Refrigerator Running But Not Cooling? Diagnose It Before Calling Repair
Your fridge hums but food is getting warm. Here is how to diagnose the problem yourself and decide if you need a technician.
Still stuck after this guide? You can ask an HVAC technician online — see pricing, expert credentials and common questions first.
Start With the Simple Checks
Before assuming a major repair, check these basic things. Is the temperature dial accidentally turned down or off? Is the fridge too full, blocking the air vents between the freezer and refrigerator compartments? Are the door seals intact — close the door on a dollar bill and try to pull it out. If it slides out easily, the seal is worn and warm air is leaking in. Is the fridge pushed too close to the wall, blocking airflow around the condenser coils? Pull it out 2 to 3 inches from the wall.
Clean the Condenser Coils
Dirty condenser coils are the number one cause of a fridge that runs constantly but does not cool properly. These coils dissipate heat and are located either on the back of the fridge or underneath behind a kick plate. Over time, they collect dust, pet hair, and debris which insulates them and prevents heat dissipation. Unplug the fridge, locate the coils, and clean them with a coil brush (about 10 dollars) or a vacuum with a crevice attachment. This alone fixes about 25 percent of cooling problems and should be done every 6 to 12 months.
Check the Evaporator Fan
The evaporator fan circulates cold air from the freezer into the refrigerator compartment. If this fan fails, the freezer stays cold but the fridge gets warm. Open the freezer and listen for the fan. If you do not hear it running, or if it makes grinding or squealing noises, the fan motor needs replacement. Access it by removing the rear panel inside the freezer. A replacement fan motor costs 15 to 40 dollars.
Defrost System Failure
If you see heavy frost or ice buildup on the back wall of the freezer, the automatic defrost system has failed. This ice blocks airflow and prevents cooling. The defrost system has three components: a defrost heater, defrost thermostat, and defrost timer or control board. You can force a manual defrost by unplugging the fridge for 24 hours with the doors open and towels on the floor. If it cools normally after defrosting, the defrost system needs repair. A defrost heater or thermostat costs 20 to 40 dollars.
When It Is the Compressor
If the condenser coils are clean, the evaporator fan works, and there is no frost buildup, the compressor may be failing. A failing compressor often makes clicking, buzzing, or humming sounds and the fridge does not cool at all. Compressor replacement costs 400 to 800 dollars with labor. At that price, if your fridge is more than 10 years old, replacement is usually more cost-effective than repair. If the fridge is under 5 years old, check if the compressor is still under manufacturer warranty — many brands offer 5 to 10 year compressor warranties.
