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Mend Vaillant GB 820 Central Heating Plumbing Boiler

valliant tubomax gb 820 noise?

boiler is making high pitch noise when central heating on. The noise stops as long as the hot water tap is on.Noise goes off when the boiler is switched off and also when central heating is off.
What is the proble? How to mend it?

S Chatterjee
August 2009

Vaillant Vaillant GB 820 D.I.Y, Plumbing Central Heating Plumbing Boiler

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Vaillant GB820 Noise - High Pitch Sound