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The only automated valve is the valve that diverts the boiler water to the radiators or the hotwater tank. This is controlled by the strap on thermostat on the hotwater tank

Ok i'll try that but here's some more info If I adjust the speed of the CH pump while the humming is occurring the humming changes pitch Its a higher pitch with the higher pump speed. If i turn the hot water tank thermostat up while the noise is there it disapears ie i divert the the...

The boiler is a Glowworm Fuel saver MkII It's not a Combi boiler I suspected the pump a year or so ago but replacing it didnt really help and the noise seems to stay the same on the high or medium speed setting

If this is the case whats the easiest way to fix it? thanks

Hi Guys I hope someone can help me with this boiler noise. Everytime my boiler gets close to the cut off temp on the main boiler thermostat it starts making a noise like an airliner going past until it cuts off. When the boiler fires up again it runs for a couple of minutes without the...