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I actually expected him to at least try a few tests.or even break open his tool box,not just condemn the uninsured item,as I understand when these systems fail the pressure goes so you can't restore the bubble,it's definitely pulling air in from somewhere cud the tank or ball clock be faulting?

I have a back back boiler with the dreaded primatic cylinder,it hasn't really caused a problem til lately,it was covered with British gas(pipes and boiler cover) they wouldnt cover primatic cylinder.hot water is fine ,central heating not working,the first radiator in line would get hot,the...