MYSON APOLLO FANFARE 30/5051 With water only - very noisy (like an aeroplane slowing down) each time gas goes off... Now - with water and heating - humming noise but boiler does not come on. Recently serviced and I was told that the noise was OK - just an indication that the fan was wearing out but nothing to worry about. Your advice would be appreciated so that I know what I'm talking about when I recall the Boiler Company. Many thanks Julie Massey