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how to lower pressure on vokera boiler?

my boiler is on 2 bars and about after 2 hours its been on the boiler start vibratting and have to turn heating off i need to knw how to lower pressure t 1 1/2 bars i know how to make the pressure go up but not down please help.
mr smith, February 2007
since I have been knew to these boilers during the
last two months, is it by turning the black button
clockwise?

Abdul Hye, November 2008
just release some out of a radiator bleed valve, hold a dish under valve and open till pressure drops you can always top it up if you go to low.

hi-spec plumbing, February 2007
link Click here to see other fixes for Vokera.