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I posted a problem with an ariston microsystem 21 condensing boiler failing to ignite now it seems to have gained a new problem.If the boiler is off on the timer the pressure stays at 1.5 bar as soon as the heating comes on the presure goes up to around 2-2.5 and carries on rising, after about...

I`ve seen something very similar i think it was crosswater

Had this problem ever since the boiler was installed(about 3years ago),i had a plumber in who raised the gas pressure and the problem was solved for about 2 months then started again intermittently.The boiler pressure is fine, it starts to spark then doesn`t seem to fire up quick enough and...