The inducer motor (sometimes called a “draft inducer”) is a small motor on most modern furnaces that pulls combustion gases through the heat exchanger and out the venting. It runs for a few seconds before ignition (purging the system) and continues during operation to maintain proper draft.
Why it matters
The inducer motor proves draft to the pressure switch, which then allows the gas valve to open and ignition to begin. If the inducer fails or weakens, the pressure switch won’t close, ignition won’t start, and the furnace fails on a lockout fault — usually displayed via flashing LED codes on the control board.
Common inducer issues
- Bearing wear — loud whining or grinding sound
- Failed capacitor preventing startup
- Cracked motor housing leaking exhaust
- Wheel buildup from condensate corrosion (high-eff units)
Inducer motor replacement runs $450-$750 typical, including parts and labor. Most furnaces eventually need an inducer replacement once or twice over their lifespan.
Related: Furnace, Pressure Switch, Combustion Air.
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Right Way Mechanical is a family-owned HVAC contractor serving Wheat Ridge, Arvada, west Denver, and the Colorado foothills.