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central heating not working?

hot water is working but central heating not comming on.have replaced room thermostat.boiler is ferroli 77 ff
stuart brunton, October 2008
I have exactly the same problem and exactly the same boiler. I am looking for an answer but have so far been unlucky. If I work it out i'll post it here. If you work it out via another source please put the result on here. Ferroli (tut)

Phil Sanderson, November 2008
link Click here to see other fixes for Ferroli 77 FF.