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Thanks for your reply. Perhaps the wrong term, but it sounds like boiling coming from the attic - by your defintion soulds like it could apply to boiling water/steam in the vent pipe? Appreciate a pump over run would help, but it doesn't resolve the underlying issue (which I believe there is as...

Hi, I have an old Potterton Kingfisher 2 RS100. I think it may be overheating as I can sometimes hear what I think is kettling in the expansion tank. As it's an old big boiler there's no pump overrun or auto-bypass (as I understand it it is able to dissipate the heat safely itself after the...