Burnham
Mechanical Noise from Pump, Fan, or Burner
Boiler is very noisy, with humming, grinding, or squealing sounds
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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
Worn circulator bearings, Failing combustion fan, Loose burner mounting, Cavitation due to low inlet pressure
How to Fix / Troubleshooting
Safety first: Turn off power before touching moving parts. Keep hands and tools away from fans and belts.
- Identify noise source: Listen carefully to determine if the noise is coming from the circulator pump, combustion fan, or burner area.
- Check for air in pump: Some pumps have a vent plug; bleeding air can reduce cavitation noise. Ensure system pressure is adequate.
- Tighten mounting hardware: Verify that pumps, fans, and burner assemblies are securely mounted and not vibrating against sheet metal.
- Replace failing components: Grinding or squealing usually indicates bearing failure. A technician should replace the noisy pump or fan.
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Repair Difficulty
Medium
3/5
Required Part
Combustion Fan Assembly
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