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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
GreenstarHeating, Home Heating SystemsReduce Boiler Pressure
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

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