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

• •Concern: Worry was that the whole indoor unit or the entire system would need to be replaced
• •Key check: Motor capacitor tested within spec, motor still did not spin when powered, winding resistance showed open circuit confirming motor failure

We worked from the simplest possible causes outward before concluding the motor itself had failed.

• •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 indoor fan motor coil had burnt out. Power reached the motor but produced nothing, and the winding test confirmed an open circuit. No external part was responsible.

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.