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I have a noisy VCW Sine TCW Vaillant Combi Boiler after bleeding the rads?

I bled 2 upstairs radiators which were cold at the top and let out quite a bit of air but having done so, the boiler now has a whining noise which I suppose is air related. Any ideas how to remove the noise. The pressure is also lower at about 0.5bar now..
chris jones, November 2007
Problem now has disappeared on its own somehow after about an hour...hoorah

chris jones, November 2007
link Click here to see other fixes for Vaillant VCW Sine TCW.