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How can I eliminate. a whistleing noise on Vailant Boiler?

Vailant Eco Tec Vented Boiler makes whistleing sound until the burner modulates back. When the return is at operating temperature the boiler is ok at full power.
Mike Allan, September 2009
you may have a perished gaskit job for a professional

tim, September 2009
Get an RGI to Check the Combustion CO2 should be
8.8% +/- 0.1%

www.elanar.co.uk, September 2009
link Click here to see other fixes for TEC.