Refrigerator Not Cooling? Here Are the 7 Most Common Causes

Don't Panic — It's Usually Fixable

A refrigerator that's running but not cooling is one of the most stressful appliance problems because of the food spoilage risk. The good news: the majority of cooling failures have a known, fixable cause. Here are the seven most common culprits, starting with the ones you can check yourself.

1. Dirty Condenser Coils

Condenser coils release heat from the refrigerant cycle. When they're coated in dust and pet hair, the refrigerator can't shed heat efficiently and struggles to maintain temperature. On most refrigerators, the coils are located underneath the unit or on the back.

Fix: Vacuum or brush the coils every 6–12 months. This alone can restore cooling on older units.

2. Evaporator Fan Not Running

The evaporator fan circulates cold air throughout the fridge and freezer compartments. If you open the freezer and don't hear a fan running, this is a likely culprit. A common symptom: the freezer stays cold but the refrigerator section warms up.

Fix: The fan motor usually needs replacement — a straightforward repair for a certified tech.

3. Frost Build-Up on Evaporator Coils

The defrost system (heater + timer + thermostat) periodically melts frost off the evaporator coils. When this system fails, frost accumulates until airflow is completely blocked. You may notice ice visible through the back panel of the freezer.

4. Faulty Door Gaskets

A worn or cracked door seal lets warm air leak in constantly, forcing the compressor to work overtime. Check your gaskets by closing the door on a piece of paper — you should feel resistance when pulling it out. If the paper slides out easily, the seal needs replacing.

5. Refrigerant Leak

Refrigerant is the chemical compound that actually cools your food. A slow leak causes the system to gradually lose cooling capacity. Signs include: the compressor running almost constantly, warmer-than-normal temperatures, and sometimes a light hissing sound near the back of the unit.

Fix: This requires a licensed technician with EPA-certified refrigerant handling equipment. Not a DIY job.

6. Compressor Failure

The compressor is the heart of the refrigeration system. A failed compressor typically means the unit runs but produces no cooling at all. You can often hear the difference — the compressor makes a clicking sound as it tries to start, then shuts off.

Fix: Compressor replacement is a significant repair but can be worth it on premium brands (Sub-Zero, Viking, etc.) that are otherwise in good shape.

7. Start Relay Failure

The start relay is a small, inexpensive component that helps the compressor start. When it fails, the compressor can't turn on. This is often misdiagnosed as compressor failure. A good technician will check the relay first — it's a $15–40 part and a 15-minute fix.

What to Do Right Now

1. Move temperature-sensitive food to a cooler with ice
2. Check the condenser coils (quick, free DIY check)
3. Make sure the thermostat isn't accidentally set too warm
4. Call a certified technician for a proper diagnosis

Our techs carry the most common refrigerator parts on their vans, meaning most cooling repairs are resolved in a single visit.

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Published by the Turn Appliance Repair team · Serving Burbank, Glendale, Pasadena, Beverly Hills, and all of Greater Los Angeles · (818) 968‑2468