Got Baxi combi boiler 133HD installed about three years ago. The hot water goes to cold water when using shower and the reset light starts flashing on the system. It does not rectify when I press the rest button which keep flashing. But if I do not use the system for a while and press reset button again it works well for a while before repeating the above fault

S.S Marwa, November 2009

sounds like a over heat fault, not sure whats on these but for example if a hot water sensor was faulty then it might tell the boiler to keep full gas to burners thinking its still cold resulting in the boiler tripping out on overheat, or it could be the other way and already thinks the waters red hot and shuts down for safety. shouldnt be something too serious

ste, November 2009