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Vokera option combi boiler seems to increase in pressure until it opens the safety vave ,only when heating is on !

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During the heating on pressue cross the red line

Posted on Dec 24, 2010

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Check to see if the expansion tank is completely full of water or isolated from the rest for the system. If full it needs replacing, if isolated (valve turned off to it) then turn it on. When a hot water heating system cannot allow for expansion then the pressure will increase when running until the saftey opens.

Posted on Nov 26, 2008

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