Rinnai Abnormal Combustion Noise

Boiler or flue emits unusual rumbling, roaring, or whistling noises during operation.

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.

Possible Causes

Incorrect gas/air ratio, Partially blocked burner, Loose burner components, Resonance in flue system

Safety first: If you hear loud or explosive noises, turn off power and gas immediately and do not use the boiler.

Inspect flue and intake: Check for obstructions or loose joints that could cause resonance or whistling.
Listen at different outputs: Note whether noise occurs at low, medium, or high fire to help a technician diagnose.
Professional combustion check: A Rinnai-trained technician should inspect the burner, clean if necessary, and perform combustion analysis and gas valve adjustments.

Professional Required 5/5

Burner Assembly

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