Peerless Sooting / Incomplete Combustion

Boiler cabinet or flue area shows signs of soot or black staining

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

Insufficient combustion air, blocked heat exchanger, incorrect gas pressure, misaligned burner

Safety first: Turn off power and gas. Sooting can indicate dangerous carbon monoxide production.

Steps:

Inspect combustion air: Ensure air openings or intake piping are clear.
Clean heat exchanger: Remove burner and clean heat exchanger surfaces per Peerless manual.
Check venting: Verify vent is not blocked and is properly sized.
Professional combustion test: Have a technician perform a full combustion analysis and adjust gas pressure and air settings.

Professional Required 5/5

Heat exchanger

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