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Thanks all, for your advice. But the boiler is quite old and don't really want to pay an engineer to repair if it can be helped. So I'm going to give it a go. Probably has just perished o'rings, but to do this the DV will have to be removed, so I may as well replace the complete DV whilst...

Some advice please ! Noticed an intermittent leak from Ravenheat RSF 820/20 boiler, and after taking the front cover off located the leak. There was a trickle from the diverter valve. For someone with no boiler experience, is it advisable to attempt changing the diverter valve myself or get...