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i haven't checked the expansion vessel for air charge how do i do this ? its an ariston hot water tank with a varem12ltr expansion vessel. the discharge in the tundish is cold

hi can anyone help. i have an unvented hot water system and there is water trickling through the tundish. i have changed the temperature/pressure valve and the pressure relief valve cartridge but the water is still there could this be to do with the pressure reducing valve? any help greatly...