Dettson
Blower or Inducer Mechanical Noise
Dettson furnace produces a high-pitched whine or squeal 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, Debris in inducer wheel, Loose blower wheel on shaft, Misaligned motor mounts
How to Fix / Troubleshooting
Safety first: Turn off power before touching moving parts.
- 1. 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 (only if safe and panels can be bypassed per manual).
- 2. Inspect blower wheel: With power off, spin the blower wheel by hand. Listen for scraping or grinding. Tighten the set screw on the motor shaft if loose.
- 3. Check inducer wheel: Remove the inducer cover and inspect for debris or rubbing. Clean as needed.
- 4. Replace noisy motor: If bearings are worn (squeal persists), replace the blower or inducer motor assembly with the correct Dettson part.
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Repair Difficulty
Medium
3/5
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