GG asked ... Fix food processor motor?    |    T asked ... How do I turn the delay off on Electrolux DX302 dishwasher?    |    Helen asked ... How can I mend my Kenwood Gourmet FP505?    |    Roy Turner asked ... Kohlangaz Gosford HE fire?    |    Peter asked ... How can I mend a Powerwasher PRO PRO1800PWE?    |    Click here to ask your question

Why is my Vaillant ecoMAX828 so noisy?

The boiler works fine when firing up for central heating, and also for medium demand hot water. However, when I turn the water up full a loud vibration starts, but ceases again when the flow is reduced. It has a new fan and diverter valve fitted, and has been flushed through, but the fault persists. The gas engineer is stumped, as are the technical advisers at Vaillant, it seems. The bill is mounting up and a solution seems no nearer. Any advice would be gratefully received!
Bernie Godden, April 2010
link Click here to see other fixes for Vaillant.