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sorry i had to remave the valves from the main pipe work as they were stuck onto the pump to tight to work on them in place so didnt have to close them in first place.

If you mean isolation valves there wernt any had to drain the system completely just to get the old pump off

ohh forgot to mention that the expansion tank is filling up with hot water from the system every time the banging occurs

banging, cant remeber the name of boiler will find out tommorow when im passing the place

yes turned off at fuse just to make sure

Erm wow loads of help thanks everyone,, The reason I think it sucking in air is the noise and whenever I have to shut the system off because the knocking is so violent after a few hours of running. I can bleed the highest radiator for about 5 mins then leave for an hour then have to do...

Hi there my plunmber mate hasnt got time hes sflat out constantly and he is just as tumped which is why he said just turn it into sealed system. Cost is a slight factor but if needs must we will get another plumber in but if anything it has me intriguid as to why after 13 years of working...

Thanks for that will try it when I get home tonight didnt even crossd my mind to turn the bloody thing down after i fitted it, cheers again.

Hi my mother in law has an open vented system running three radiators no hot water. the pipes froze and split last winter and as it is holiday cottage i didn't notice till the pump hads burnt out i replaced the pipes and the pump (my friend a plumber came and checked it was all alright). It...