Hi guys, looking for a bit advice. A pal of mine was having problems with his central heating. Basically the flow pipe from the boiler and to all the rads was getting hot but the radiators would only get lukewarm. the return pipe did not seem to be getting hot at all. He ssuspected that there mat be a blockage and flushed the pipes. water seemed to flow through o.k. After reading the manual he suspected that the problem could posssibly be the diverter valve and stripped that out and that's where we became stuck. There appears to be a valve at one end that is not quite touching it's seat. Not having seen inside a diverter valve before we don't know if this is quite right. could anyone give us some clues. Would a faulty diverter valve give the symptoms I've described. Hot water is o.k. by the way. Thanks in anticipation.