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how to reduce boiler pressure ?

i have set the bar pressure on my greenstar 37 cdi to high. how do I reduce it to proper level. Do I use the key to let water out or do I have to bleed radiators?
fred, April 2017
Just bleed one of the radiators, check the rad valve at the bottom is fully open. May take a little while, but nice and easy,

Rupert, May 2017
link Click here to see other fixes for Greenstar.