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I have a saunier duval sd623 combi, I have no hot water or heating?

I have a saunier duval sd 623 combi, I have no hot water or heating.
When I turn a tap on the second(main) heating flame does not kick in, so I presume the boiler is lacking some pressure change, can somebody tell me how to fix this problem?
I have read a few of the responses recently asked about these boilers, but still very confused, does anybody have a drawing diagram for one of these boilers?

Phil
March 2007
Saunier DuvalSaunier Duval SD623Heating, Home Heating SystemsBoiler Heating Combi
Possible vacuum switch or water pressure

alan
May 2007

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Saunier Duval SD623: No Hot Water or Heating