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Dear sir, you are explaining a complex system here. Whilst nothing is impossible but please take my advice: you have stated that a plumber has already let you down and more are shying away.... What does that tell you? problems.When you get this system up and running make sure that you do not...

hello jim, It seems that either the stainless steel heat exchanger is blocked (but some boilers do not have them) or the gas pressure need to be set right. You might also need the fan/air pressure switch to be looked at. If your boiler does have a heat exchanger cleaning it out is not easy...