Pressure rise?

Either filling loop letting by or faulty expansion vessel

Sutdog
November 2013

Built into the boiler is an oblong expansion vessel,there is an air valve that should be accessible,open pressure relief valve to drop the pressure in the central heating system,then check the air pressure in the expansion vessel
as you would a car tyre then if needed pump up to 1.0 bar If pressure starts to increase again when its running the expansion vessel could need replacing

toptrish
November 2013