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Thanks for all of your suggestions, answers follow; corgiman - I do have water in the header tank, its mucky from venting the hot water. The ball valve is operating, when I push it down water comes out and water is not getting as high as the overflow. ollski - no offence taken, the pump went...

Can anyone help! I have a Potterton Neataheat Profile 60E boiler, Grundfoss UPS 15/50 pump and Honeywell V4073A1039 3 position valve. This morning the pump was making nasty screeching noises so I turned the pump speed down to a minimum. This caused the radiators to go cold so, suspecting the...