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For what it is worth, my problem has just been fixed having done the same type of change of radiator thing, by running the pump with the plug out. Although water was coming out when bleeding, it seems not to have been running right. I isolated either side of the pump, took the plug out...

Thanks for the amazingly prompt reply. You are quite right. The pump with the plug out is now turning fine, and all is coming back on line. I guess it was blocked/stalled or something. I didn't realise that you could run it with the plug out to see what was happening. :oops: Is this a...

I've been looking at the various posts and notes around this forum to try to answer this, but am still struggling. So any help would be greatly appreciated. Boiler is a Potterton Profile 60e Pump is Grundfos UPS 15-90 MV's are Drayton 2 port units (2 off) I removed and refitted a...

Image of Hot Water tank with pump, 2 MV's, and two other valves.