How to Fix / Troubleshooting

Safety first: Combustion adjustments must be performed by a qualified technician.

Check for loose panels: Ensure all casing panels are securely fastened; loose panels can vibrate and amplify noise.
Inspect fan: Listen near the fan area. Grinding or rumbling suggests worn bearings and the fan should be replaced.
Burner inspection: A technician should remove and inspect the burner for damage or contamination and clean or replace it.
Combustion tuning: Have a professional perform flue gas analysis and adjust gas/air settings to eliminate whistling or roaring.
Flue supports: Ensure the flue is properly supported to prevent vibration and resonance.

Furnace is very noisy during operation (whistling, roaring, or droning sound)

Possible Causes