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I'm afraid the problem has recurred but I think I know what is happening. For some reason the water is not flowing freely and therefore the return (which determines whether the boiler cuts out) is not getting to temperature so the boiler keeps heating. When it eventually forces its way through...

The Boiler thermostat seems ok because the boiler is cutting in and out. Turned the system off yesterday, and today turned the boiler temperature down (from 70 to 60 - it won't go any lower), and also opened the valves fully on the towel rail - and the noise etc. didn't happen! Header tank...

Thanks The hot water cylinder works on gravity - there are no motorised valves. There is a pump for the heating but that is a separate circuit from the same boiler (although hot water is convecting up this circuit to the upstairs radiators and sometimes when the noise is going on the...

I have an oil-fired boiler (Camray 2, old but working well) which serves an indirect hot water system and central heating. The heating is not at the moment just the hot water.The hot water system also serves two towel rails.One is turned off. when the boiler is on the pipe going to the...