My boiler has been losing pressure for some time. Water comes out the pressure relief valve outlet when the central heating is on. Do I need to re-place the low water pressure siwtch or is it the expansion vessel that's faulty?
i had a problem with my ferolli f30b and no heating engineers had a clue, i called the ferolli tech department on 0871 559 2927 and they diagnosed my problem in 2 minutes.
steve smith, January 2010
Pressure relief valve defective if system pressure set at 1 bar
