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Anyone any ideas if this is straight forward? Pipework is ols half inch imperial but valves are jammed shut and need swapping I have heard of "green rings", is this some conversion olive? Any help would be appreciated

Hi, got called to a job last week to a 105e, safety valve dripping-Pressure was at just under 3 bar. released pressure to 1.2bar. disconnected filling loop. heating/hot water ok when I left.The customer claimed to have "fiddled with it" before I got there A day later pressure back up to...

I have a fault on a combi that is tripping the overheat on the top of boiler on occasions when heating's on and hot water is run, generally when taking a shower. Checked the overheat stat and seems ok tho haven't replaced it. Does not trip if heating called for OR hot water demand called for...