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What is required to fix this?

My vokera combi boiler pressure is continuing to rise even when the filling loop is removed. I cannot use the central heating as the pressure rises quickly after 15mins. What is wrong?
Sheena McGartland, October 2010
If it's rising when the heating is on, the expansion vessel needs recharging/replacing.

If it's rising anyway with everything off, the domestic heat exchanger must be 'mixing' and would need renewing.

Carefree, October 2010
link Click here to see other fixes for Vokera.