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potterton envoy 40 fault code P is it a PCB fault?

had a new gas valve fitted to a potterton envoy 40 boiler it ran for a few days but now has a fault code P and will not reset
terry thompson, January 2009
installation manual says wiring fault, live on neutral connection.

andy bishop owner of manual, April 2009
link Click here to see other fixes for Potterton.