How do you know when you need a new blower motor?

Recognizing that you need to replace your residential indoor air handler blower motor involves observing distinct physical, acoustic, and operational failure symptoms throughout your home. Key warning signs include a complete lack of airflow from your indoor supply vents even when the outdoor compressor runs, loud screeching, grinding, or squealing noises indicating worn-out motor bearings, and a burning electrical odor from overheated motor windings. You may also notice that your indoor circuit breaker trips repeatedly whenever the blower attempts to start, or that the blower motor hums loudly without spinning. You can troubleshoot by turning off power and attempting to spin the blower wheel by hand to check for seized bearings. You can verify that a new blower motor is required when electrical testing confirms open windings or internal shorts.