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Have just had Ferroli 40/60 wall hung fitted, converted pipework to pumped c/h and H/w. All was well until last night when once c/h warmed up the pump seems to be struggling to pull water from boiler and making clanging noise and shaking and bolier starts chugging and fizzing noise as though...

Any help with this one greatfully received. On my c/h h/w pump I stupidly unscrewed the large crome screw on the back end of the pump a little water leaked out, at which point I retightened the screw- now I am concerned I have over tighted it, is this possible??? should it be done as tight as...