hello david, ideally need the model of your ferroli and i can tell you what to disconnect, unfortunatly there is different connections on the boiler dependant on model, go to ferroli.com and go to downloads, find your boiler in the list and try following the wiring diagram in installation and serviving manual, it could be as easy as taking 2 black leads out from under boiler and putting a link in ( link is small piece of wire ) between 2 points.. if you get no joy. message again with model and i'l explain how. good luck
alan, December 2010
