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Just to say have fixed this problem. Released excess pressure via stopcock under boiler. Now whirring and heating away quite merrily.

Would be grateful of any advice. I see a very recent similar post which refers to gas not firing .. my problem might be the same?? Haven't ever (yet) taken case off .. can't see an auto air vent but there's two big screws on top stickered AIR and FLUE. Haven't touched them. Here's my problem -...