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After taking out the 3 valve internals I sussed it was siezed - I've freed it and will see if it works - unfortunately the pump appears knackered as well - I've taken it out and when you turn the end screw their is a grating noise. I suspect that when I;ve been pressing the screw in to...

The black knob on the front was actually a dust cover - onve removed their is a sprung screw which connects with the pump - which is turning. I can also turn the pump by, hand using the screw (shwn power to the pump is off). Now have 3 upstairs and 2 downstairs rads working - no luck on other...

See photo - instead their is a serrated cap - I've slowly unscrewed it but a lot of water started coming out - so it looks as though i may have to bleed it down and remove it - unless anyone knows what to do with this type of pump.

Thanks picasso - Will check tonight.[/img]

Hi All. Under pressure from the wife I fired up the central heating yesterday evening (why - it's only September!) for the first time since last winter. Unfortunately the majority of the radiators haven;t come on, only the three nearest the boiler (I suspect due to heat conduction as opposed...