Outdoor Unit Running but No Air Inside: Fan Motor Burnt Out

• –Filter removed and inspected — clean, no restriction.
• –Blower wheel removed and checked — no significant dust accumulation, wheel was balanced and free to spin manually.
• –Motor capacitor measured — value within 5% of rated specification, capacitor not at fault.
• –Power confirmed at motor — motor did not respond. Winding test showed open circuit on one pair.

The motor needed replacement — a part swap, not a unit replacement. A matched motor was sourced and fitted on a return visit, and airflow tested normal across all fan speeds.

Full airflow returned after the motor swap — the outdoor unit, gas circuit, and PCB were all unaffected, and the unit cooled normally from that point.

Buildup vs. motor failure — different problems, different fix.

• –Buildup develops slowly over months — the motor strains, noise rises, airflow weakens bit by bit, but it never stops suddenly.
• –Motor failure is the opposite: airflow is fine one day, gone the next, and the blower wheel will not spin even when power is on.
• –Always test the motor capacitor first — it is the cheapest part that can stop the motor from starting, and a dead capacitor looks just like a burnt motor.
• –If the capacitor checks out and the motor still will not spin, a winding resistance test gives a clear answer: open circuit means the motor coil has failed.