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Ferroli Combi boiler CH loosing pressure why?

My Domina 102 Ferroli boiler has suddenly started to loose presure on the CH I am recharging 3 x a day now. Am I loosing CH fluid or is it a pressure valve. I have just had a new radiator added but we cant find any seepage.
Steve Eastbourne
Steve Evans, March 2007
poss expansion vessel

g lloyd, March 2007
No I checked last night ran the system several times ( and re pressurised it several times ) No water came out of the overflo.

Steve Evans, March 2007
is the prv leaking, ( thats the overflow pipe going out the wall from the boiler )

hi-spec plumbing, March 2007
link Click here to see other fixes for Ferroli.