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:lol: Hi Namsag, Huge thanks for your input. What you say about the cold feed certainly seems to fit. Again, many thanks. Best wishes, xoroir

Hi Rob77. I, too, have similar problems to yours. i.e. bubbling, gurgling pipes; sludge in the system; gurgling when switching on system and when using hot water; or switching off. No sign of any leaks and the system has previously worked impeccably. New pump and boiler approx four years ago...

I have an old system but a boiler and pump approx. four years old. During its life, the system has worked perfectly until a few weeks back when the water began bubbling loudly through the pipes and I noticed one or more radiators were unevenly warm. I have vented regularly but found now that...