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Problem with DHW going hot then cold on Modena 102?

I have a problem with my hot water going hot then cold, particularly when shower on.

If I remove internal chamber cover, then run water everything works.

Any ideas ?
Martin, January 2009
try cleaning the fan venturi the smallest amount of dust/spider web will cause this but beware when you remove it from the fan they normally fall apart and i think a new fan will be required

jim, February 2009