There are several reasons why your refrigerator may not be cooling effectively. The most common causes include a faulty compressor, clogged condenser coils, a malfunctioning evaporator fan, or a thermostat issue. Dirty condenser coils can reduce cooling efficiency, so regular cleaning is recommended. If your refrigerator is running but not cooling, it’s essential to check the airflow inside the fridge and ensure the vents are not blocked by food. If troubleshooting doesn’t resolve the issue, it may require professional refrigerator repair service.