Blower Motor
Updated
The blower motor drives the fan that moves air through your whole system: across the heat exchanger in heating, across the indoor coil in cooling, and out through the ducts either way.
Older furnaces use single-speed PSC motors that are either on or off; newer equipment uses variable-speed ECM motors that ramp up and down, run quieter, and use less electricity. When a blower motor struggles you notice it fast: weak airflow at the vents, humming without spinning, or a furnace that heats up and then shuts itself down for lack of air movement. Dirty filters and high static pressure shorten a blower's life.
Common Questions
What does the blower motor do?
The blower motor spins the fan that pushes air across the heat exchanger or cooling coil and out through the ducts to your rooms. Heating and cooling both depend on it. The equipment can make hot or cold all day, but the blower is what delivers it.
What are the signs of a failing blower motor?
Weak airflow at the vents, a hum or squeal from the cabinet, a motor that is hot to the touch, or a furnace that fires up and then shuts down on its overheat safety all point at the blower. A furnace repair visit pins down whether it is the motor, its capacitor, or the control board.
What wears out a blower motor early?
Restriction is the usual culprit. A clogged air filter, undersized ducts, or too many closed vents all force the motor to work against pressure it was not sized for, and years of that show up as bearings and windings giving out ahead of schedule.
Related Terms
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