If it's your house and you're not the landlord of tennants in the property you are not prevented from tinkering with your boiler yourself - some of the the registered guys may say otherwise and vaguely quote this and that regulation and stress the potential dangers - they might be right about the potential for danger but the "regs" only apply to landlords and people being paid to do gas work - not to householders.
I would call in an engineer and observe him closely.
Good luck...
Peccavi
May 2009
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