Hello All, I am a newbie as far as making a posting is concerned, but I have followed this forum for a few years now, not so much for plumbing info but for the humour! It can be a bit ripe sometimes, so please be gentle with me! Down to business... My old Combi is playing up again (been OK since I replaced the diverter valve complete 3 years ago), not for the usual failed diaphragm, but for a small leak behind the diaphragm chamber. Having said that the symptoms are the same ie; central heating OK but no DHW. I jumped in armed with a Giannoni diaphragm only to find the old one was in reasonable condition. I fitted the new one whilst I was at it anyway only to find no improvement. After some head scratching I can see that the new spindle is not as far out as it should be in CH position, and therefore does not reach the micro switches when a hot tap is turned on (just like a defective diaphragm!). The domestic cold water pressure is good (the hot water tap pressure when on is just about equal to the cold. I have a nagging doubt about generic replacement parts quality (BES LTD were my source for the valve complete). Have I missed something obvious? Can some kind soul point me in the right direction please? regards, boydell.