We have a potterton performa 24 which has been installed for about 4 years (very little use until 2 years ago). It has a slight intermittent leak (a greenish deposit) which comes from the joint between the 2 halves of the diverter valve assembly. Is there an 'O' ring or some other type of seal athis joint and is there a part number to order thhis item?
It should be quite easy to remove the DHW pressure diff. valve at this connection. The boiler is wall mounted, higher than the rads; if I turn off the cold waater inlet can I easily drain this into a bowl at the connection directly below the valve?
Any advice appreciated.

Thanks

John.

John bunting, November 2007

read the manual it tells you how to, if you dont have them then look on ebay under boiler manuals

ppan, November 2007