how can i get my sime 80 friendly format to ignite?

how can i get my sime 80 friendly format to ignite . I am quite familiar with parts of the boiler but it just won,t ignite for dhw or ch?
john mcnally, April 2005


done
i,ve done some investigation and the fan isn,t running and when i turn the hot tap on the pressure guage goes up slightly???? this isn,t suppose to happen is it????
any help would be greatly appreciated

john mcnally, April 2005
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