there is a return filter fitted inside the nut on the jig /pipe connections //to do this and check for debris and sludge you need to isolate the 2 black taps under boiler black tap furtherst left and black tap furtherst right inside the boiler to the right of the pump is a small white wheel valve open up and drain boiler into bucket underneath you will get about a 5th of a bucket then when water stops undo the silver 1/2 " nut on the return pipe this is found above the right hand black tap you have isolated it sits facin you underneath remove and check for crap // when complete refit open taps and re pressure to 1.5 bar
tony
January 2010
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