Day & Night
Excessive Vibration / Duct Resonance
Furnace causes strong vibration and rumbling through the ductwork when running.
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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
Unbalanced blower wheel, loose blower mounting, flexible duct sagging, undersupported metal ducts
How to Fix / Troubleshooting
Safety first: Turn off power before accessing blower or ducts.
- Inspect blower mounting: Ensure the blower housing is securely fastened to the furnace cabinet.
- Check blower wheel balance: Look for debris stuck in the blower wheel blades and remove carefully.
- Support ducts: Add or adjust duct hangers to reduce sagging and resonance, especially on long runs.
If vibration persists, a technician may need to replace or rebalance the blower wheel.
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Repair Difficulty
Medium
3/5
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