Protherm Combustion Instability / Burner Noise

Furnace produces rumbling or roaring noise 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, Blocked or partially blocked Protherm burner, Flue restriction causing backpressure, Loose burner mounting

Safety first: Turn off power and gas if noise is severe.

Step 1 – Check flue terminal: Ensure the flue outlet is not obstructed.
Step 2 – Burner cleaning: Clean the burner and check for damage or warping.
Step 3 – Tighten mounts: Verify that the burner and fan assemblies are securely fastened.
Step 4 – Technician combustion tuning: A technician should perform a combustion analysis and adjust gas settings or replace components as needed.

Hard 4/5

Main Burner Assembly

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