The instant hot water from my gas boiler cycles from hot to cold. If I turn on the tap the gas comes on, temperature of water goes up, as shown by the bar graph in the front of the boiler and hand on the hot water pipe, then there is a click and boiler goes off for about 20S. I think and the gas jet is not modulating and the over heat thermostate is cutting of the gas, however if I turn the water temperature down to half way it seems to work OK, could the water overheat thermastate be faulty? The bar graph on the front of the boiler is only getting up to
40 degress before gas cut off, I remember it going to 50/60 degress when running correctly. Any advice?- posted
16 years ago