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vaillant combi boiler

Postby waterman » Sun Dec 18, 2011 5:49 pm

hi all i have a vaillant 831 ecotec plus condensing combi, fitted august 2008,now and then it makes a loud buzzing noise like a very large bee is inside the boiler,but when i open hot water tap for a second or two it stops.any ideas to remody this would be appreciated.thanks.
waterman
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