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my ferrolli f77 popular?

My boiler swithces on and off intermittently, you can haer it going on and off .Is it a pressure problem or something else.Any ideas?
Mohammed Hussain, March 2006
I had this type of problem which was traced to a faulty frost thermostat

Ian Orme, March 2006
link Click here to see other fixes for Ferroli F77.