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whats wrong with my boiler?

Hi i haue a vokaer compact 28 combi boiler it loses presure and when i put my heating on the boiler is knocking off but its fine if ive just got hot water only on
kerry bounds, October 2011
Most common vokera problem if you are loosing pressure is the heating body corroded and leaking

bill, October 2011
link Click here to see other fixes for Vaillant Compact 28.