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Water leaking from on Potterton Performa 28 diverter valve?

Water is leaking from the push rod seal at the front of the diverter valve. The push rod operates a microswitch.Do I need to buy a new diaphram or is there another possible cause i.e. maybe an "O" ring behind the brass nut at the front of the diverter valve.Thanks.
Jeff, April 2005
you need a replacement DHW flow valve part.. Potterton 248063 Manifold (MF01) around £58 incl VAT

wiggy, April 2008
It certainly wont be the diaphragm it will be an o ring

steve, April 2005
go to the potterton site and check for a parts diagram

aa, April 2005
link Click here to see other fixes for Potterton.