How to test if your blower motor is bad?

Testing whether a residential indoor air handler blower motor is bad requires using a digital multimeter to check electrical continuity, winding resistance, and capacitor status. First, turn off all electrical power to the air handler at your main breaker panel for safety, and remove the access panel. Inspect the motor visually for burned wires or a cracked housing. Second, try spinning the blower wheel by hand; if it binds or feels stiff, the bearings are seized. Third, disconnect the motor wires and use a digital multimeter set to ohms to test winding resistance against manufacturer specifications and check for shorts to ground. Fourth, test the run capacitor. You can verify that the blower motor is bad when electrical testing confirms open windings, internal shorts, or seized mechanical bearings, indicating that full motor replacement is required.