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Hot Water problem?

Ferolli Moderna 80E Combi boiler

CH works fine. HW is hot for the first 10 seconds or so but then goes luke-warm to cold. The temperature adjustment dial is set to max and the boiler appears to fire up OK.

The gas valve was replaced recently as the boiler wasn't lighting at all.

Any ideas?
Rob, March 2006
it seems like diverter valve

bob, April 2006