Miller
Blower or Inducer Bearing Wear
Furnace produces a high-pitched squealing or screeching noise 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 blower motor bearings, Failing inducer motor bearings, Loose blower wheel, Misaligned motor mount
How to Fix / Troubleshooting
Safety: Turn off power before touching moving parts. Do not run the furnace with access panels removed.
- Identify noise source: Remove the blower door and briefly run the furnace to determine if the noise comes from the main blower or the inducer. Then shut power off.
- Inspect blower assembly: Check the blower wheel for rubbing against the housing and tighten the set screw on the motor shaft. Look for play in the motor shaft indicating worn bearings.
- Inspect inducer motor: Check for wobble or grinding when spinning the inducer wheel by hand. Replace the inducer assembly if bearings are noisy or seized.
- Replace worn components: Replace the blower motor or inducer motor assembly as needed using Miller-compatible parts.
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Repair Difficulty
Medium
3/5
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