boiler pressure

[carpnet]

Have a problem with the pressure on my combi boiler (bosch royal worcester 24i ) pressure needle is at 3.5 bar and sometimes the boiler trips itself off and has to be re set . Any help or advice much appreciated as i dont know anything about boilers thanks

 

[leakylea]

the pressure is way too high! it sounds like your filling loop is still connected and is open,this would over fill your boiler causing it to activate your pressure relief valve and boiler will not work again until the pressure has again built up,
Set pressure at 1 or 1.5 bar and remove the filling loop if it contiues to rise it may be your expansion vessle is in need of repressurising.or replacement. if water comes out of vessle when the valve on top is pressed (like on a car) the vessle requires replacement.