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keston Q28 losing pressure?

3year old installation.Dripping prv replaced but still drips on pressure of 1.5-2.0 bar.new prv 3bar .No leaks Or blockages,condensate outlet ok.
john, March 2012
Pressure vessel lost Air need recharging ,look in manual for rating ,empty system pump it with cycle pump,refit take air from rads

ltd, March 2012