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The steam doesn't subside so I have to turn off the system altogether. The blockage was removed by unrolling a reel of solder down the pipe to reach the blockage. The pump is situated adjacent to the imersion tank and the feed from the pump down to the boiler has a bad kink in it just below...

I have recently replaced the pump on my system which is fired by a Potterton Flamingo 50 boiler but after 3 or 4 minutes of firing up there is a loud surge of hot water shooting up the pipe into the small expansion tank in the roof followed by bellowing steam. There was a blockage in the system...