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Mend Ferroli Optima 901 Boiler Heating Pressure Loss

I have a ferroli optima 901 which keeps loosing presure?

It keeps loosing presure through the prv , I have renewed the prv and still loosing presure any ideas please

Dave L
December 2010
Probable expansion vessel issue, needs recharging/replacing

Carefree
December 2010

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