How to Fix a Fridge Not Cooling: Common Causes and Solutions
A fridge that is not cooling properly is one of the most stressful appliance problems — food spoils quickly and the solution is not always obvious. Before calling a technician or buying a replacement, there are several things you can check yourself. This guide covers the most common causes of a fridge not cooling and what to do about each one.
Step 1: Check the Basics First
Before investigating further, confirm these fundamentals:
- Is the fridge plugged in and the power point switched on?
- Has the circuit breaker tripped? Check your switchboard.
- Is the temperature dial set correctly? It should be between 3°C and 5°C for the fridge and -18°C for the freezer.
- Is the door sealing properly? Check for visible gaps or damage to the door seal.
Cause 1: Dirty or Blocked Condenser Coils
The condenser coils at the back or base of the fridge release heat from the refrigerant. If coated in dust and debris, they cannot dissipate heat efficiently and the fridge struggles to maintain temperature.
Fix: Unplug the fridge and use a vacuum cleaner with a brush attachment to clean the coils. For coils at the rear, pull the fridge away from the wall first. Do this every 12 months as preventive maintenance.
Cause 2: Faulty Door Seal (Gasket)
A worn or damaged door seal allows warm air to constantly infiltrate the fridge, forcing the compressor to run more than designed and still not maintaining temperature.
Test: Close the door on a piece of paper. If you can pull the paper out easily without resistance, the seal is failing.
Fix: Replacement door gaskets are available from appliance parts suppliers. This is a DIY repair for most models — the gasket pushes or clips into the door channel. A new seal can dramatically improve cooling performance.
Cause 3: Overpacking the Fridge
Fridges need airflow to maintain even temperature. Overpacking blocks the vents and prevents cold air from circulating properly.
Fix: Remove items blocking the internal air vents (usually at the back wall of the fridge compartment). Allow at least 2–3cm clearance between items and vents.
Cause 4: Fridge Too Close to the Wall or Heat Sources
Fridges need space behind and above them for the condenser to dissipate heat. If pushed hard against a wall or positioned next to an oven or in direct sunlight, they will struggle to cool.
Fix: Allow at least 5cm clearance behind and 10cm above the fridge. Move it away from direct heat sources.
Cause 5: Faulty Evaporator Fan
The evaporator fan circulates cold air from the evaporator coils throughout the fridge and freezer. If this fan fails, the fridge may not cool even though the compressor is running.
Symptom: You can hear the compressor running but the fridge interior is warm. Open the freezer — if the freezer is very cold but the fridge is warm, the problem is often the evaporator fan or a blocked vent between freezer and fridge.
Fix: This repair requires a technician to access and replace the fan motor.
Cause 6: Iced-Over Evaporator (Frost-Free Failure)
In No Frost fridges, a heater periodically defrosts the evaporator coils. If the defrost heater or timer fails, ice builds up on the evaporator until airflow is completely blocked.
Symptom: Both fridge and freezer lose cooling gradually over days or weeks.
Fix: Manual defrost by unplugging the fridge for 24–48 hours with both doors open. If cooling resumes after defrosting but the problem returns within weeks, the defrost system component has failed and needs professional repair.
Cause 7: Low Refrigerant (Gas Leak)
Refrigerant leaks are less common but do occur. If the fridge is running but not cold at all, and other causes have been eliminated, a refrigerant leak is possible.
Symptom: Fridge runs constantly, compressor feels hot, no cold at all in either compartment.
Fix: This requires a licensed refrigeration technician — refrigerant is a controlled substance and cannot be DIY-handled. Repair costs can be significant; for older fridges it may be more economical to replace.
When to Repair vs Replace
If your fridge is more than 10 years old and requires a major repair (compressor, refrigerant, sealed system), replacement is often more economical. A new fridge also brings improved energy efficiency — savings of $80–$150 per year on electricity compared to a 10-year-old model.
Looking for a Replacement Fridge?
Oceania Appliances stocks top-brand fridges in every size and style. Free delivery across Sydney. Visit 2/14 Centre Place, Wetherill Park, call or WhatsApp 0422 489 492, or email support@oceaniaappliances.com.au.