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Furnace Inducer motor not working: Troubleshooting Guide


Furnace Inducer motor not working: Troubleshooting Guide


Inducer motors are critical components in your furnace, responsible for expelling harmful gases and ensuring the safe operation of your heating system. When faced with inducer motor issues, it's crucial to address them promptly and accurately to restore your furnace's functionality and maintain a warm and comfortable home. In this comprehensive guide, we will walk you through troubleshooting common inducer motor problems and guide you on how to install a new inducer motor with precision and confidence.

Troubleshooting Inducer Motors

  1. Identify Common Issues:
    • Unusual noises during operation.
    • Failure of the motor to start.
    • Furnace not igniting or maintaining proper combustion.
  2. Check Power Supply:
    • Inspect electrical connections, fuses, and circuit breakers associated with the motor.
    • Replace or reset damaged components.
  3. Inspect for Mechanical Obstructions:
    • Thoroughly examine the inducer motor and its vicinity for debris or physical obstructions.
    • Clean or remove any buildup to restore smooth airflow.
  4. Lubrication and Bearing Maintenance:
    • Refer to the manufacturer's guidelines for proper lubrication of the motor's bearings.
    • Ensure bearings are well-greased to prevent friction-related issues.
  5. Test the Pressure Switch:
    • Use a multimeter to check the switch's continuity and functionality.
    • Replace it with a compatible part if it fails the test.
  6. Verify the Venting System:
    • Inspect vent pipes for blockages or damage.
    • Clear out debris and ensure proper sealing.
  7. Assess the Inducer Motor Capacitor:
    • Test the capacitor using a multimeter.
    • Replace if readings are outside the acceptable range.
  8. Check Control Board and Wiring:
    • Inspect for damage or loose connections in the control board and wiring.
    • Reattach any disconnected wires and replace damaged components.

Installing a New Inducer Motor

  1. Safety First:
    • Turn off the power to your furnace at the main electrical panel.
  2. Remove the Old Inducer Motor:
    • Disconnect electrical wires and any mounting brackets securing the motor.
    • Carefully detach the motor from the furnace.
  3. Install the New Inducer Motor:
    • Position the new motor in place and secure it with mounting brackets.
    • Reconnect electrical wires following the manufacturer's wiring diagram.
  4. Reassemble the Furnace:
    • Ensure all components are properly reinstalled and secured.
  5. Test the Furnace:
    • Turn on the power and test the furnace to verify the inducer motor's functionality.


Troubleshooting and installing an inducer motor in your furnace require careful attention to detail and a commitment to safety. By following this comprehensive guide, you can confidently address common inducer motor issues and replace a faulty motor with precision. Regular maintenance and timely repairs are vital to ensure your furnace operates efficiently, keeping your home warm and comfortable throughout the colder seasons. If you encounter complex issues or are uncomfortable with any installation steps, it's best to seek assistance from a licensed HVAC technician to ensure optimal performance and safety.