Drain system,switch power off,shut main water supply to boiler undo four stud or screw bolt ,undo screw holding pump,it's under the the pump,undo return Cooper 22mm pipe,easy to pull out diverter valve,pull out long clip holding to pump than pull out diverter from pump,it will bit tight ,when replacing new one change all ORings and washer on hot water heat exchanger,apply light fairy liquid when assembly with pump,when in place special washer is tight fit on heat exchanger,tool you need is star type long key to fit bolt,
ltd
March 2012