When a residential heat pump is running and the fan is blowing, but the system fails to cool your home, several common mechanical, electrical, or airflow issues could be responsible. A frequent culprit 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 coil and causes it to freeze solid into a block of ice. Another major cause is a failed run capacitor or faulty compressor contactor that prevents the outdoor compressor motor from engaging even while the fan spins. Additionally, low refrigerant levels from a leak will severely impair the system's cooling capacity. You can troubleshoot basic items by checking and replacing dirty air filters and clearing debris from around the outdoor unit. You can verify resolution when cool air resumes.
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