How to Fix / Troubleshooting

Safety first: Turn off the boiler before tightening any mechanical fixings.

Check burner mounting: Ensure all burner fixing bolts to the boiler door are tight and that the gasket is intact.
Inspect flue supports: Verify that the flue is properly supported and not vibrating against structures.
Listen to fan: If the noise is from the fan, bearings may be worn and the fan assembly should be replaced.
Combustion adjustment: Whistling or roaring can indicate incorrect gas/air ratio; a technician should perform a combustion check and adjust the Weishaupt burner.

When to call a professional: Combustion noise issues generally require a burner specialist.

Boiler is very noisy (whistling, roaring, or vibration) during burner operation.

Possible Causes