Sime
Combustion Noise / Fan Noise
Furnace is very noisy during operation, with rumbling, whistling, or droning sounds from the burner or fan.
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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
Incorrect gas/air ratio, Dirty burner, Worn fan bearings, Loose mounting screws
How to Fix / Troubleshooting
Safety first: Turn off power and gas before opening the combustion chamber.
- Tighten fixings: Check that the fan, burner, and casing screws are tight. Loose panels can resonate and amplify noise.
- Clean burner and fan: Gently brush dust from the burner and fan wheel. Avoid bending burner ports.
- Check flue supports: Ensure the flue is properly supported and not vibrating against the building structure.
- Combustion adjustment (technician): If noise persists, a Sime technician should check combustion with an analyzer and adjust the gas valve or replace the fan if bearings are worn.
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Repair Difficulty
Hard
4/5
Required Part
Flue Fan Assembly / Burner
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