When your heating, ventilation, and air conditioning system runs continuously but fails to blow any air through the supply vents, the malfunction is usually caused by a severely restricted airflow blockage, a frozen indoor coil, or a blower motor failure. The most frequent culprit is a heavily clogged air filter that completely chokes the blower fan, preventing air from circulating. Another common cause is an indoor evaporator coil that has frozen solid into a block of ice due to low refrigerant or restricted intake, stopping air movement. Additionally, a tripped circuit breaker, a burnt-out blower motor, or a snapped blower belt can cause fan failure. You can troubleshoot by inspecting your filter and checking for ice. You can verify that normal operation is restored when replacing filters, thawing coils, or repairing the motor returns powerful airflow.
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