Armstrong Air Inducer or Blower Noise

Furnace produces a loud high-pitched whine or rumble during operation.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Worn inducer motor bearings, Loose inducer wheel, Unbalanced blower wheel, Restrictive ductwork causing resonance

How to Fix / Troubleshooting

Safety: Turn off power before touching moving parts.

Steps to check:

  • Identify noise source: Remove the blower door and carefully listen (with power on) to determine if the noise comes from the inducer (upper section) or blower (lower section). Do not touch moving parts.
  • Inspect blower wheel: With power off, check the blower wheel for debris, bent fins, or looseness on the motor shaft. Tighten the set screw if loose.
  • Check inducer assembly: Spin the inducer wheel by hand with power off. If it feels rough or wobbly, the inducer motor assembly should be replaced.
  • Call technician: Bearing or wheel replacement typically requires professional service and Armstrong Air OEM parts.
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Repair Difficulty

Hard 4/5

Required Part

Inducer Motor Assembly
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