If your air conditioner is running but blowing warm air, there are several mechanical, electrical, and airflow issues that could be causing the failure.
Top 5 Common Airflow Restrictions
- Dirty Air Filter: Restricts airflow, causing the evaporator coil to freeze and block heat transfer.
- Blocked Condenser Coils: Dirt, leaves, or dust on the outdoor unit prevent heat dissipation.
- Blocked Registers: Closed vents inside the house disrupt balanced static pressure.
- Failed Blower Motor: Fan fails to circulate air over the indoor coil.
- Crushed Ductwork: Physical collapse of flex ducts restricts cold air delivery.
Refrigeration Loop & Electrical Failures
- Low Refrigerant Charge: Caused by leaks, resulting in low suction pressure and freezing coils.
- Failed Start Capacitor: The compressor or fan motor cannot start.
- Faulty Thermostat: Fails to signal the control board to engage the contactor.
- Tripped Breaker: Electrical overload trips the main fuse.
- Compressor Valve Failure: Internal valves leak, preventing compression.