IntermediateRefrigerator

Refrigerator Not Cooling? Here's How to Diagnose It

12 min readPublished March 1, 2024

A refrigerator that's not cooling properly can have several causes. This guide walks through the most common reasons and how to check each one.

Common Causes of a Refrigerator Not Cooling

**Evaporator coils are frozen over** — Most common cause in frost-free fridges

**Evaporator fan not running** — Prevents cold air from circulating

**Condenser coils are dirty** — Reduces heat dissipation

**Compressor issue** — Less common, more expensive

**Refrigerant leak** — Requires professional service

Step 1: Listen for the Evaporator Fan

Open the freezer. You should hear a fan running. If not, the evaporator fan motor may have failed or the coils may be frozen.

Step 2: Check for Frost Buildup on the Freezer Coils

Remove the back panel inside the freezer. If you see heavy frost or a solid block of ice on the evaporator coils, you have a defrost system failure.

Manual Defrost Test

Unplug the refrigerator for 24-48 hours with doors open and towels on the floor. If it cools normally afterward, the defrost system (heater, thermostat, or control board timer) needs repair.

Step 3: Clean the Condenser Coils

Located behind the lower grille (front or back). Use a coil brush or vacuum. Dirty coils are a very common cause of poor cooling performance.

Step 4: Check Door Seals

Close the door on a dollar bill. If it pulls out easily, the gasket is worn and leaking cold air.

Step 5: Test the Evaporator Fan Motor

Unplug the fridge. Manually spin the fan blade. If it's stiff or won't spin freely, replace the motor.