Buderus Delayed Ignition / Combustion Instability

Furnace is running but making loud booming or rumbling noises at startup

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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

Dirty burner head, Incorrect gas pressure, Misaligned ignition electrode, Excessive primary air restriction

How to Fix / Troubleshooting

Safety: Turn off power and gas. Booming ignition can damage the furnace and is a safety concern.

Steps:

  • Inspect burner: Remove the Buderus burner assembly if accessible. Clean burner ports and surfaces with a soft brush and vacuum.
  • Check ignition electrode: Verify correct gap and position per Buderus specifications. Clean any carbon buildup.
  • Air intake: Ensure combustion air openings or intake pipes are not blocked.

Gas pressure and combustion adjustments must be done by a qualified technician with proper instruments. Do not continue operating the furnace with booming ignition.

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Repair Difficulty

Professional Required 5/5

Required Part

Buderus Burner Assembly
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