling. To diagnose this issue, inspect the coils at the back or bottom of the fridge. If they appear dirty, clean them using a vacuum or coil brush. Regular maintenance helps improve cooling performance and energy efficiency.
2. Faulty Thermostat
The thermostat regulates the temperature inside the fridge. If it malfunctions, the fridge may not cool properly or could cool excessively. To test this, turn the temperature dial and listen for a click indicating activation. If the fridge does not respond, use a multimeter to check for continuity. A faulty thermostat should be replaced to restore proper cooling.
3. Blocked or Faulty Evaporator Fan
The evaporator fan circulates cold air throughout the fridge. If the fan is not running, cold air will not reach all compartments, causing uneven cooling. Check if the fan is obstructed by ice or debris. If the blades do not spin freely or the motor makes unusual noises, the fan may need replacement.
4. Defective Condenser Fan
The condenser fan helps cool the compressor and condenser coils. If this fan stops working, the fridge may overheat and fail to cool. Inspect the fan for blockages and ensure it spins freely. If it does not run when the fridge is on, test the fan motor with a multimeter. A malfunctioning fan should be replaced to prevent overheating.
5. Low Refrigerant Levels
Refrigerant is essential for the cooling cycle. A leak in the refrigerant system can reduce cooling efficiency. Symptoms include a fridge running constantly but not cooling effectively. Diagnosing refrigerant issues requires a professional technician, as handling refrigerants requires specialized equipment. If you suspect a leak, contact an expert for repair.
6. Malfunctioning Compressor
The compressor is the heart of the fridge’s cooling system. If it fails, the fridge will not cool properly. Signs of a failing compressor include unusual noises, overheating, or the fridge not turning on. Use a multimeter to check the compressor’s electrical continuity. If the compressor is faulty, it will need to be replaced by a professional.
7. Faulty Start Relay or Capacitor
The start relay and capacitor help the compressor start and run efficiently. If these components fail, the compressor may not start at all, leading to a warm fridge. You may hear a clicking sound every few minutes as the compressor attempts to start. Test the start relay with a multimeter and replace it if necessary.
8. Defective Defrost System
A fridge’s defrost system prevents excessive ice buildup on the evaporator coils. If the defrost heater, defrost timer, or defrost thermostat fails, ice can accumulate and block airflow, reducing cooling efficiency. Check for excessive frost buildup on the evaporator coils. If the defrost system components do not function, they will need replacement.
9. Blocked Air Vents
Cold air must circulate freely throughout the fridge. Blocked air vents, caused by overloading shelves or ice buildup, can restrict airflow and lead to cooling issues. Ensure vents are clear and not obstructed by food items or ice. Proper organization inside the fridge helps maintain efficient cooling.
10. Damaged Door Seal (Gasket)
A damaged or worn-out door gasket allows warm air to enter the fridge, making it harder to maintain the desired temperature. Check the gasket for cracks, warping, or looseness. Perform the paper test by placing a sheet of paper in the door seal and closing the door—if the paper slides out easily, the seal is faulty and should be replaced.
11. Power Supply Issues
Voltage fluctuations or a faulty power cord can affect the fridge’s performance. Ensure the fridge is properly plugged into a working outlet. Check for blown fuses or tripped circuit breakers. If the fridge does not turn on, inspect the power cord for damage. Using a voltage stabilizer can help protect the appliance from power surges.
12. Control Board Failure
Modern refrigerators rely on electronic control boards to regulate temperature and operation. A malfunctioning control board can disrupt cooling cycles or cause erratic behavior. Check for visible burn marks or damage on the board. If the fridge is not responding to adjustments or is displaying error codes, replacing the control board may be necessary.
Get Expert Fridge / Refrigeration Repair Service
At ARC Center, we specialize in both onsite diagnosis and workshop testing to ensure accurate assessment and cost estimation. Once we have identified the fault, we provide an estimated cost for client approval before proceeding with repairs.
For professional assistance with repairing or servicing your Defy, Samsung, Bosch, Russel Hobbs, LG, Smeg, Whirlpool, or AEG fridge, contact us at:
📍 Cape Town: 063 617 6968
📍 Randburg (Johannesburg & Pretoria): 079 232 8681
Let ARC Center help you restore your fridge to optimal working condition! Here are some additional resources that can relate to your fridge:
