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No hot water from Biasi 24s?

I have a Biasi M93 24S boiler and the boiler does not light with the hot water. The central heating is working fine and if I turn on the central heating and the boiler fires up the water will run hot if turned on.
Paul, September 2010
Two potential points (in order)
1: Domestic flow switch
2: Diverter valve

Carefree, September 2010