I have a Ferroli 77ff GC No 47 267 04, which does not light up on hot water or heating. I have traced it to the air pressure switch which seems to be sticking. The new switch I put in does not work and is set at 47Pa, but the one I took out was set for 43Pa. I checked and cleaned the one taken out and tryed this again and it is now working o.k. Does anyone know what the correct one is, and would the 4 Pa make a difference. I have checked with other shops and the internet shops are 43Pa and the local dealers are 47Pa.
Thanks for any help
Thanks for any help