I have a vaillant boiler ecotec pro 28 ( it is new, 1 year only, installed last year by britih gas ). The dial in the pressure gauge crossed the grey area and nealy touched the red area. I was worried and switched off the boiler. It was on timer.It has now returned to normal ( half-way in the grey area). I amd worried the same thing may happen tomorrow when it is on timer.
Please advice course of action !

Ramesh Rajput, January 2012

No need to worry you can take out some water from air vent to 1.2 bar ,when temp high pressure will go high,if for reason pressure pass red mark water will be out through pressure relif safety valve ,if some resason pressure going high pressure vessel need attention

ltd, January 2012