Could anybody help me, my boiler is only 12 months old and has just started to make noises as if there is a air blocked but it is in the boiler its self and i was told it cant be because it is air tight but it keeps banging inside and then the reset button starts to flash and the blue on button is flashing to at about every four seconds and the manual says there is a reset button which i have pressed but to no joy it is still doing it can anyone help please with some advise. Many Thanks Pamela.