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OK - all sorted. A replacement diverter valve worked perfectly - no weeping whatsoever. For reference, this particular copy valve was branded Banico (DVD-E3) made in Manchester by Banico Controls. A more expensive replacement valve is also available under the Giannoni brand name...

Thanks for the input guys. The grub screw is tight, and doesnt make any difference what I do with it. It was a relatively low cost valve, because we were told that the original part was superceeded, and that in turn, was no longer available. I think it's got to go back. :(

I replaced the complete valve. It's a strange co-incidence if both the old and new valve leak from the same spot ! :-)

Hi folks, I had a leaky diverter valve, it kept weeping from 4 small holes located half way up the main body of the valve. Assuming this to be a problem, I got a replacement and put it in yesterday. However, I've noticed that it's weeping from the same holes as on the original one (not...

Hi ! Asking this on behalf of my sister. She's decided to have a new boiler to replace her totally knackered 30 year old heap. New boiler will be a WB combi, and she's had a number of quotes for the work. Every fitter has quoted for a new boiler, new rads etc, but only half of them...

Hi ! Many thanks for the replies. I definately followed the instructions properly, as I have the original installation manual here. It says pump 0.5 bar of air into the pressure vessel, then top up with water till the meter reads 1.5 bar. The water seepage doesn't occur into the system...

Hi folks, Could do with some advice about our 15 year old Worcester 9.24 Electronic combi. For several months now, we've been losing pressure (as indicated by the dial on the front). Usually it drops overnight or during the day when the boiler is not in use. We've been topping it up...