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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 Linea 28.