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I take it that this is a simliar process to bleeding radiators of air. On the pump there is a screw the size of ten pence, is this the bled screw?

What is the bleed screw and what is bleeding the high points? I am not familiar with CH systems?

If the head tank is the small overflow tank above the boiler then there is water in tank. I can see that the water is above the pipe at the bottom of the tank. Pressing down on the "ball" valve , more water enters the tank. So there is water getting to the head tank. When I turn the...

No Hot water and CH. Boiler will not switch on. Noise coming from pump, I think. Noise sounds like it is coming from heating system overflow tank. I think this is due to the sound being transmitted from the pump, along the pipe. Switching boiler off then on, does not start the gas boiler. No...