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Re: Loud knocking noise in Vaillant combi boiler VCW-sine 18 T3 WF H


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Posted by Jason Mattern on November 17, 2005 at 15:29:13:

In Reply to: Re: Loud knocking noise in Vaillant combi boiler VCW-sine 18 T3 WF H posted by barney on October 21, 2004 at 05:45:45:

I have a similiar problem right now. Mine is water system. When it kicks on, there is no noise until the water begins to heat up. From there a knocking sounds occurs until the boiler cools down. Some have suggested that the water inside the boiler is boiling due to scales or calcium. But I recently had the system drained and refilled with a cleaner designed to break up scaling. This has not solved the problem as within a week, the noise has reoccured. Any ideas???


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