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biasi 24s loses water?

hi, my biasi 24s, set at 1bar pressure,loses water through the outlet pipe on c.h. the pressure rises to nearly 4bar, then when i stop the c.h. it will drop down to 0bar, but i can still get c.h & d.h.w.
any ideas please.
den, January 2012
change pressure relief valve, also pressure vessel need pump see value on vessel,to do this need to drain out system

ltd, January 2012