hi there i had a problem with my hot water, on my ideal responce 120 combi boiler i diagnosed it . i replaced the flow switch , to do so i had tro remove the pump. anyway when i put it all back together no leaks, i presurised the system to 1.5 bar, however when i turned the boiler on it fired up ok and was running well , but the pressure gage went us and made a LOT noise, then hot steam came out of the top, through the air vent, then the boiler shut down . the temp gage went , back down i tried it several times the same thing keeps on happening . its somthing to do with pressure build up, it didnt happen before its been ok for three years, does anyone know how to fix it please thanks joe

joe, May 2011