A
ansell0
hi all need some help please, i had a new boiler fitted on the cheap and it seems like the bloke who done it never flushed or cleaned the system first. now ive had to take the secondary h/exchange out 4 times now to clean it because it keeps getting blocked with little black bits?? rust??? whatever it is and stopping my dhw getting hot it was fine at first then kept getting less hot until virtualy lukewarm until i clean the h/e out then its red hot again .can anyone advise me please..