Why Is My Fridge Running but Not Cooling?

The simplest cause and the first to rule out. Fridge temperature controls are sometimes nudged accidentally by items being loaded, by children, or by cleaning. Check the temperature dial or digital display. The fridge compartment should be set between 3°C and 5°C. A setting above 7°C will result in noticeably poor cooling without any mechanical fault.

On fridge-freezers with a single control, check that the setting applies to the fridge section and not only the freezer. Some models have a dedicated “holiday” or “eco” mode that reduces fridge cooling to save energy. Confirm the fridge is not in one of these modes if the option exists.

A damaged or poorly fitting door seal is one of the most common reasons a fridge runs continuously without cooling effectively. Warm room air enters continuously through a failed seal, and the compressor runs almost without stopping trying to compensate. The interior temperature stays above target despite constant compressor operation.

Test the seal by closing the door on a piece of paper. Pull the paper out. If it slides free without resistance, the seal compression at that point is insufficient. Run the test around the full perimeter of the door. Also inspect the rubber seal visually for cracks, tears, or sections that have pulled away from the door frame. Replacement seals are available for most models and can be fitted without specialist tools.

Cold air enters the fridge compartment through vents, usually at the rear of the interior, and circulates by convection and fan movement. If food is packed too tightly or positioned directly against the rear vent panel, cold air cannot circulate to the front and lower sections of the fridge. The area near the vents stays cool while the rest of the compartment warms.

Reorganise the contents to leave clear space around the rear and side vents. Do not push items flush against the rear wall. Ensure nothing is resting against the fan housing if one is visible. A few centimetres of clearance at the vent positions is sufficient for good circulation.

The condenser coils at the rear or base of the fridge dissipate heat removed from the interior into the surrounding air. When coils are coated in dust and debris, this heat dissipation is impaired. The refrigerant cannot release heat efficiently, and the whole cooling cycle becomes less effective. The compressor works harder but delivers less cooling.

Pull the fridge away from the wall and vacuum or brush the coils at the rear. On some models the coils are behind a panel at the base. Annual cleaning is sufficient for most households; more frequently if you have pets that shed hair. After cleaning, ensure the fridge has at least 5cm clearance at the rear and sides for ventilation.

On fridges or fridge-freezers without a frost-free system, ice can build up on the evaporator coils inside the freezer compartment to the point where airflow to the fridge section is severely restricted. The freezer stays cold but the fridge warms because the cold air cannot get through the ice blockage. This is a gradual process. A fridge that has been cooling normally for years and then progressively cools less well often has this cause.

The fix is a manual defrost: switch the appliance off, remove all food to cool bags, leave the doors open, and allow all ice to melt fully, typically four to six hours. Place towels to catch the water. Once fully defrosted, dry the interior, restart, and monitor. If the problem recurs within a few weeks, the defrost heater or thermostat (on frost-free models) may be faulty, which requires professional repair.

The evaporator fan circulates cold air from the evaporator coils through the fridge compartment. If this fan stops working, the coils continue to cool but that cold air is not distributed. The area immediately around the coils may be cold while the rest of the fridge warms. A characteristic sign is a fridge that is cold at the back near the freezer compartment but warm at the front and on the upper shelves.

Fan failure can result from ice build-up jamming the blade (manual defrost may resolve this temporarily), a failed fan motor, or a wiring fault. Once the fan blade is confirmed to be free of ice and the problem persists, the motor or its circuit requires professional diagnosis and replacement.

The thermostat monitors internal temperature and signals the compressor to run when cooling is needed. A faulty thermostat may signal the compressor to stop too early, causing the fridge to warm before the target temperature is reached, or may fail to signal it at all. A temperature sensor that returns a false reading has the same effect: the control board believes the fridge is cooler than it is and does not activate the compressor sufficiently.

The symptom pattern is a compressor that cycles on and off at unusual intervals, or that runs briefly and stops before adequate cooling is achieved. Diagnosis requires a technician with measurement equipment to test the thermostat or sensor against its specified operating range.

If the compressor is running but the fridge is not cooling at all (not just poorly, but no cold air anywhere), the refrigerant circuit may have lost charge through a leak, or the compressor itself may have failed mechanically. Both result in the motor running (audible hum) with no heat exchange taking place. The fridge interior reaches room temperature regardless of the thermostat setting.

Refrigerant recharge and compressor replacement are specialist repairs requiring F-Gas certified engineers. Both are significant jobs. Depending on the age and value of the appliance, it may be more economical to replace the unit. An engineer can advise on the repair versus replace decision after diagnosis.