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How cam i get down to 1.5 bar?

I have a volkera linea 24 combi system, at the moment the bar is on 3 to 3.5, i have tried to bleed from cold down to 1.5 but when i fire back up it back up to 3 to 3.5, what am i doing wrong.
Paul Powell, October 2009
A1

Thanks

Paul Powell, October 2009
you set the bar pressure cold to 1.5bar and then when it gets hot in use goes up to 3bar ish.when it cools down should go back down to 1.5bar

a1, October 2009