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Vokera linea 28 excessive water pressure build up when central heating?

When the central heating temperature is switched up high ie 55 degrees+ the water pressure climbs to 3 bar or more. What could be the cause of this? How difficult/ expensive to fix it?
Thank you
Peter E, November 2009
had the same problem check the braded pipe from the expansion vessel might be blocked

or the Flow Diaphragm got a split in it if its dropping down and you are gettin the 40 code hope this helps

Ice-Man, December 2009
:-)

ste, November 2009
thats what i said

b, November 2009
however if the pressure vessel not working you will need a replacement and could be a bit more expensive to replace get a professional in

max, November 2009
pressure on the expansion vessel needs checking
or expansion vessel may need replacing

b, November 2009
link Click here to see other fixes for Vokera.