The flange between the water supply pipe and the circulation pump has a small leak on the feed side.How can i repair this,i have tried nipping up the locating screw with no success.Do i need to drain the system to separate the flange,and if separated is a new gasket required,if not how is it sealed?
The pump is a Grundfos type:-UP 15-60-AO

craig, June 2006

you will most likely need a new 'o' ring, im sure thats the seal on that flange, as your boiler is a combi so its a pretty straight forward job to isolate the flow and returns no the boiler via the valves underneath, drain the boiler and replace the 'o' ring

Hope this information helps

Lja, June 2006