When your heat pump outdoor fan is running and blowing air, but the indoor air is not cooling, it usually indicates an issue with the refrigeration cycle or compressor operation rather than the blower fan itself. One of the most common causes is a dirty or clogged outdoor condenser coil, which prevents heat from releasing outside, or a dirty indoor air filter that restricts airflow across the evaporator coils. Another frequent culprit is a failed run capacitor, a faulty compressor contactor, or an electrical overload that prevents the outdoor compressor motor from engaging even while the fan spins. Additionally, low refrigerant levels resulting from a leak will severely impair the system's ability to absorb heat from your home. You can verify the compressor status by listening for a deep humming sound outdoors or checking if the large refrigerant line feels warm instead of cold.
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