I have the above, in the loft, in a bungalow. Fitted Jan 02 it has been ok. Recently when it fired it sounded like an army tank then settled and later I noticed water in drive from overflow. This occurs regularly now. Later in evening heard dripping. This was from joint just below a brass pressure valve?. Loft very wet but no real damage. Joint tightened and valve has been replaced but it still overflows regularly. My engineer away at moment. Any suggestions as to likely cause appreciated.
