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boiler fails?

mt ferroli boiler fails occasionally there is no fault code apart from a drip from the dhw there are no taps open in the house i have changed the flow sensor but still no luck
bob barrell, January 2012
Check the pressure, should be about 1 bar, fill up if need be. Other than that model etc etc would help

SD, January 2012
link Click here to see other fixes for Ferroli.