we have a combi boiler and we have just turned the hot tap on and the boiler is making an awful clunking and banging noise..there is also a hissing noise with black steam coming out of the top....any ideas?

samc, March 2009

hi you might want to check your pump is running properly set boiler a way and place screwdriver on pump listen to it by placeing ear on other end you should hear pump running,if not that it sounds like you want system cleaning out with sentinal sludge remover

skippy, March 2009